Datenblatt für BQ24072T, 75T, 79T

Datenblatt - Kommentare/Fehler melden

1!. B X E I TEXAS INSTRUMENTS

VSS

BAT

GND

Adaptor

BQ24075T

BQ24079T

BQ24072T

OUT

CHG

PGOOD

TRM

EN1

EN2

ILIM ISET

TEMP

PACK-

SYSTEM

SYSOFF

System

ON /OFF

Control

1PF

4.7 PF

1 k:

1.18 k:

1 k:

10 k:

1.13 k:

13 k:

VIN

12 16 14

PACK+

Product

Folder

Order

Now

Technical

Documents

Tools &

Software

Support &

Community

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

BQ24072T

BQ24075T

BQ24079T

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

BQ2407xT Standalone 1-Cell 1.5-A Linear Battery Charger with Power Path and

Voltage-Based TS

1 Features

1• Fully Compliant USB Charger

• Selectable 100 mA and 500 mA maximum input

current

• 100 mA Maximum current limit ensures

compliance to USB-IF standard

• Input based dynamic power management (VIN-DPM)

for protection against poor USB sources

• 28 V Input lting with over-voltage protection

• Integrated dynamic power path management

(DPPM) function simultaneously and

independently powers the system and charges the

battery

• System output tracks battery voltage (BQ24072T)

• Supports up to 1.5 A charge current with current

monitoring output (ISET)

• Programmable Input Current Limit up to 1.5 A for

wall adapters

• Battery disconnect function with SYSOFF input

• Reverse current, short-circuit and thermal

protection

• Flexible voltage based NTC thermistor input

• Proprietary start up sequence limits inrush current

• Status indication – charging/done, power good

• Small 3 mm × 3 mm 16 Lead VQFN Package

2 Applications

•Smart phones

•PDAs

•MP3 players

•Low-power handheld devices

3 Description

The BQ2407xT series of devices are integrated Li-ion

linear chargers and system power path management

devices targeted at space-limited portable

applications. The devices operate from either a USB

port or AC adapter and support charge currents up to

1.5A. The input voltage range with input over-voltage

protection supports unregulated adapters. The USB

input current limit accuracy and start up sequence

allow the BQ2407xT to meet USB-IF inrush current

specification. Additionally, the input dynamic power

management (VIN - DPM) prevents the charger from

crashing incorrectly configure USB sources.

The BQ2407xT features dynamic power path

management (DPPM) that powers the system while

simultaneously and independently charging the

battery. The DPPM circuit reduces the charge current

when the input current limit causes the system output

to fall to the DPPM threshold; thus, supplying the

system load at all times while monitoring the charge

current separately. This feature reduces the number

of charge and discharge cycles on the battery, allows

for proper charge termination and enables the system

to run with a defective or absent battery pack.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)

BQ24072T

VQFN (16) 3.00 mm x 3.00 mmBQ24075T

BQ24079T

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Simplified Circuit

l TEXAS INSTRUMENTS

BQ24072T

BQ24075T

BQ24079T

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

www.ti.com

Product Folder Links: BQ24072T BQ24075T BQ24079T

Table of Contents

1 Features.................................................................. 1

2 Applications ........................................................... 1

3 Description ............................................................. 1

4 Revision History..................................................... 2

5 Description (continued)......................................... 3

6 Device Options....................................................... 3

7 Pin Configuration and Functions......................... 4

8 Specifications......................................................... 6

8.1 Absolute Maximum Ratings ..................................... 6

8.2 ESD Ratings.............................................................. 6

8.3 Recommended Operating Conditions....................... 6

8.4 Thermal Information.................................................. 7

8.5 Electrical Characteristics........................................... 7

8.6 Typical Characteristics............................................ 10

9 Detailed Description............................................ 13

9.1 Overview ................................................................. 13

9.2 Functional Block Diagram....................................... 13

9.3 Feature Description................................................. 14

9.4 Device Functional Modes........................................ 20

10 Applications and Implementation...................... 25

10.1 Application Information.......................................... 25

10.2 Typical Applications .............................................. 25

11 Power Supply Recommendations ..................... 31

11.1 Power On .............................................................. 31

12 Layout................................................................... 33

12.1 Layout Guidelines ................................................. 33

12.2 Layout Example .................................................... 33

12.3 Thermal Package.................................................. 34

13 Device and Documentation Support ................. 35

13.1 Device Support .................................................... 35

13.2 Related Links ........................................................ 35

13.3 Receiving Notification of Documentation Updates 35

13.4 Support Resources ............................................... 35

13.5 Trademarks........................................................... 35

13.6 Electrostatic Discharge Caution............................ 35

13.7 Glossary................................................................ 35

14 Mechanical, Packaging, and Orderable

Information ........................................................... 35

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision B (November 2014) to Revision C Page

• Changed the data sheet title ................................................................................................................................................. 1

• Moved Storage temperature From: the ESD table to the Absolute Maximum Ratings.......................................................... 6

• Changed the Handling Ratings table to ESD Ratings............................................................................................................ 6

• Changed VIN-LOW To: IN-DPM in the Electrical Characteristics Power Path section ................................................................... 7

• Changed VIN-LOW To VIN-DPM in the Functional Block Diagram ............................................................................................. 13

• Changed: "R3 must be added.." To: "R8 must be added..." in the Battery Pack Temperature Monitoring section............. 20

• Changed R6 From: 10 kΩTo: 19.1 kΩand R7 From: 13.2 kΩTo: 8.25 kΩin Figure 23 .................................................. 25

• Changed text: "which for this case are R6 = 8.25 kΩand R7 = 19.1kΩ.." To: "which for this case are R7 = 8.25 kΩ

and R6 = 19.1 kΩ"................................................................................................................................................................ 26

• Changed Equation 8 ............................................................................................................................................................ 34

Changes from Revision A (April 2010) to Revision B Page

• Added Handling Rating table, Feature Description section, Device Functional Modes, Application and

Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation

Support section, and Mechanical, Packaging, and Orderable Information section................................................................ 1

• Deleted text from the Pin Configuration and Functions section: "Pin out designations are not final. Subject to

change." ................................................................................................................................................................................. 4

• Changed VO(REG) to VBAT(REG) in Min Typ Max columns on the VRCH spec. of Electrical Characteristics table under

sub section BATTERY CHARGER......................................................................................................................................... 8

• Changed IOUT 5.5 V To VOUT 5.5 V in Figure 28 .................................................................................................................. 27

l TEXAS INSTRUMENTS

BQ24072T

BQ24075T

BQ24079T

www.ti.com

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

Product Folder Links: BQ24072T BQ24075T BQ24079T

Changes from Original (December 2009) to Revision A Page

• Added BQ24072T device to data sheet header..................................................................................................................... 1

• Added BQ24072T feature bullet............................................................................................................................................. 1

• Added "BQ24072T" to graphic entity...................................................................................................................................... 1

• Added BQ24072T spec. to Ordering Info table...................................................................................................................... 3

• Added BQ24072T Pin Diagram.............................................................................................................................................. 4

• Added BQ24072T to VO(REG) in the Electrical Characteristics Power Path section................................................................ 7

• Added "BQ24072T" to VDPPM in the Electrical Characteristics table....................................................................................... 8

• Added "BQ24072T" to VBAT(REG) the Electrical Characteristics table...................................................................................... 8

• Added BQ24072T Termination Disable (TD) description..................................................................................................... 17

• Added graphic entity for BQ24072T DPPM and Battery Supplement Modes...................................................................... 23

• Added graphic entity for BQ24072T Host Controlled Charger application........................................................................... 29

• Added Termination Disable operation procedure................................................................................................................. 29

5 Description (continued)

Additionally, the regulated system input enables instant system turn-on when plugged in even with a totally

discharged battery. The power-path management architecture also permits the battery to supplement the system

current requirements when the adapter cannot deliver the peak system currents, enabling the use of a smaller

adapter.

The battery is charged in three phases: conditioning, constant current, and constant voltage. In all charge

phases, an internal control loop monitors the IC junction temperature and reduces the charge current if the

internal temperature threshold is exceeded. The charger power stage and charge current sense functions are

fully integrated. The charger function has high accuracy current and voltage regulation loops, charge status

display, and charge termination. The input current limit and charge current are programmable using external

resistors.

6 Device Options

PART NO. VOVP VBAT(REG) VOUT(REG) VDPPM OPTIONAL

FUNCTION

BQ24072TRGTR 6.6 V 4.2 V VBAT + 225 mV VOREG –100 mV TD

BQ24072TRGTT 6.6 V 4.2 V VBAT + 225 mV VOREG –100 mV TD

BQ24075TRGTR 6.6 V 4.2 V 5.5 V 4.3 V SYSOFF

BQ24075TRGTT 6.6 V 4.2 V 5.5 V 4.3 V SYSOFF

BQ24079TRGTR 6.6 V 4.1 V 5.5 V 4.3 V SYSOFF

BQ24079TRGTT 6.6 V 4.1 V 5.5 V 4.3 V SYSOFF

‘5‘ TEXAS INSTRUMENTS

16 ISET5EN2

1TS 12 ILIM

15 SYSOFF6EN1

2BAT 11 OUT

14 TMR7PGOOD

3BAT 10 OUT

13 IN8VSS

4CE 9 CHG

No t to scale

Th ermal

Pad

16 ISET5EN2

1TS 12 ILIM

15 TD6EN1

2BAT 11 OUT

14 TMR7PGOOD

3BAT 10 OUT

13 IN8VSS

4CE 9 CHG

No t to scale

Th ermal

Pad

BQ24072T

BQ24075T

BQ24079T

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

www.ti.com

Product Folder Links: BQ24072T BQ24075T BQ24079T

7 Pin Configuration and Functions

BQ24072T RGT Package

QFN 16 Pin

Top View

BQ24075T and BQ24079 RGT Package

QFN 16 Pin

Top View

Pin Functions

DESCRIPTION

NAME

NUMBER

I/O

BQ24072T BQ24075T

BQ24079T

TS 1 1 I/O External NTC Thermistor Input. Connect the TS input to the center tap of a resistor divider from VIN to

GND with the NTC in parallel with the bottom resistor to monitor the NTC in the battery pack. For

applications that do not utilize the TS function, set the resistor divider to be a 20% ratio. See the Battery

Pack Temperature Monitoring section for details on calculating the resistor values.

