LDK715 Datasheet by STMicroelectronics

This is information on a product in full production.
April 2020 DocID026678 Rev 3 1/19
LDK715
High input voltage 85 mA LDO linear regulator
Datasheet
-
production data
Features
•4.3 V to 24 V input voltage
•Low-dropout voltage (500 mV typ. at 85 mA)
•Very low quiescent current (5 µA typ. at full
load)
•85 mA guaranteed output current
•Output voltages 3.3 V, 4.2 V and 5.0 V (other
versions available on request)
•Compatible with ceramic output capacitors
from 0.47 µF to 10 µF
•Internal current limit
•Packages: SOT23-5L and DFN8 3x3
•Temperature range: from -40 °C to 125 °C
Applications
•Mobile phones
•Industrial
•battery-powered systems
Description
The LDK715 is a high voltage, ultra low quiescent
current and low drop linear regulator capable of
providing an output current in excess of 85 mA.
The device operates over an input voltage range
from 4.3 V to 24 V, and it is stable with output
ceramic capacitors. Fault condition protection
includes short-circuit current limitation. The ultra
low quiescent current of 5 µA at full load makes it
highly suitable for low power applications and
battery-powered systems. The wide input voltage
range makes the LDK715 an ideal solution for low
power industrial applications. The LDK715 is
available in SOT23-5, or DFN8 3x3 - 8 leads.
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3x3
Table 1. Device summary
Order codes
Output voltage
SOT23-5L DFN8 3x3
LDK715M33R LDK715PU33R 3.3 V
LDK715M42R LDK715PU42R 4.2 V
LDK715M50R LDK715PU50R 5.0 V
www.st.com
Contents LDK715
2/19 DocID026678 Rev 3
Contents
1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1 External capacitor requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4.2 Power dissipation and junction temperature . . . . . . . . . . . . . . . . . . . . . . . 7
5 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7.1 SOT23-5L package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
7.2 DFN8 3x3 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
8 Packaging information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8.1 Tape and reel SOT23-5L . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8.2 Tape and reel DFN8 3x3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
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DocID026678 Rev 3 3/19
LDK715 Diagram
19
1 Diagram
Figure 1. Block diagram
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Pin configuration LDK715
4/19 DocID026678 Rev 3
2 Pin configuration
Figure 2. Pin connection (top view)
Table 2. Pin description for DFN8 3x3
Symbol Pin number Name and function
IN 1 Input voltage
NC 2, 3, 5, 6, 7 Not internally connected
GND 4 Common ground
OUT 8 Output voltage
Exp. pad Leave floating or connect to GND
Table 3. Pin description for SOT23-5L
Symbol Pin number Name and function
IN 4 Input voltage
NC 1.3 Not internally connected
GND 2 Common ground
OUT 5 Output voltage
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DocID026678 Rev 3 5/19
LDK715 Maximum ratings
19
3 Maximum ratings
Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these conditions is not implied.
Table 4. Absolute maximum ratings
Symbol Parameter Value Unit
V
IN
DC input voltage From -0.3 to 26 V
V
OUT
DC output voltage From -0.3 to V
IN
+0.3 V
I
OUT
Continuous output current According to package
power dissipation A
P
D(1), (2)
1. P
D
is based on an operating temperature of 25 °C or less. It must be derated according to the operating temperature.
2. The LDK715 has an internal constant current limit feature. Take care not to exceed the power dissipation ratings of the
package also during current limit and short-circuit events.
Maximum power dissipation, DFN package 2 W
Maximum power dissipation, SOT23-5L package 0.45
T
STG
Storage temperature range -65 to 150 °C
T
OP
Operating junction temperature range -40 to 125 °C
Table 5. Thermal data
Symbol Parameter SOT23-5L DFN8 Unit
R
thJA
Thermal resistance junction ambient 195 52 °C/W
Electrical characteristics LDK715
6/19 DocID026678 Rev 3
4 Electrical characteristics
T
J
= 25 °C, V
IN
= V
OUT(NOM)
+ 1 V, C
IN
= 0.1 µF, C
OUT
= 1 µF, I
OUT
= 1 mA, unless
otherwise specified
(a)
.
a. For V
OUT(NOM)
< 3.3 V, V
IN
= 4.3 V.
