ISL81401/ISL81401A/ISL81601 Synchronous Buck-Boost Controllers

Renesas’ ISL81401 and ISL81401A are 4-switch synchronous buck-boost controllers with peak and average current sensing and monitoring at both ends. The ISL81401 is a bidirectional device that can conduct current in both directions while the ISL81401A is a unidirectional device. The ISL81601 is a true bidirectional 4-switch synchronous buck-boost controller with peak and average current sensing and monitoring at both ends. Its wide input and output voltage ranges make it suitable for industrial, telecommunication, and after-market automotive applications.

The ISL81401, ISL81401A, and ISL81601 use the proprietary buck-boost control algorithm with valley current modulation for boost mode and peak current modulation for buck mode control.

Features

• Single inductor 4-switch buck-boost controller
• On-the-fly bidirectional operation with independent control of voltage and current on both ends
• Proprietary algorithm for smoothest mode transition
• MOSFET drivers with adaptive shoot-through protection
• Wide input voltage range: 4.5 V to 60 V
• Wide output voltage range: 0.8 V to 60 V
• Supports pre-biased output with SR soft-start
• Programmable frequency: 100 kHz to 600 kHz
• Supports parallel operation current sharing with cascade phase interleaving
• External sync with clock out or frequency dithering
• External bias for higher efficiency supports 8 V to 36 V input
• Output and input current monitor
• Selectable PWM mode operation between PWM/DE/Burst modes
• Accurate EN/UVLO and PGOOD indicator
• Low shut down current: 2.7 µA
• Complete protection: OCP, SCP, OVP, OTP, and UVP
  • Dual-level OCP protection with average current and pulse-by-pulse peak current limit
  • Selectable OCP response with either hiccup or constant current mode
  • Negative pulse-by-pulse peak current limit