BAT 2, 3 2, 3 I/O Charger Power Stage Output and Battery Voltage Sense Input. Connect BAT to the positive terminal of

the battery. Bypass BAT to VSS with a 4.7μF to 47μF ceramic capacitor.

CE 4 4 I Charge Enable Active-Low Input. Connect CE to a high logic level to place the battery charger in standby

mode. In standby mode, OUT is active and battery supplement mode is available. Connect /CE to a low

logic level to enable the battery charger. CE is internally pulled down with ~285kΩ. Do not leave CE

unconnected to ensure proper operation.

EN2 5 5 I Input Current Limit Configuration Inputs. Use EN1 and En2 to control the maximum input current and

enable USB compliance. See for the description of the operation states. EN1 and EN2 are internally

pulled down with ~285kΩ. Do not leave EN1 or EN2 unconnected to ensure proper operation.

EN1 6 6 I

PGOOD 7 7 O Open-Drain Power Good Status Indication Output. PGOOD pulls to VSS when a valid input source is

detected. PGOOD is high-impedance when the input power is not within specified limits. Connect

PGOOD to the desired logic voltage rail using a 1kΩto 100kΩresistor, or use with an LED for visual

indication.

VSS 8 8 – Ground. Connect to the thermal pad and to the ground rail of the circuit.

CHG 9 9 O Open-Drain Charging Status Indication Output. CHG pulls to VSS when the battery is charging. CHG is

high-impedance when charging is complete or when the charger is disabled. CHG flashes to indicate a

timer fault. Connect CHG to the desired logic voltage rail using a 1kΩto 100kΩresistor, or use with an

LED for visual indication.

OUT 10, 11 10, 11 O System Supply Output. OUT provides a regulated output when the input is below the OVP threshold and

above the regulation voltage. When the input is out of the operation range, OUT is connected to VBAT

except when SYSOFF is high. Connect OUT to the system load. Bypass OUT to VSS with a 4.7μF to

47μF ceramic capacitor.

ILIM 12 12 O Adjustable Current Limit Programming Input. Connect a 1.07kΩto 7.5kΩresistor from ILIM to VSS to

program the maximum input current (EN2=1, EN1=0). The input current includes the system load and the

battery charge current. Leaving ILIM unconnected disables all charging.

IN 13 13 I Input Power Connection. Connect IN to the external DC supply (AC adapter or USB port). The input

operating range is 4.35V to 6.6V. The input accepts voltages up to 26V without damage, but operation is

suspended. Bypass IN to VS with a 1μF to 10μF ceramic capacitor.

TMR 14 14 I Timer Programming Input. TMR controls the pre-charge and fast-charge safety timers. Connect TMR to

VSS to disable all safety timers. Connect a 18kΩto 72kΩresistor between TMR and VSS to program the

timers to a desired length. Leave TMR unconnected to set the timers to the default values.

l TEXAS INSTRUMENTS

BQ24072T

BQ24075T

BQ24079T

www.ti.com

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

Product Folder Links: BQ24072T BQ24075T BQ24079T

Pin Functions (continued)

DESCRIPTION

NAME

NUMBER

I/O

BQ24072T BQ24075T

BQ24079T

SYSOFF – 15 I System Enable Input. Connect SYSOFF high to turn off the FET connecting the battery to the system

output. When an adapter is connected, charge is also disabled. Connect SYSOFF low for normal

operation. SYSOFF is internally pulled up to VBAT through a large resistor (~5MΩ). Do not leave

SYSOFF unconnected to ensure proper operation.

TD 15 – I Termination Disable Input. Connect TD high to disable charger termination. Connect TD to VSS to

enable charger termination. TD is checked during startup only and cannot be changed during operation.

See the TD section in this datasheet for a description of the behavior when termination is disabled. TD is

internally pulled down to VSS with ~285 kΩ. Do not leave TD unconnected to ensure proper operation.

ISET 16 16 I/O Fast Charge Current Programming Input. Connect a 590 Ωto 3 kΩresistor from ISET to VSS to program

the fast charge current level. Charging is disabled if ISET is left unconnected. While charging, the voltage

ISET reflects the actual charging current and can be used to monitor charge current. See the Charge

Current Translator section of this datasheet for more details.

Thermal

Pad – -- – There is an internal electrical connection between the exposed thermal pad and the VSS pin of the

device. The thermal pad must be connected to the same potential as the VSS pin on the printed circuit

board. Do not use the thermal pad as the primary ground input for the device. VSS must be connected to

ground at all times.

Table 1. EN1/EN2 Settings

EN2 EN1 MAXIMUM INPUT CURRENT INTO IN

0 0 100 mA. USB100 mode

0 1 500 mA. USB500 mode

1 0 Set by external resistor from ILIM to VSS

1 1 Standby (USB suspend mode)

l TEXAS INSTRUMENTS

BQ24072T

BQ24075T

BQ24079T

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

www.ti.com

Product Folder Links: BQ24072T BQ24075T BQ24079T

(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings

only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating

conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2) The IC operational charging life is reduced to 20,000 hours, when charging at 1.5A and 125°C. The thermal regulation feature reduces

charge current if the IC’s junction temperature reaches 125°C; thus without a good thermal design the maximum programmed charge

current may not be reached.

8 Specifications

8.1 Absolute Maximum Ratings(1) (2)

over operating free-air temperature range (unless otherwise noted)

MIN MAX UNIT

Input voltage

IN (with respect to VSS) –0.3 28 V

BAT (with respect to VSS) –0.3 5 V

OUT, EN1, EN2, CE, TS, ISET, PGOOD, CHG, ILIM, VREF,

ITERM, SYSOFF, TD (with respect to VSS) –0.3 7 V

Input current IN 1.6 A

Output current (Continuous)

OUT 5 A

BAT (Discharge mode) 5 A

BAT (Charging mode) 1.5 A

Output sink current CHG, PGOOD 15 mA

Junction temperature, TJ–40 150 °C

Storage temperature , Tstg –65 150 °C

(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

8.2 ESD Ratings

VALUE UNIT

V(ESD) Electrostatic discharge

Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins(1) ±2000 V

Charged device model (CDM), per JEDEC specification JESD22-C101,

all pins(2) ±500 V

(1) The IC operational charging life is reduced to 20,000 hours, when charging at 1.5A and 125°C. The thermal regulation feature reduces

charge current if the IC’s junction temperature reaches 125°C; thus without a good thermal design the maximum programmed charge

current may not be reached.

(2) Use a 1% tolerance resistor RISET to avoid issues with the RISET short test when using the maximum charge current setting.

8.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

MIN MAX UNITS

VIN IN voltage range 4.35 26 V

IN operating voltage range 4.35 6.4 V

IIN Input current, IN pin 1.5 A

IOUT Current, OUT pin 4.5 A

IBAT Current, BAT pin (Discharging) 4.5 A

ICHG Current, BAT pin (Charging) 1.5(1) A

TJJunction Temperature 0 125 °C

RILIM Maximum input current programming resistor 1.07 7.5 kΩ

RISET Fast-charge current programming resistor(2) 590 3000 Ω

RITERM Termination current programming resistor 0 15 kΩ

RTMR Timer programming resistor 18 72 kΩ

l TEXAS INSTRUMENTS

BQ24072T

BQ24075T

BQ24079T

www.ti.com

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

Product Folder Links: BQ24072T BQ24075T BQ24079T

(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

8.4 Thermal Information

THERMAL METRIC(1) RGT [VQFN] UNIT

16 PINS

RθJA Junction-to-ambient thermal resistance 45.8 °C/W

RθJC(top) Junction-to-case (top) thermal resistance 53.6 °C/W

RθJB Junction-to-board thermal resistance 18.1 °C/W

ψJT Junction-to-top characterization parameter 1.1 °C/W

ψJB Junction-to-board characterization parameter 18.0 °C/W

RθJC(bot) Junction-to-case (bottom) thermal resistance 5.2 °C/W

8.5 Electrical Characteristics

Over junction temperature range (0°C < TJ< 125°C) and the recommended supply voltage range (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

INPUT

VUVLO Under-voltage lock-out VIN: 0V →4V 3.2 3.3 3.4 V

VHYS-UVLO Hysteresis on UVLO VIN: 4V →0V 200 300 mV

VIN-DT Input power detection threshold (Input power detected if VIN > VBAT + VIN-DT)

VBAT = 3.6V, VIN: 3.5V →4V 55 80 140 mV

VHYS-INDT Hysteresis on VIN-DT VBAT = 3.6V, VIN: 4V →3.5V 20 mV

tDGL(PGOOD) Deglitch time, input power detected

status Time measured from VIN: 0V →5V,

1μs rise-time to PGOOD = LO 1.2 ms

VOVP Input overvoltage protection threshold VIN: 5V →7V 6.4 6.6 6.8 V

VHYS-OVP Hysteresis on OVP VIN: 7V →5V 240 mV

tBLK(OVP) Input over-voltage blanking time 50 μs

tREC(OVP) Input over-voltage recovery time Time measured from VIN: 11V →5V 1μs

fall-time to PGOOD = LO 1.2 ms

ILIM, ISET SHORT CIRCUIT TEST

ISC Current source 1.3 mA

VSC 520 mV

QUIESCENT CURRENT

IBAT(PDWN) Sleep current into BAT pin CE = LO or HI, input power not detected, no load

on OUT pin 6.5 μA

IIN(STDBY) Standby current into IN pin EN1= HI, EN2=HI, VIN ≤6V 50 μA

EN1= HI, EN2=HI, VIN > 6V 200

ICC Active supply current, IN pin CE = LO, VIN = 6V, no load on OUT pin,

VBAT > VBAT(REG), (EN1,EN2)≠(HI,HI) 1.5 mA

POWER PATH

VDO(IN-OUT) VIN – VOUT VIN = 4.3V, IIN = 1A, VBAT = 4.2V 300 475 mV

VDO(BAT-

OUT) VBAT – VOUT IOUT = 1A, VIN = 0V, VBAT > 3V 50 100 mV

VO(REG)

OUT pin voltage regulation

(BQ24072T)