Table 6. Electrical characteristics
Symbol Parameter Test conditions Min. Typ. Max. Unit
V
IN
Operating input voltage I
OUT
= 85 mA, T
J
= -40 °C to 125 °C 4.3 - 24 V
I
OUT
Output current V
IN
= V
OUT(NOM)
+1 to 24 V, T
J
= -40 °C to 125 °C 0 - 85 mA
V
OUT
V
OUT
accuracy
(1)
T
J
= 25 °C -1 - +1 %
V
IN
= V
OUT(NOM)
+1 to 24 V, T
J
= - 40 °C to 125 °C -2 - +2
Δ
VOUT
Line regulation V
IN
= V
OUT(NOM)
+1 to 24 V to 24 V,
I
OUT
= 1 mA, T
J
= -40 °C to 125 °C - 0.001 0.004 %/V
Δ
VOUT
Load regulation I
OUT
= 100 µA to 85 mA,
T
J
= -40 °C to 125 °C - 0.002 0.003 %/mA
V
DROP
Drop output voltage
(2)
I
OUT
= 85 mA, T
J
= -40 °C to 125 °C - 500 1000 mV
e
N
Output noise voltage
(3)
200 Hz to 100 kHz, I
OUT
= 50 mA,
C
OUT
= 10 µF, T
J
=-40 °C to 125 °C - - 210 µV
RMS
SVR Supply voltage
rejection
V
IN
= V
OUT(NOM)
+1 V +/- V
RIPPLE,
V
RIPPLE
= 0.2 V,
I
OUT
= 1 mA, C
OUT
= 10 µF
f = 1 kHz - 38 - dB
T
J
= -40 °C to 125 °C f = 100 kHz - 57
I
Q
Quiescent current I
OUT
= 0 mA to 85 mA,
T
J
= -40 °C to 125 °C
- 5 7 µA
V
IN
= 24 V - - 8.5
I
SC
Short-circuit current V
OUT
= 0, T
J
= -40 °C to 125 °C
V
IN
= V
OUT(NOM)
+1 to 24 V 120 - - mA
T
ON
Turn on time
(4)
V
IN
= V
OUT(NOM)
+1 to 24 V, C
OUT
= 10 µF,
I
OUT
= 60 mA, T
J
= -40 °C to 125 °C - 0.7 - ms
C
OUT
Output capacitor Capacitance f = 100 kHz 0.47 - - µF
1. For V
OUT(NOM)
< 3.3 V, V
IN
= 4.3 V.
2. Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value.
3. Guaranteed by design.
4. Turn-on time is time measured between the input just exceeding 90% of its final value and the output voltage just reaching
95% of its nominal value.
DocID026678 Rev 3 7/19
LDK715 Electrical characteristics
19
4.1 External capacitor requirements
A 0.1 µF or a larger input bypass capacitor, connected between IN and GND and located
close to the device, is recommended. In this manner, the transient response and noise
rejection of the power supply, as a whole, improve. A higher value of the input capacitor may
be necessary if large, fast-rise-time load transients are present in the application and if the
device is several inches far from the power source.
The LDK715 requires an output capacitor connected between OUT and GND to stabilize the
internal control loop. Please refer to Figure 7. for the allowable output capacitance and ESR
combinations.
4.2 Power dissipation and junction temperature
For a reliable operation, junction temperature should not exceed 125 °C. This limits the
power dissipation the regulator can handle in any application. To guarantee that the junction
temperature is within acceptable limits, calculate the maximum allowable dissipation,
P
D(max)
, and the dissipation, P
D
, which must be less than or equal to P
D(max)
.
The maximum power dissipation limit is given by the following equation:
Equation 1
where:
T
JMAX
is the maximum allowable junction temperature
R
thJA
is the thermal resistance junction to ambient for the package
T
A
is the ambient temperature
The regulator dissipation is calculated by the following equation:
Equation 2
Power dissipation coming from quiescent current is negligible.
The ST715 features the internal current limit. During normal operation, it limits the output
current to approximately 350 mA. When the current limit engages, the output voltage scales
back linearly until the overcurrent condition ends. Do not exceed the power dissipation
ratings of the package.
P
D max( )
T
JMAX
T
A
–( ) R
thJA
⁄=
P
D
V
IN
V
out
–( ) I
out
×=
T0 V” .47MF
Typical application LDK715
8/19 DocID026678 Rev 3
5 Typical application
Figure 3. Application circuit
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DocID026678 Rev 3 9/19
LDK715 Typical performance characteristics
19
6 Typical performance characteristics
Figure 4. Output voltage vs. temperature Figure 5. Output voltage vs. input voltage
Figure 6. Dropout voltage vs. output current Figure 7. C
OUT
stability region
Figure 8. Supply voltage rejection vs. frequency Figure 9. Output noise voltage vs. frequency
V
IN
=V
OUT(NOM)
+1V
3.15
3.2
3.25
3.3
3.35
3.4
3.45
3.5
-50 0 50 100 150
Temp [°C]
V
OUT
[V]
I
OUT
=1mA
I
OUT
=85mA
V
IN
=V
OUT(NOM)
+1V
3.15
3.2
3.25
3.3
3.35
3.4
3.45
3.5
-50 0 50 100 150
Temp [°C]
V
OUT
[V]
I
OUT
=1mA
I
OUT
=85mA
V
IN
=V
OUT(NOM)
+1V
0
0.5
1
1.5
2
2.5
3
3.5
0 1 2 3 4 5 6
V
IN
[V]
V
OUT
[V]
V
IN
=V
OUT(NOM)
+1V
0
0.5
1
1.5
2
2.5
3
3.5
0 1 2 3 4 5 6
V
IN
[V]
V
OUT
[V]
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Typical performance characteristics LDK715
10/19 DocID026678 Rev 3
Figure 10. Quiescent current vs. input voltage Figure 11. Load transient
C
IN
= C
OUT
= 1 µF, V
EN
= V
IN
= 24 V, I
OUT
= from 1 mA
to 85 mA, t
R
= t
F
= 5 µS
Figure 12. Line transient Figure 13. Enable transient
C
OUT
= 1 µF; V
IN
= V
EN
= from 4.3 to 22 V; I
OUT
= 1 mA;
t
R
= t
F
= 5 µs
C
IN
= C
OUT
= 1 µF, V
EN
= V
IN
= 0 to 4.3 V, I
OUT
= 1 mA
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DocID026678 Rev 3 11/19
LDK715 Package information
19
7 Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK packages, depending on their level of environmental compliance. ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK is an ST trademark.
