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
Applications
- Battery backup
- UPS/storage systems
- Battery powered industrial applications
- Renewable energy
- Aftermarket automotive
- Redundant power supplies
- Robot and drones
- Medical equipment
- Building and industrial automation
- Security surveillance