VIN > VOUT + VDO(IN-OUT) , VBAT< 3.2 V 3.3 3.4 3.5

VIN > VOUT + VDO(IN-OUT) , VBAT ≥3.2 V VBAT +

150 mV VBAT +

225 mV VBAT +

270 mV

OUT pin voltage regulation

(BQ24075T, BQ24079T) VIN > VOUT + VDO(IN-OUT) 5.4 5.5 5.6

IIN-MAX Maximum input current

EN1 = LO, EN2 = LO 90 95 100 mA

EN1 = HI, EN2 = LO 450 475 500 mA

EN2 = HI, EN1 = LO KILIM/RIL IM A

KILIM Maximum input current factor ILIM ≥500mA 1500 1600 1700 AΩ

200mA < ILIM < 500mA 1330 1512 1700

IIN-MAX Programmable input current limit

range EN2 = HI, EN1 = LO, RILIM = 8kΩto 1.1kΩ200 1500 mA

VIN-DPM Input voltage threshold when input

current is reduced EN2 = LO, EN1 = X 4.35 4.5 4.63 V

l TEXAS INSTRUMENTS

BQ24072T

BQ24075T

BQ24079T

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

www.ti.com

Product Folder Links: BQ24072T BQ24075T BQ24079T

Electrical Characteristics (continued)

Over junction temperature range (0°C < TJ< 125°C) and the recommended supply voltage range (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

VDPPM Output voltage threshold when

charging current is reduced

BQ24072T VO(REG)

–180 mV VO(REG)

–100 mV VO(REG)

–30 mV V

BQ24075T, BQ24079T 4.2 4.3 4.4

VBSUP1 Enter battery supplement mode VOUT falling, Supplement mode entered when

VOUT < VBSUP1

VBAT –

40mV V

VBSUP2 Exit battery supplement mode VOUT rising, Supplement mode exited when VOUT

> VBSUP2

VBAT –

20mV V

VO(SC1) Output short-circuit detection

threshold, power-on 0.8 0.9 1.0 V

VO(SC2)

Output short-circuit detection

threshold, supplement mode VBAT –

VOUT > VO(SC2) indicates short-circuit 200 250 300 mV

tDGL(SC2) Deglitch time, supplement mode short

circuit 250 μs

tREC(SC2) Recovery time, supplement mode

short circuit 60 ms

BATTERY CHARGER

IBAT(SC) Source current for BAT pin short-

circuit detection 4 7.5 11 mA

VBAT(SC) BAT pin short-circuit detection

threshold 1.6 1.8 2.0 V

VBAT(REG) Battery charge voltage BQ24072T, BQ24075T 4.16 4.20 4.24 V

BQ24079T 4.059 4.100 4.141

VLOWV Pre-charge to fast-charge transition

threshold 2.9 3 3.1 V

tDGL1(LOWV) Deglitch time on pre-charge to fast-

charge transition 25 ms

tDGL2(LOWV) Deglitch time on fast-charge to pre-

charge transition 25 ms

ICHG Battery fast charge current range VBAT(REG) > VBAT > VLOWV, VIN = 5V, CE = LO,

EN1= LO, EN2 = HI 300 1500 mA

ICHG Battery fast charge current CE = LO, EN1= LO, EN2 = HI, VBAT > VLOWV,

VIN = 5V, IIN-MAX > ICHG, no load on OUT pin,

thermal loop not active, DPM loop not active KISET/RISET A

KISET Fast charge current factor 797 890 975 AΩ

IPRECHG Pre-charge current KPRECHG /RISET A

kPRECHG Pre-charge current factor 70 88 106

ITERM Charge current value for termination

detection threshold

CE = LO, (EN1,EN2)≠(LO,LO),

VBAT > VRCH, t < tMAXCH, VIN = 5V, DPM loop not

active, thermal loop not active 0.09×ICHG 0.1×ICHG 0.11×ICHG

CE = LO, (EN1,EN2)=(LO,LO),

VBAT > VRCH, t < tMAXCH, VIN = 5V, DPM loop not

active, thermal loop not active 0.027×ICHG 0.033×ICHG 0.040×ICHG

tDGL(TERM) Deglitch time, termination detected 25 ms

VRCH Recharge detection threshold VBAT(REG)

–140mV VBAT(REG)

–100mV VBAT(REG)

–60mV V

tDGL(RCH) Deglitch time, recharge threshold

detected 62.5 ms

tDGL(NO-IN) Delay time, input power loss to

charger turn-off VBAT = 3.6V. Time measured from VIN:

5V →3.3V 1μs fall-time 20 ms

IBAT(DET) Sink current for battery detection 5 7.5 10 mA

tDET Battery detection timer 250 ms

BATTERY CHARGING TIMERS

tPRECHG Pre-charge safety timer value TMR = floating 1440 1800 2160 s

tMAXCH Charge safety timer value TMR = floating 14400 18000 21600 s

tPRECHG Pre-charge safety timer

value(externally set) 18kΩ< RTMR < 72kΩRTMR x KTMR s

l TEXAS INSTRUMENTS

BQ24072T

BQ24075T

BQ24079T

www.ti.com

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

Product Folder Links: BQ24072T BQ24075T BQ24079T

Electrical Characteristics (continued)

Over junction temperature range (0°C < TJ< 125°C) and the recommended supply voltage range (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

tMAXCH Charge safety timer value (externally

set) 18kΩ< RTMR < 72kΩ10 x RTMR x KTMR s

KTMR Timer factor 35 45 55 s / kΩ

BATTERY – PACK NTC MONITOR

VHOT High temperature trip point Battery charging 12 12.5 13 % of

VIN

VHYS(HOT) Hysteresis on high trip point Battery charging 1 % of

VIN

VCOLD Low temperature trip point Battery charging 24.5 25 25.5 % of

VIN

VHYS(COLD) Hysteresis on low trip point Battery charging 1 % of

VIN

tDGL(TS) Deglitch time, pack temperature fault

detection Battery charging 50 ms

THERMAL REGULATION

TJ(REG) Temperature Regulation Limit 125 °C

TJ(OFF) Thermal shutdown temperature 155 °C

TJ(OFF-HYS) Thermal shutdown hysteresis 20 °C

LOGIC LEVELS ON EN1, EN2, CE, SYSOFF, TD

VIL Logic LOW input voltage 0 0.4 V

VIH Logic HIGH input voltage 1.4 6.0 V

IIL 1μA

IIH 10 μA

LOGIC LEVELS ON PGOOD, CHG

VOL Output LOW voltage ISINK = 5 mA 0.4 V

l TEXAS INSTRUMENTS

3.60

3.62

3.64

3.66

3.68

3.70

3.72

3.74

3.76

3.78

3.80

0 25 50 75 100 125

T -JunctionTemperature-°C

V -OutputVoltage-V

V =5V,

V =3.5V,

I =1 A

BAT

5.25

5.30

5.35

5.40

5.45

5.50

5.55

5.60

5.65

5.70

5.75

0 25 50 75 100 125

T -JunctionTemperature-°C

V -OutputVoltage-V

V =6V,

I =1 A

100

120

025 50 75 100 125

T -JunctionTemperature-°C

DropoutVoltage-V -V

BAT OUT

VBAT =3V

VBAT =3.9V

I =1 A

3.2

3.4

3.6

3.8

4.2

4.4

4.6

22.5 33.5 4 4.5

V -OutputVoltage-V

V -BatteryVoltage-V

BAT

V =5V

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0 25 50 75 100 125

T -JunctionTemperature-°C

DropoutVoltage-V -V

IN OUT

I =1 A

600

400

100

Temperature- C

300

200

500

120 125 130 135 140 145

I -mA

BAT

BQ24072T

BQ24075T

BQ24079T

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

www.ti.com

Product Folder Links: BQ24072T BQ24075T BQ24079T

8.6 Typical Characteristics

VIN = 6 V, EN1 = 1, EN2 = 0, TA= 25°C, unless otherwise noted.

Figure 1. Thermal Regulation Figure 2. Dropout Voltage vs Temperature

Figure 3. Dropout Voltage vs Temperature Figure 4. BQ24072T Output Regulation Voltage vs Battery

Voltage

Figure 5. BQ24072T Output Regulation Voltage vs

Temperature

Figure 6. Output Regulation Voltage vs Temperature

l TEXAS INSTRUMENTS

R=900

ISET W

0.95

0.97

0.99

1.01

1.03

1.05

33.2 3.4 3.6 3.8 4 4.2

I -FastChargeCurrent- A

BAT

V -BatteryVoltage-V

BAT

R=3k

ISET W

280

285

290

295

300

305

310

3 3.2 3.4 3.6 3.8 4 4.2

I -FastChargeCurrent- A

BAT

V -BatteryVoltage-V

BAT

6.45

6.50

6.55

6.60

6.65

6.70

0 25 50 75 100 125

T -JunctionTemperature-°C

V -OutputVoltageThreshold-V

OVP

6.6V

V Rising

V Falling

100

200

300

400

500

600

700

800

5 6 7 8 9 10

V -InputVoltage-V

I -InputCurrent-mA

LIM

RILIM

USB500

USB100

4.180

4.185

4.190

4.195

4.200

4.205

4.210

0510 15 20 25 30

T -JunctionTemperature-°C

V -RegulationVoltage-V

BAT

4.08

4.085

4.09

4.095

4.1

4.105

4.11

0 5 10 15 20 25 30

V -RegulationVoltage-V

BAT

T -JunctionTemperature-°C

BQ24072T

BQ24075T

BQ24079T

www.ti.com

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

Product Folder Links: BQ24072T BQ24075T BQ24079T

Typical Characteristics (continued)

VIN = 6 V, EN1 = 1, EN2 = 0, TA= 25°C, unless otherwise noted.

Figure 7. BQ24075T BAT Regulation Voltage vs

Temperature

Figure 8. BQ24079T Battery Regulation Voltage vs

Temperature

Figure 9. Overvoltage ProtectionThreshold vs Temperature Figure 10. Input Current Limit vs Input Voltage

Figure 11. Fastcharge Current vs Battery Voltage Figure 12. Fastcharge Current vs Battery Voltage

l TEXAS INSTRUMENTS

100

101

102

103

104

105

2 2.2 2.4 2.6 2.8 3

I -PrechargeCurrent- A

BAT

V -BatteryVoltage-V

BAT

R=900

ISET W

28.5

29.5

30.5

31.5

2 2.2 2.4 2.6 2.8 3

I -PrechargeCurrent- A

BAT

V -BatteryVoltage-V

BAT

R=3k

ISET W

BQ24072T

BQ24075T

BQ24079T

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

www.ti.com

Product Folder Links: BQ24072T BQ24075T BQ24079T

Typical Characteristics (continued)

VIN = 6 V, EN1 = 1, EN2 = 0, TA= 25°C, unless otherwise noted.