7.1 SOT23-5L package information
Figure 14. SOT23-5L package outline
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Package information LDK715
12/19 DocID026678 Rev 3
Figure 15. SOT23-5L recommended footprint (dimensions in mm)
Table 7. SOT23-5L package mechanical data
Symbol
Dimensions (mm)
Min. Typ. Max.
A 0.90 - 1.45
A1 0.00 - 0.15
A2 0.90 - 1.30
b 0.30 - 0.50
c 0.009 - 0.20
D 2.80 2.95 3.05
E 1.50 1.60 1.75
e - 0.95 -
H 2.60 2.80 3.00
L 0.30 - 0.60
q 0.00 - 8.00
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BOTTOM VIEW DZ PIN 1 ID 0, 44 0,23 5/2 PIN 7 ID 7 2 J 4 TOP VIEW EXPOSED PAD SEATING PLANE
DocID026678 Rev 3 13/19
LDK715 Package information
19
7.2 DFN8 3x3 package information
Figure 16. DFN8 3x3 package outline
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Package information LDK715
14/19 DocID026678 Rev 3
Figure 17. DFN8 3x3 recommended footprint
Table 8. DFN8 3x3 package mechanical data
Symbol
Dimensions (mm)
Min Typ Max.
A 0.80 0.90 1.00
A1 0.00 0.02 0.05
A3 - 0.20 -
b 0.25 0.30 0.35
D 2.85 3.00 3.15
D2 1.603 1.753 1.853
E 2.85 3.00 3.15
E2 1.345 1.495 1.595
e 0.00 0.65 -
L 0.30 0.40 0.50
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DocID026678 Rev 3 15/19
LDK715 Packaging information
19
8 Packaging information
8.1 Tape and reel SOT23-5L
Figure 18. SOT23-5L tape and reel drawing
Table 9. SOT23-5L tape and reel mechanical data
Symbol
Dimensions (mm)
Min. Typ. Max.
A - 180.00
C 12.80 13.00 13.20
D 20.20 - -
N 60.00 - -
T - - 14.40
Ao 3.13 3.23 3.33
Bo 3.07 3.17 3.27
Ko 1.27 1.37 1.47
Po 3.90 4.00 4.10
P 3.90 4.00 4.10
‘ . (Measured at hub} 12,4 M “515” 4 Ohms R0 3mm 0 K0 90‘ R025 DFNB 3x3 . was and me‘
Packaging information LDK715
16/19 DocID026678 Rev 3
8.2 Tape and reel DFN8 3x3
Figure 19. DFN8 3x3 tape and reel drawing
1. 10 sprocket hole pitch cumulative tolerance ±0.2.
2. Camber not to exceed 1 mm in 100 mm.
3. Material: PS + C.
4. A0 and B0 measured as indicated.
5. K0 measured from a plane on the inside bottom of the pocket to the top surface of the carrier.
6. Pocked position relative to sprocket hole measured as true position of pocket, not pocket hole.
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DocID026678 Rev 3 17/19
LDK715 Packaging information
19
Table 10. DFN8 3x3 tape and reel mechanical data
Symbol
Dimensions (mm)
Min. Typ. Max.
A - - 180.00
C 12.80 - 13.20
D 20.20 - -
N 60.00 - -
T - - 14.40
Ao - 3.30 -
Bo - 3.30 -
Ko - 1.10 -
Po - 4.00 -
P - 8.00 -
Revision history LDK715
18/19 DocID026678 Rev 3
9 Revision history
Table 11. Document revision history
Date Revision Changes
09-Jul-2014 1 Initial release.
28-Nov-2017 2
Updated Table 1 on page 1 (removed references to note 1. from
LDK715M33R, LDK715PU33R, and LDK715PU42R).
Added Figure 19 on page 16.
Minor modifications throughout document.
07-Apr-2020 3 Updated Table 2: Pin description for DFN8 3x3.
DocID026678 Rev 3 19/19
LDK715
19
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