Figure 13. Fastcharge Current vs Battery Voltage Figure 14. Precharge Current vs Battery Voltage

l TEXAS INSTRUMENTS

USB100

USB5 00

VREF- ILIM

USB-susp

Short Detect

TJ(REG)

VDPPM

VOUT

VBAT(REG)

VBAT(SC)

VO(REG)

VO(SC1) OUT-SC1

tDGL(TERM)

BAT-SC

tDGL1(LOWV)

tDGL(RCH)

VLOWV

VRCH

VCOLD

VHOT

tDGL(NO-IN)

tDGL(PGOOD)

tBLK(OVP)

VBAT + VIN-DT

VUVLO

VOVP

VIN

Dynamically

Controlled

Oscillator

VIPRECHG

ICHG

VISET

Fast- Charge

Timer

Pre- Charge

Timer

Halt timers

Timer fault

EN1

EN2

USB Suspend

EN2

EN1

EN2

CHG

PGOOD

OUT

BAT

ISET

ILIM

Charge Control

VIN-DPM

VBAT OUT- SC2

Reset timers

tDGL( TS)

VOUT

Supplement

tDGL(SC2)

VBAT

250mV

40mV

tDGL2(LOWV)

225mV)

2.25V

Fastcharge

225mV

Precharge

SYSOFF

CHARGEPUMP

TMR

BQ24072T

BQ24075T

BQ24079T

www.ti.com

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

Product Folder Links: BQ24072T BQ24075T BQ24079T

9 Detailed Description

9.1 Overview

The BQ2407x devices are integrated Li-Ion linear chargers and system power path management devices

targeted at space-limited portable applications. The device powers the system while simultaneously and

independently charging the battery. This feature reduces the number of charge and discharge cycles on the

battery, allows for proper charge termination and enables the system to run with a defective or absent battery

pack. It also allows instant system turn-on even with a totally discharged battery. The input power source for

charging the battery and running the system can be an AC adapter or a USB port. The devices feature Dynamic

Power Path Management (DPPM), which shares the source current between the system and battery charging,

and automatically reduces the charging current if the system load increases. When charging from a USB port,

the input dynamic power management (VIN-DPM) circuit reduces the input current if the input voltage falls below a

threshold, preventing the USB port from crashing. The power-path architecture also permits the battery to

supplement the system current requirements when the adapter cannot deliver the peak system currents.

9.2 Functional Block Diagram

l TEXAS INSTRUMENTS pare-um: ccnsrcnncc Vnuam Elna _____ “Ill-y mm. cvnbn Ian-w Cur-m Dom: cm- W

BQ24072T

BQ24075T

BQ24079T

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

www.ti.com

Product Folder Links: BQ24072T BQ24075T BQ24079T

9.3 Feature Description

9.3.1 Undervoltage Lockout (UVLO)

The BQ2407X family remains in power down mode when the input voltage at the IN pin is below the

undervoltage threshold (UVLO). During the power down mode the host commands at the control inputs (CE, EN1

and EN2) are ignored. The Q1 FET connected between IN and OUT pins is off, and the status outputs, CHG and

PGOOD, are high impedance. The Q2 FET that connects BAT to OUT is ON. (If SYSOFF is high, Q2 is off).

During power down mode, the VOUT(SC2) circuitry is active and monitors for overload conditions on OUT.

9.3.2 Overvoltage Protection (OVP)

The BQ2407xT accepts inputs up to 28V without damage. Additionally, an overvoltage protection (OVP) circuit is

implemented that shuts off the internal LDO and discontinues charging when VIN > VOVP for a period longer than

tDGL(OVP). When in OVP, the system output (OUT) is connected to the battery and PGOOD is high impedance.

Once the OVP condition is removed, a new power on sequence starts (See the POWER ON section). The safety

timers are reset and a new charge cycle will be indicated by the CHG output.

9.3.3 Dynamic Power-Path Management

The BQ2407xT features an OUT output that powers the external load connected to the battery. This output is

active whenever a source is connected to IN or BAT. The following sections discuss the behavior of OUT with a

source connected to IN to charge the battery and a battery source only.

9.3.4 Battery Charging

Set CE low to initiate battery charging. First, the device checks for a short-circuit on the BAT pin by sourcing

IBAT(SC) to the battery and monitoring the voltage. When the BAT voltage exceeds VBAT(SC), the battery charging

continues. The battery is charged in three phases: conditioning pre-charge, constant current fast charge (current

regulation) and a constant voltage tapering (voltage regulation). In all charge phases, an internal control loop

monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is

exceeded.

Figure 15. Typical Charging Cycle

l TEXAS INSTRUMENTS

BQ24072T

BQ24075T

BQ24079T

www.ti.com

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

Product Folder Links: BQ24072T BQ24075T BQ24079T

Feature Description (continued)

Figure 15 illustrates a normal Li-Ion charge cycle using the BQ2407xT. In the pre-charge phase, the battery is

charged at with the pre-charge current (IPRECHG). Once the battery voltage crosses the VLOWV threshold, the

battery is charged with the fast-charge current (ICHG). As the battery voltage reaches VBAT(REG), the battery is held

at a constant voltage of VBAT(REG) and the charge current tapers off as the battery approaches full charge. When

the battery current reaches ITERM, the CHG pin indicates charging done by going high-impedance.

Note that termination detection is disabled whenever the charge rate is reduced because of the actions of the

thermal loop, the DPPM loop or the VIN-DPM loop.

The value of the fast-charge current is set by the resistor connected from the ISET pin to VSS, and is given by

Equation 1.

ICHG = KISET / RISET (1)

The charge current limit is adjustable up to 1.5A. The valid resistor range is 590Ωto 3 kΩ. Note that if ICHG is

programmed as greater than the input current limit, the battery will not charge at the rate of ICHG, but at the

slower rate of IIN(MAX) (minus the load current on the OUT pin, if any). In this case, the charger timers will be

proportionately slowed down.

9.3.5 Charge Current Translator

When the charger is enabled, internal circuits generate a current proportional to the charge current at the ISET

input. The current out of ISET is 1/400 (±10%) of the charge current. This current, when applied to the external

charge current programming resistor, RISET, generates an analog voltage that can be monitored by an external

host to calculate the current sourced from BAT.

VISET = ICHARGE / 400 × RISET (2)

StartPrecharge

/CHG= Low

Batteryshortdetected? Yes

No tPRECHARGE

Elapsed?

BeginCharging

EndCharge

Flash/CHG

IBAT < ITERM

Yes

TD = Low

(’72, ’73 Only)

(’74, ’75= YES)

TerminationReached

BATTFET Off

WaitforV

BAT < VRCH

Yes

VBAT > VLOWV

StartFastcharge

ICHARGE setbyISET

EndCharge

Flash/CHG

tFASTCHARGE

Elapsed?

ChargeDone

/CHG= Hi-Z

VBAT < VRCH

BatteryDetected?

RunBatteryDetection

Yes

BQ24072T

BQ24075T

BQ24079T

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

www.ti.com

Product Folder Links: BQ24072T BQ24075T BQ24079T

Feature Description (continued)

Figure 16. Battery Charging Flow Diagram

l TEXAS INSTRUMENTS

BQ24072T

BQ24075T

BQ24079T

www.ti.com

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

Product Folder Links: BQ24072T BQ24075T BQ24079T

Feature Description (continued)

9.3.6 Battery Detection and Recharge

The BQ2407xT automatically detects if a battery is connected or removed. Once a charge cycle is complete, the

battery voltage is monitored. When the battery voltage falls below VRCH, the battery detection routine is run.

During battery detection, current (IBAT(DET)) is pulled from the battery for a duration tDET to see if the voltage on

BAT falls below VLOWV. If not, charging begins. If it does, then it indicates that the battery is missing or the

protector is open. Next, the precharge current is applied for tDET to close the protector if possible. If VBAT < VRCH,

then the protector is closed and charging is initiated. If VBAT > VRCH, then the battery is determined to be missing

and the detection routine continues.

9.3.7 Termination Disable (TD Input, BQ24072T)

The BQ24072T contains a TD input that allows termination to be enabled/ disabled. Connect TD to a logic high

to disable charge termination. When termination is disabled, the device goes through the pre-charge, fast-charge

and CV phases, then remains in the CV phase. During the CV phase, the charger maintains the output voltage at

BAT equal to VBAT(REG), and charging current does not terminate. The charge current is set by ICHG or IINmax,

whichever is less. Battery detection is not performed. The CHG output is high impedance once the current falls

below ITERM and does not go low until the input power or CE are toggled. When termination is disabled, the pre-

charge and fast-charge safety timers are also disabled.

9.3.8 Battery Disconnect (SYSOFF Input)

The BQ24075T and BQ24079T feature a SYSOFF input that allows the user to turn the FET Q2 off and

disconnect the battery from the OUT pin. This is useful for disconnecting the system load from the battery,

factory programming where the battery is not installed or for host side impedance track fuel gauging, such as

BQ27500, where the battery open circuit voltage level must be detected before the battery charges or

discharges. The CHG output remains low when SYSOFF is high. Connect SYSOFF to VSS, to turn Q2 on for

normal operation. SYSOFF is internally pulled to VBAT through ~5 MΩresistor.

9.3.9 Dynamic Charge Timers (TMR Input)

The BQ2407xT devices contain internal safety timers for the pre-charge and fast-charge phases to prevent

potential damage to the battery and the system. The timers begin at the start of the respective charge cycles.

The timer values are programmed by connecting a resistor from TMR to VSS. The resistor value is calculated

using the following equation:

tPRECHG = KTMR × RTMR

tMAXCHG = 10 × KTMR × RTMR

Leave TMR unconnected to select the internal default timers. Disable the timers by connecting TMR to VSS.

Note that timers are suspended when the device is in thermal shutdown, and the timers are slowed proportionally

to the charge current when the device enters thermal regulation.

1. During the fast charge phase, several events increase the timer durations.

2. The system load current activates the DPPM loop which reduces the available charging current

3. The input current is reduced because the input voltage has fallen to VIN-DPM

4. The device has entered thermal regulation because the IC junction temperature has exceeded TJ(REG)

During each of these events, the internal timers are slowed down proportionately to the reduction in charging

current. For example, if the charging current is reduced by half for two minutes, the timer clock is reduced to half

the frequency and the counter counts half as fast resulting in only one minute of "counting" time.

If the precharge timer expires before the battery voltage reaches VLOWV, the BQ2407xT indicates a fault

condition. Additionally, if the battery current does not fall to ITERM before the fast charge timer expires, a fault is

indicated. The CHG output flashes at approximately 2 Hz to indicate a fault condition. The fault condition is

cleared by toggling CE or the input power, entering/ exiting USB suspend mode, or an OVP event.

l TEXAS INSTRUMENTS

BQ24072T

BQ24075T

BQ24079T

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

www.ti.com

Product Folder Links: BQ24072T BQ24075T BQ24079T

Feature Description (continued)

9.3.10 Status Indicators (PGOOD, CHG)

The BQ2407xT contains two open-drain outputs that signal its status. The PGOOD output signals when a valid

input source is connected. PGOOD is low when (VBAT + VIN(DT)) < VIN < VOVP. When the input voltage is outside

of this range, PGOOD is high impedance.

The charge cycle after power-up, CE going low, or exiting OVP is indicated with the CHG output on (low - LED

on), whereas all refresh (subsequent) charges will result in the CHG output off (open – LED off). In addition, the

CHG signals timer faults by flashing at approximately 2 Hz.

Table 2. PGOOD Status Indicator

INPUT STATE PGOOD OUTPUT

VIN < VUVLO Hi impedance

VUVLO < VIN < VIN(DT) Hi impedance

VIN(DT) < VIN < VOVF Low

VIN < VOVP Hi impedance

Table 3. CHG Status Indicator

CHARGE STATE CHG OUTPUT

Charging Low (for first charge cycle)

Charging suspended by thermal loop, or DPPM loop

Safety timers expired Flashing at 2 Hz

Charging done

Hi impedance

Recharging after termination

IC disabled or no valid input power

Battery absent

9.3.11 Thermal Regulation and Thermal Shutdown

The BQ2407xT contain a thermal regulation loop that monitors the die temperature. If the temperature exceeds

TJ(REG), the device automatically reduces the charging current to prevent the die temperature from increasing

further. In some cases, the die temperature continues to rise despite the operation of the thermal loop,

particularly under high VIN and heavy OUT system load conditions. Under these conditions, if the die temperature

increases to TJ(OFF), the input FET Q1 is turned OFF. FET Q2 is turned ON to ensure that the battery still powers

the load on OUT. Once the device die temperature cools by TJ(OFF-HYS), the input FET Q1 is turned on and the

device returns to thermal regulation. Continuous overtemperature conditions result in a "hiccup" mode. During

thermal regulation, the safety timers are slowed down proportionately to the reduction in current limit.

Note that this feature monitors the die temperature of the BQ2407xT. This is not synonymous with ambient

temperature. Self heating exists due to the power dissipated in the IC because of the linear nature of the battery

charging algorithm and the LDO associated with OUT. A modified charge cycle with the thermal loop active is

shown in Figure 17. Battery termination is disabled during thermal regulation.

l TEXAS INSTRUMENTS 777777 7 7 7 7’ l I I l \ ' l l I I I ””” 7 ’ , , z , ’ , I l 7 7777777777

1 1

COLD HOT

IN IN

HOT COLD

V RCOLD RHOT

V V

RHOT RCOLD

V V

é ù

´ ´ ´ -

ê ú

ë û

=é ù é ù

´ - - ´ -

ê ú ê ú

ë û ë û

61 1

COLD

R RCOLD

PRECHARGE CCFAST

CHARGE

CVTAPER DONETHERMAL

REGULATION

BatteryVoltage

BatteryCurrent

HI-z

ICJunctionTemperature,TJ

VO(REG)

IO(CHG)

V(LOWV)

I(PRECHG)

I(TERM)

TJ(REG)

BQ24072T

BQ24075T

BQ24079T

www.ti.com

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

Product Folder Links: BQ24072T BQ24075T BQ24079T

Figure 17. Charge Cycle Modified by Thermal Loop

9.3.12 Battery Pack Temperature Monitoring

The BQ2407xT features an external battery pack temperature monitoring input. The TS input connects to the

NTC thermistor in the battery pack to monitor battery temperature and prevent dangerous over-temperature

conditions. During charging, the voltage at TS is continuously monitored. If, at any time, the voltage at TS is

outside of the operating range (VCOLD to VHOT), charging is suspended. The timers maintain their values but

suspend counting. When the voltage measured at TS returns to within the operation window, charging is

resumed and the timers continue counting. When charging is suspended due to a battery pack temperature fault,

the CHG output remains low and continues to indicate charging.

(3)

(4)

l TEXAS INSTRUMENTS Adapter

TS TEMP

PACK

PACK-

VHOT

VCOLD

Adapter

Not necessary

in all

applications

BQ240xT

BQ24072T

BQ24075T

BQ24079T

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

www.ti.com

Product Folder Links: BQ24072T BQ24075T BQ24079T

Where:

VCOLD = 0.25 X VIN

VHOT = 0.125 X VIN

RHOT is the expected thermistor resistance at the programmed hot threshold, RCOLD is the expected thermistor

resistance at the programmed cold threshold. If the value of R6 is less than 100 kΩ, R8 must be added to protect

the IC from 28V inputs. If R6 is greater than 100 kΩ, R8 does not need to be used.

Figure 18. NTC Monitoring Function

For applications that do not require the TS monitoring function, set R6 = 200 kΩand R7 = 49.9 kΩto set the TS

voltage at a valid level and maintain charging.

9.4 Device Functional Modes

9.4.1 Input Source Connected (Adapter or USB)

With a source connected, the dynamic power-path management (DPPM) circuitry of the BQ2407xT monitors the

input current continuously. The OUT output for the BQ24075T and BQ24079T is regulated to a fixed voltage

(VO(REG)). For the BQ24072T, OUT is regulated to 225 mV above the voltage at BAT. If the BAT voltage is less

than 3.2 V, OUT is clamped to 3.4 V. This allows for proper startup of the system load even with a discharged

battery. The current into IN is shared between charging the battery and powering the system load at OUT. The

BQ2407xT has internal selectable current limits of 100 mA (USB100) and 500 mA (USB500) for charging from

USB ports, as well as a resistor-programmable input current limit.

The BQ2407xT is USB IF compliant for the inrush current testing. The USB spec allows up to 10 μF to be hard

started, which establishes 50μC as the maximum inrush charge value when exceeding 100 mA. The input

current limit for the BQ2407xT prevents the input current from exceeding this limit, even with system

capacitances greater than 10 μF. Note that the input capacitance to the device must be selected small enough to

prevent a violation (<10 μF), as this current is not limited. Figure 19 demonstrates the startup of the BQ2407xT

and compares it to the USB-IF specification.

l TEXAS INSTRUMENTS U531 0 Current Limil 50v!) 100 usldlv 20 mNdiv

BQ24072T

BQ24075T

BQ24079T

www.ti.com

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

Product Folder Links: BQ24072T BQ24075T BQ24079T

Device Functional Modes (continued)

Figure 19. USB-IF Inrush Current Test

The input current limit selection is controlled by the state of the EN1 and EN2 pins as shown in Table 1. When

using the resistor-programmable current limit, the input current limit is set by the value of the resistor connected

from the ILIM pin to VSS, and is given by the equation:

IIN-MAX = KILIM / RILIM (5)

The input current limit is adjustable up to 1.5 A. The valid resistor range is 1.07 kΩto 7.5 kΩ.

When the IN source is connected, priority is given to the system load. The DPPM and Battery Supplement

modes are used to maintain the system load. Figure 21 illustrates an example of the DPPM and supplement

modes. These modes are explained in detail in the following sections.

9.4.1.1 Input DPM Mode (VIN-DPM)

The BQ2407xT uses the VIN-DPM mode for operation from current-limited USB ports. When EN1 and EN2 are

configured for USB100 (EN2=0, EN1=0) or USB500 (EN2=0, EN1=1) modes, the input voltage is monitored. If

VIN falls to VIN-DPM, the input current limit is reduced to prevent the input voltage from falling further. This prevents

the BQ2407xT from crashing poorly designed or incorrectly configured USB sources. Figure 20 shows the VIN-

DPM behavior to a current limited source. In this figure, the input source has a 400 mA current limit and the device

is in USB500 mode (EN1=1, EN2=0).

l TEXAS INSTRUMENTS 200 "IA/div , Input collapses Input regulaléd [a VIN-DPM 500 mAldiv Input current limit Is 200 mAldiv reduced to prevent crashing the supply 200 mA/div 4 msldiv

BQ24072T

BQ24075T

BQ24079T

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

www.ti.com

Product Folder Links: BQ24072T BQ24075T BQ24079T

Device Functional Modes (continued)

Figure 20. VIN-DPM Mode

9.4.1.2 DPPM Mode

When the sum of the charging and system load currents exceeds the maximum input current (programmed with

EN1, EN2 and ILIM pins), the voltage at OUT decreases. Once the voltage on the OUT pin falls to VDPPM, the

BQ2407xT enters DPPM mode. In this mode, the charging current is reduced as the OUT current increases in

order to maintain the system output. Battery termination is disabled while in DPPM mode.

9.4.1.3 Battery Supplement Mode

While in DPPM mode, if the charging current falls to zero and the system load current increases beyond the

programmed input current limit, the voltage at OUT reduces further. When the OUT voltage drops below the

VBSUP1 threshold, the battery supplements the system load. The battery stops supplementing the system load

when the voltage at OUT rises above the VBSUP2 threshold.

During supplement mode, the battery supplement current is not regulated (BAT-FET is fully on), however there is

a short circuit protection circuit built in. demonstrate supplement mode. If during battery supplement mode, the

voltage at OUT drops VO(SC2) below the BAT voltage, the OUT output is turned off if the overload exists after

tDGL(SC2). The short circuit recovery timer then starts counting. After tREC(SC2), OUT turns on and attempts to

restart. If the short circuit remains, OUT is turned off and the counter restarts. Battery termination is disabled

while in supplement mode.

*5; TEXAS INSTRUMENTS WMWWW swmmme my 7,777,777,777 E

1200mA

900mA

400mA

0mA

IOUT

900mA

500mA

0mA

IIN

500mA

-300mA

0mA

IBAT

3.8V

3.7V

~3.6V

VOUT

DPPMLoop Active

SupplementMode

5.5V

BQ24072T

BQ24075T

BQ24079T

www.ti.com

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

Product Folder Links: BQ24072T BQ24075T BQ24079T

Device Functional Modes (continued)

Figure 21. BQ24075T, '79T DPPM and Battery Supplement Modes

(VOREG = 5.5 V, VBAT = 3.6 V)

Figure 22. BQ24072T DPPM and Battery Supplement Modes

(VOREG = VBAT + 225 mV, VBAT = 3.6 V)

l TEXAS INSTRUMENTS

BQ24072T

BQ24075T

BQ24079T

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

www.ti.com

Product Folder Links: BQ24072T BQ24075T BQ24079T

Device Functional Modes (continued)

9.4.2 Input Source Not Connected

When no source is connected to the IN input, OUT is powered strictly from the battery. During this mode the

current into OUT is not regulated, similar to Battery Supplement Mode, however the short circuit circuitry is

active. If the OUT voltage falls below the BAT voltage by 250 mV for longer than tDGL(SC2), OUT is turned off. The

short circuit recovery timer then starts counting. After tREC(SC2), OUT turns on and attempts to restart. If the short

circuit remains, OUT is turned off and the counter restarts. This ON/OFF cycle continues until the overload

condition is removed.

‘5‘ TEXAS INSTRUMENTS E. ii

VSS

BAT

DC+

GND

Adaptor

HOST

BQ24075T

BQ24079T

OUT

CHG

PGOOD

SYSOFF

EN1

EN2

TMR

ILIM

ISET

TEMP

PACK +

PACK-

1µF C2

4.7µF

4.7 µF

1.13 kW

1.18 kW

1.5 kW

46.8 kW

SYSTEM

19.1 kW

8.25 kW.

100 kW

1.5 kW

BQ24072T

BQ24075T

BQ24079T

www.ti.com

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

Product Folder Links: BQ24072T BQ24075T BQ24079T

10 Applications and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

10.1 Application Information

The BQ2407xT series of devices are integrated Li-ion linear chargers and system power path management

devices targeted at space-limited portable applications.

10.2 Typical Applications

10.2.1 Using the BQ24075T, BQ24079T to Disconnect the Battery from the System

The BQ24075T and BQ24079T are designed for applications that require the input supply to be passed through

to the output (OUT). For these devices, the OUT regulation threshold is set to 5.5 V. for applications with a

typical regulation on the adapter of 5 V, the main LDO in the BQ24075T and BQ24079T operates in dropout

mode so that OUT is as high as possible to supply downstream devices. The input OVP and regulation threshold

on OUT protect downstream devices from faulty or incorrect adapters. The BQ24075T and BQ24079T also

contain a SYSOFF input that disconnects the OUT output from the battery to prevent standby loads from draining

the battery during long storage intervals. See the "System ON/OFF" section for more details.

NOTE: VIN = UVLO to VOVP, IFASTCHG = 800mA, IIN(MAX) = 1.35A, Battery Temperature Charge Range = 0°C to 50°C, 6.25

hour Fastcharge Safety Timer

Figure 23. Using the BQ24075T, BQ24079T to Disconnect the Battery from the System

10.2.1.1 Design Requirements

• Supply voltage = 5 V

• Fast charge current of approximately 800 mA; ISET – pin 16

• Input Current Limit = 1.35 A; ILIM – pin 12

• Safety timer duration, Fast-Charge = 6.25 hours; TMR – pin 14

• Battery Temperature Sense = 10 kΩ; NTC (103AT-2), 0°C to 50°C Operation

l TEXAS INSTRUMENTS

1.25

6 19.14

1 1 1 1

7 8250 28160

COLD

R k

R RCOLD

= = = W

+ +

1 1 1 1

5 28160 4086

1.25 0.625

7 8.236

5 5

4086 1 28160 1

1 1 0.625 1.25

COLD HOT

IN IN

HOT COLD

V RCOLD RHOT

V V

R k

V V

RHOT RCOLD

V V

é ù é ù

´ ´ ´ - ´ ´ ´ -

ê ú ê ú

ë û ë û

= = = W

é ù é ù é ù é ù

´ - - ´ -

ê ú ê ú ê ú ê ú

ë û ë û

BQ24072T

BQ24075T

BQ24079T

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

www.ti.com

Product Folder Links: BQ24072T BQ24075T BQ24079T

Typical Applications (continued)

10.2.1.2 Detailed Design Procedure

10.2.1.2.1 Program the Fast Charge Current (ISET):

• RISET = KISET / ICHG

• KISET = 890 AΩ; from the Electrical Characteristics table

• RISET = 890 AΩ/ 0.8 A = 1.1125 kΩ

• Select the closest standard value, which for this case is 1.13 kΩ. Connect this resistor between ISET (pin 16)

and VSS.

10.2.1.2.2 Program the Input Current Limit (ILIM):

• RILIM = KILIM / IIN(MAX)

• KILIM = 1600 AΩ; from the Electrical Characteristics table

• RISET = 1600 AΩ/ 1.35 A = 1.19 kΩ

• Select the closest standard value, which for this case is 1.18 kΩ. Connect this resistor between ILIM (pin 12)

and VSS.

10.2.1.2.3 Program 6.25-hour Fast-Charge Safety Timer (TMR):

• RTMR = tMAXCHG / (10 × KTMR)

• KTMR = 45 s/kΩfrom the Electrical Characteristics table.

• RTMR = (6.25 hr × 3600 s/hr) / (10 x 45 s/kΩ) = 46.8kΩ;

• Select the closest standard value, which for this case is 46.4 kΩ. Connect this resistor between TMR (pin 2)

and VSS.

10.2.1.2.4 TS Function:

Using a 10 kΩNTC thermistor in the battery pack (103AT-2). Connect a resistor divider from VIN to VSS with the

thermistor and TS connected to the center tap (R6 and R7 in Figure 23).

• RHOT = 4.086 kΩ; 50°C threshold from NTC data sheet

• RCOLD = 28.16 kΩ; 0°C threshold from NTC data sheet

• VCOLD = 0.25 x VIN = 0.25 x 5 V = 1.25 V

• VHOT = 0.125 x VIN = 0.125 x 5 V = 0.625 V

(6)

(7)

Since the calculated values for R6 is less than 100 kΩ, a 100 kΩresistor for R8 must be used. Choose the

closest standard values, which for this case are R7 = 8.25 kΩand R6 = 19.1 kΩ.

For applications that do not require the TS monitoring function, set R6 = 200 kΩand R7 = 49.9 kΩto set the TS

voltage at a valid level and maintain charging.

10.2.1.2.5 CHG and PGOOD LED Status:

Connect a 1.5 kΩresistor in series with a LED between OUT and CHG to indicate charging status. Connect a

1.5 kΩresistor in series with a LED between OUT and PGOOD to indicate when a valid input source is

connected.

l TEXAS INSTRUMENTS _ — /‘ .._..._.

IOUT

IBAT

200mA/div

2 ms/div

VOUT

5.5V

500mV/div

200mA/div

VCHG

IBAT

2V/div

400ms/div

VBAT

1 A/div

5V/div

Battery

Removed

BatteryDetectionMode

VCHG

IBAT

2V/div

400 ms/div

VBAT

1 A/div

5V/div

ChargingInitiated

BatteryDetectionMode

BatteryInserted

VIN

500mV/div

4ms/div

5V/div

IBAT

VPGOOD 5V/div

3.6V

BAT

500mA/div

BQ24072T

BQ24075T

BQ24079T

www.ti.com

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

Product Folder Links: BQ24072T BQ24075T BQ24079T

Typical Applications (continued)

10.2.1.2.6 Processor Monitoring Status:

Connect a pullup resistor (on the order of 100 kΩ) between the processor power rail and CHG and PGOOD.

10.2.1.2.7 System ON/OFF (SYSOFF):

Connect SYSOFF high to disconnect the battery from the system load. Connect SYSOFF low for normal

operation.

10.2.1.2.8 Selecting IN, OUT and BAT Capacitors

In most applications, all that is needed is a high-frequency decoupling capacitor (ceramic) on the power pin,

input, output and battery pins. Using the values shown on the application diagram, is recommended. After

evaluation of these voltage signals with real system operational conditions, one can determine if capacitance

values can be adjusted toward the minimum recommended values (DC load application) or higher values for fast

high amplitude pulsed load applications. Note if designed high input voltage sources (bad adapters or wrong

adapters), the capacitor needs to be rated appropriately. Ceramic capacitors are tested to 2x their rated values

so a 16 V capacitor may be adequate for a 30 V transient (verify tested rating with capacitor manufacturer).

10.2.1.3 Application Curves

RLOAD = 10 Ω

Figure 24. Adapter Plug-In Battery Connected Figure 25. Battery Detection / Battery Inserted

Figure 26. Battery Detection / Battery Removed

ILOAD = 25 mA TO 250 mA

Figure 27. Entering and Exiting, DPPM Mode

l TEXAS INSTRUMENTS

5V/div

500mA/div

4ms/div

2V/div

VSYSOFF

IBAT

4V

BAT

VOUT

BatteryPowering

System SystemPowerOff

2V/div

200mV/div

500mA/div

40 s/divm

VIN

IBAT

4.2V

BAT

4.3V

OUT

5V/div

2V/div

400 s/divm

500mA/div

VSYSOFF

IBAT

4V

BAT

5.5V

OUT

2 ms/div

IOUT

IBAT

4.1 V

BAT

5.5 V

OUT

500 mA/div

500 mV/div

500 mA/div

Supplement Mode

VCE

IBAT

3.6V

BAT

VCHG

500mA/div

1V/div

5V/div

10ms/div

MandatoryPrecharge

BQ24072T

BQ24075T

BQ24079T

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

www.ti.com

Product Folder Links: BQ24072T BQ24075T BQ24079T

Typical Applications (continued)

ILOAD = 25 mA to 750 mA

Figure 28. BQ24075T, BQ24079T Entering and Exiting

Battery, Supplement Mode

Figure 29. Charger On/Off Using CE

VIN = 5.5 V to 8.5 V

Figure 30. OVP Fault

VIN = 6 V

Figure 31. BQ24075T, BQ24079T System On/Off With Input

Connected

VIN = 0 V

Figure 32. BQ24075T, BQ24079T System On/Off With Input Not Connected

‘5‘ TEXAS INSTRUMENTS xx LI: xx L<(|; szj="">

VSS

BAT

DC+

GND

Adaptor

HOST

BQ24072T

OUT

EN1

EN2

TEMP PACK+

PACK-

SYSTEM

ISET

PGOOD

CHG

TMR

ILM

1.13 kW

100 kW

46.4 kW

1.18 kW

1.5 kW

4.7 Fm

1 Fm

4.7 Fm

1.5 kW

10 kW

13.2 kW

BQ24072T

BQ24075T

BQ24079T

www.ti.com

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

Product Folder Links: BQ24072T BQ24075T BQ24079T

Typical Applications (continued)

10.2.2 BQ24072T in a Host Controlled Charger Application

The BQ24072T is designed for applications that require a lower regulation on the system rail. For BQ24072T, the

OUT regulation threshold is set to VBAT + 225 mV. The lower regulation point protects downstream devices from

the higher voltage on the supply. Additionally, the lower difference between the BAT and OUT outputs decreases

the voltage drop during supplement events. The BQ24072T also contains a TD input that enables/disables the

termination function. See the Termination Disable: section for more details.

Figure 33. Using BQ24072T in a Host Controlled Charger Application

10.2.2.1 Design Requirements

Refer to the Design Requirements for the Design Requirements.

10.2.2.2 Detailed Design Procedures

Refer to the Detailed Design Procedure for the Detailed Design Procedures.

10.2.2.2.1 Termination Disable:

Connect TD high to disable termination. Connect TD low to enable termination.

l TEXAS INSTRUMENTS

IOUT

IBAT

200mA/div

2 ms/div

VOUT

5.5V

500mV/div

200mA/div

IOUT

IBAT

3.6V

BAT

500mA/div

200mV/div

1ms/div

3.825V

OUT

1 A/div

SupplementMode

TrackingtoV +225mV

BAT

BQ24072T

BQ24075T

BQ24079T

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

www.ti.com

Product Folder Links: BQ24072T BQ24075T BQ24079T

Typical Applications (continued)

10.2.2.3 Application Curves

ILOAD = 25 mA to 250 mA

Figure 34. Entering and Exiting, DPPM Mode

RLOAD = 20 Ωto 40 Ω

Figure 35. BQ2472T Entering and Exiting Battery,

Supplement Mode

l TEXAS INSTRUMENTS

/ PGOOD = Low

VUVLO <VIN <VOVP

and

VIN >V BAT +VIN (DT)

Yes

EN1=EN2=1

Yes

ILIMorISET short?

Yes

/ PGOOD= Hi -Z

/CHG = Hi-Z

BATTFET ON

BeginStartup

IIN (MAX ) 100mA

VOUT short?

Yes

InputCurrent

LimitsetbyEN1

andEN2

/CE = Low

BeginCharging

Yes

BQ24072T

BQ24075T

BQ24079T

www.ti.com

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

Product Folder Links: BQ24072T BQ24075T BQ24079T

11 Power Supply Recommendations

11.1 Power On

When VIN exceeds the UVLO threshold, the BQ2407xT powers up. While VIN is below VBAT + VIN(DT), the host

commands at the control inputs (CE, EN1 and EN2) are ignored. The Q1 FET connected between IN and OUT

pins is off, and the status outputs CHG and PGOOD are high impedance. The Q2 FET that connects BAT to

OUT is ON. (If SYSOFF is high, Q2 is off). During this mode, the VOUT(SC2) circuitry is active and monitors for

overload conditions on OUT.

Once VIN rises above VBAT + VIN(DT), PGOOD is driven low to indicate the valid power status and the CE, EN1,

and EN2 inputs are read. The device enters standby mode if (EN1 = EN2 = HI) or if an input overvoltage

condition occurs. In standby mode, Q1 is OFF and Q2 is ON so OUT is connected to the battery input. (If

SYSOFF is high, FET Q2 is off). During this mode, the VOUT(SC2) circuitry is active and monitors for overload

conditions on OUT.

When the input voltage at IN is within the valid range: VIN > UVLO AND VIN > VBAT + VIN(DT) AND VIN < VOVP, and

the EN1 and EN2 pins indicate that the USB suspend mode is not enabled [(EN1, EN2) ≠(HI, HI)] all internal

timers and other circuit blocks are activated. The device then checks for short-circuits at the ISET and ILIM pins.

If no short conditions exists, the device switches on the input FET Q1 with a 100mA current limit to checks for a

short circuit at OUT. When VOUT is above VSC, the FET Q1 switches to the current limit threshold set by EN1,

EN2 and RILIM and the device enters into the normal operation. During normal operation, the system is powered

by the input source (Q1 is regulating), and the device continuously monitors the status of CE, EN1 and EN2 as

well as the input voltage conditions.

Figure 36. Startup Flow Diagram

l TEXAS INSTRUMENTS

BQ24072T

BQ24075T

BQ24079T

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

www.ti.com

Product Folder Links: BQ24072T BQ24075T BQ24079T

Power On (continued)

11.1.1 Half-Wave Adapters

Some adapters implement a half rectifier topology, which causes the adapter output voltage to fall below the

battery voltage during part of the cycle. To enable operation with adapters under those conditions, the BQ2407xT

family keeps the charger on for at least 20 msec (typical) after the input power puts the part in sleep mode. This

feature enables use of external adapters using 50 Hz networks. The input must not drop below the UVLO voltage

for the charger to work properly. Thus, the battery voltage should be above the UVLO to help prevent the input

from dropping out. Additional input capacitance may be needed.

When the input is between VUVLO and VIN(DT), the device enters sleep mode. After entering sleep mode for 20 ms

the internal FET connection between the IN and OUT pin is disabled and pulling the input to ground will not

discharge the battery, other than the leakage on the BAT pin. If one has a full 1000mAHr battery and the leakage

is 10 μA, then it would take 1000 mAHr/10μA = 100000 hours (11.4 years) to discharge the battery. The battery

‘s self discharge is typically 5 times higher than this.

l TEXAS INSTRUMENTS

BQ24072T

BQ24075T

BQ24079T

www.ti.com

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

Product Folder Links: BQ24072T BQ24075T BQ24079T

12 Layout

12.1 Layout Guidelines

1. To obtain optimal performance, the decoupling capacitor from IN to GND (thermal pad) and the output filter

capacitors from OUT to GND (thermal pad) should be placed as close as possible to the BQ2407xT, with

short trace runs to both IN, OUT and GND (thermal pad).

2. All low-current GND connections should be kept separate from the high-current charge or discharge paths

from the battery. Use a single-point ground technique incorporating both the small signal ground path and the

power ground path.

3. The high current charge paths into IN pin and from the OUT pin must be sized appropriately for the

maximum charge current in order to avoid voltage drops in these traces.

The BQ2407xT family is packaged in a thermally enhanced MLP package. The package includes a thermal pad

to provide an effective thermal contact between the IC and the printed circuit board (PCB); this thermal pad is

also the main ground connection for the device. Connect the thermal pad to the PCB ground connection. Full

PCB design guidelines for this package are provided in QFN and SON PCB Attachment Application Report.

12.2 Layout Example

Figure 37. BQ2407xT Layout

l TEXAS INSTRUMENTS

BQ24072T

BQ24075T

BQ24079T

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

www.ti.com

Product Folder Links: BQ24072T BQ24075T BQ24079T

12.3 Thermal Package

The BQ2407xT family is packaged in a thermally enhanced MLP package. The package includes a thermal pad

to provide an effective thermal contact between the IC and the printed circuit board (PCB). The power pad

should be directly connected to VSS. Full PCB design guidelines for this package are provided in the application

note entitled: QFN/SON PCB Attachment Application Note. The most common measure of package thermal

performance is thermal impedance (θJA) measured (or modeled) from the chip junction to the air surrounding the

package surface (ambient).

The mathematical expression for θJA is: = (TJ– T) / P

Where:

• TJ= chip junction temperature

• T = ambient temperature

• P = device power dissipation

• Factors that can influence the measurement and calculation of θJA include

• Whether or not the device is board mounted

• Trace size, composition, thickness, and geometry

• Orientation of the device (horizontal or vertical)

• Volume of the ambient air surrounding the device under test and airflow

• Whether other surfaces are in close proximity to the device being tested

Due to the charge profile of Li-Ion batteries the maximum power dissipation is typically seen at the beginning of

the charge cycle when the battery voltage is at its lowest. Typically after fast charge begins the pack voltage

increases to 3.4 V within the first 2 minutes. The thermal time constant of the assembly typically takes a few

minutes to heat up so when doing maximum power dissipation calculations, 3.4 V is a good minimum voltage to

use. This is verified, with the system and a fully discharged battery, by plotting temperature on the bottom of the

PCB under the IC (pad should have multiple vias), the charge current and the battery voltage as a function of

time. The fast charge current will start to taper off if the part goes into thermal regulation.

The device power dissipation, P, is a function of the charge rate and the voltage drop across the internal

PowerFET. It can be calculated from Equation 8 when a battery pack is being charged:

P = [VIN – VOUT] × [ IOUT + IBAT ] + [VOUT – VBAT] × IBAT (8)

The thermal loop feature reduces the charge current to limit excessive IC junction temperature. It is

recommended that the design not run in thermal regulation for typical operating conditions (nominal input voltage

and nominal ambient temperatures) and use the feature for non typical situations such as hot environments or

higher than normal input source voltage. With that said, the IC still performs as described, if the thermal loop is

always active.

l TEXAS INSTRUMENTS

BQ24072T

BQ24075T

BQ24079T

www.ti.com

SLUS937C –DECEMBER 2009–REVISED DECEMBER 2019

Product Folder Links: BQ24072T BQ24075T BQ24079T

13 Device and Documentation Support

13.1 Device Support

13.1.1 Third-Party Products Disclaimer

TI'S PUBLICATION OF INFORMATION REGARDING THIRD-PARTY PRODUCTS OR SERVICES DOES NOT

CONSTITUTE AN ENDORSEMENT REGARDING THE SUITABILITY OF SUCH PRODUCTS OR SERVICES

OR A WARRANTY, REPRESENTATION OR ENDORSEMENT OF SUCH PRODUCTS OR SERVICES, EITHER

ALONE OR IN COMBINATION WITH ANY TI PRODUCT OR SERVICE.

13.2 Related Links

The table below lists quick access links. Categories include technical documents, support and community

resources, tools and software, and quick access to order now.

Table 4. Related Links

PARTS PRODUCT FOLDER ORDER NOW TECHNICAL

DOCUMENTS TOOLS &

SOFTWARE SUPPORT &

COMMUNITY

BQ24072T Click here Click here Click here Click here Click here

BQ24075T Click here Click here Click here Click here Click here

BQ24079T Click here Click here Click here Click here Click here

13.3 Receiving Notification of Documentation Updates

To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper

right corner, click on Alert me to register and receive a weekly digest of any product information that has

changed. For change details, review the revision history included in any revised document.

13.4 Support Resources

TI E2E™ support forums are an engineer's go-to source for fast, verified answers and design help — straight

from the experts. Search existing answers or ask your own question to get the quick design help you need.

Linked content is provided "AS IS" by the respective contributors. They do not constitute TI specifications and do

not necessarily reflect TI's views; see TI's Terms of Use.

13.5 Trademarks

E2E is a trademark of Texas Instruments.

All other trademarks are the property of their respective owners.

13.6 Electrostatic Discharge Caution

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

13.7 Glossary

SLYZ022 —TI Glossary.

This glossary lists and explains terms, acronyms, and definitions.

14 Mechanical, Packaging, and Orderable Information

The following pages include mechanical, packaging, and orderable information. This information is the most

current data available for the designated devices. This data is subject to change without notice and revision of

this document. For browser-based versions of this data sheet, refer to the left-hand navigation.

I TEXAS INSTRUMENTS Samples Samples Sample: Sample: Samples Samples

PACKAGE OPTION ADDENDUM

www.ti.com 10-Dec-2020

Addendum-Page 1

PACKAGING INFORMATION

Orderable Device Status

(1)

Package Type Package

Drawing Pins Package

Qty Eco Plan

(2)

Lead finish/

Ball material

(6)

MSL Peak Temp

(3)

Op Temp (°C) Device Marking

(4/5)

Samples

BQ24072TRGTR ACTIVE VQFN RGT 16 3000 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 85 PAP

BQ24072TRGTT ACTIVE VQFN RGT 16 250 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 85 PAP

BQ24075TRGTR ACTIVE VQFN RGT 16 3000 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 85 OEC

BQ24075TRGTT ACTIVE VQFN RGT 16 250 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 85 OEC

BQ24079TRGTR ACTIVE VQFN RGT 16 3000 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 85 OED

BQ24079TRGTT ACTIVE VQFN RGT 16 250 RoHS & Green NIPDAU Level-2-260C-1 YEAR -40 to 85 OED

(1) The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

(2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance

do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may

reference these types of products as "Pb-Free".

RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.

Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based

flame retardants must also meet the <=1000ppm threshold requirement.

(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.

(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation

of the previous line and the two combined represent the entire Device Marking for that device.

(6) Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two

lines if the finish value exceeds the maximum column width.

I TEXAS INSTRUMENTS

PACKAGE OPTION ADDENDUM

www.ti.com 10-Dec-2020

Addendum-Page 2

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information

provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and

continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.

TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

I TEXAS INSTRUMENTS 5:. V.’

PACKAGE MATERIALS INFORMATION

www.ti.com 3-Jun-2022

TAPE AND REEL INFORMATION

Reel Width (W1)

REEL DIMENSIONS

Dimension designed to accommodate the component length

Dimension designed to accommodate the component thickness

Overall width of the carrier tape

Pitch between successive cavity centers

Dimension designed to accommodate the component width

TAPE DIMENSIONS

K0 P1

B0 W

Cavity

QUADRANT ASSIGNMENTS FOR PIN 1 ORIENTATION IN TAPE

Pocket Quadrants

Sprocket Holes

Q1 Q1Q2 Q2

Q3 Q3Q4 Q4 User Direction of Feed

Reel

Diameter

*All dimensions are nominal

Device Package

Type Package

Drawing Pins SPQ Reel

Diameter

(mm)

Reel

Width

W1 (mm)

(mm) B0

(mm) K0

(mm) P1

(mm) W

(mm) Pin1

Quadrant

BQ24072TRGTR VQFN RGT 16 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2

BQ24072TRGTT VQFN RGT 16 250 180.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2

BQ24075TRGTR VQFN RGT 16 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2

BQ24075TRGTT VQFN RGT 16 250 180.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2

BQ24079TRGTR VQFN RGT 16 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2

BQ24079TRGTT VQFN RGT 16 250 180.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2

Pack Materials-Page 1

PACKAGE MATERIALS INFORMATION

www.ti.com 3-Jun-2022

TAPE AND REEL BOX DIMENSIONS

Width (mm)

*All dimensions are nominal

Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)

BQ24072TRGTR VQFN RGT 16 3000 367.0 367.0 35.0

BQ24072TRGTT VQFN RGT 16 250 210.0 185.0 35.0

BQ24075TRGTR VQFN RGT 16 3000 367.0 367.0 35.0

BQ24075TRGTT VQFN RGT 16 250 210.0 185.0 35.0

BQ24079TRGTR VQFN RGT 16 3000 367.0 367.0 35.0

BQ24079TRGTT VQFN RGT 16 250 210.0 185.0 35.0

Pack Materials-Page 2

GENERIC PACKAGE VIEW RGT 16 VQFN - 1 mm max heigm PLASTIC QUAD FLATPACKV N0 LEAD Images above are jusl a represenlalion of the package family, aclual package may vary Refel lo the product dala sheel for package details. 4203495” I TEXAS INSTRI IMFNTS

www.ti.com

PACKAGE OUTLINE

16X 0.30

0.18

1.68 0.07

16X 0.5

0.3

1.0

0.8

(0.2) TYP

0.05

0.00

12X 0.5

1.5

A3.1

2.9 B

3.1

2.9

VQFN - 1 mm max heightRGT0016C

PLASTIC QUAD FLATPACK - NO LEAD

4222419/C 04/2021

PIN 1 INDEX AREA

0.08

SEATING PLANE

16 13

(OPTIONAL)

PIN 1 ID 0.1 C A B

0.05

EXPOSED

THERMAL PAD

SYMM

NOTES:

1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing

per ASME Y14.5M.

2. This drawing is subject to change without notice.

3. The package thermal pad must be soldered to the printed circuit board for thermal and mechanical performance.

SCALE 3.600

www.ti.com

EXAMPLE BOARD LAYOUT

0.07 MIN

ALL AROUND

0.07 MAX

ALL AROUND

16X (0.24)

16X (0.6)

( 0.2) TYP

VIA

12X (0.5)

(2.8)

(0.58)

TYP

( 1.68)

(R0.05)

ALL PAD CORNERS (0.58) TYP

VQFN - 1 mm max heightRGT0016C

PLASTIC QUAD FLATPACK - NO LEAD

4222419/C 04/2021

SYMM

LAND PATTERN EXAMPLE

SCALE:20X

NOTES: (continued)

4. This package is designed to be soldered to a thermal pad on the board. For more information, see Texas Instruments literature

number SLUA271 (www.ti.com/lit/slua271).

5. Vias are optional depending on application, refer to device data sheet. If any vias are implemented, refer to their locations shown

on this view. It is recommended that vias under paste be filled, plugged or tented.

SOLDER MASK

OPENING

METAL UNDER

SOLDER MASK

DEFINED

METAL

SOLDER MASK

OPENING

SOLDER MASK DETAILS

NON SOLDER MASK

DEFINED

(PREFERRED)

www.ti.com

EXAMPLE STENCIL DESIGN

16X (0.6)

16X (0.24)

12X (0.5)

(2.8)

( 1.55)

(R0.05) TYP

VQFN - 1 mm max heightRGT0016C

PLASTIC QUAD FLATPACK - NO LEAD

4222419/C 04/2021

NOTES: (continued)

6. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate

design recommendations.

SYMM

ALL AROUND

METAL

SOLDER PASTE EXAMPLE

BASED ON 0.125 mm THICK STENCIL

EXPOSED PAD 17:

85% PRINTED SOLDER COVERAGE BY AREA UNDER PACKAGE

SCALE:25X

SYMM

IMPORTANT NOTICE AND DISCLAIMER

TI PROVIDES TECHNICAL AND RELIABILITY DATA (INCLUDING DATA SHEETS), DESIGN RESOURCES (INCLUDING REFERENCE

DESIGNS), APPLICATION OR OTHER DESIGN ADVICE, WEB TOOLS, SAFETY INFORMATION, AND OTHER RESOURCES “AS IS”

AND WITH ALL FAULTS, AND DISCLAIMS ALL WARRANTIES, EXPRESS AND IMPLIED, INCLUDING WITHOUT LIMITATION ANY

IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT OF THIRD

PARTY INTELLECTUAL PROPERTY RIGHTS.

These resources are intended for skilled developers designing with TI products. You are solely responsible for (1) selecting the appropriate

TI products for your application, (2) designing, validating and testing your application, and (3) ensuring your application meets applicable

standards, and any other safety, security, regulatory or other requirements.

These resources are subject to change without notice. TI grants you permission to use these resources only for development of an

application that uses the TI products described in the resource. Other reproduction and display of these resources is prohibited. No license

is granted to any other TI intellectual property right or to any third party intellectual property right. TI disclaims responsibility for, and you

will fully indemnify TI and its representatives against, any claims, damages, costs, losses, and liabilities arising out of your use of these

resources.

TI’s products are provided subject to TI’s Terms of Sale or other applicable terms available either on ti.com or provided in conjunction with

such TI products. TI’s provision of these resources does not expand or otherwise alter TI’s applicable warranties or warranty disclaimers for

TI products.

TI objects to and rejects any additional or different terms you may have proposed. IMPORTANT NOTICE

Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265

Datenblatt für BQ24072T, 75T, 79T

INFORMATION

HILFE

KONTAKT

FOLGEN SIE UNS