Overview
Description
The ISL81401 and ISL81401A are 4-switch synchronous buck-boost controller 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 an unidirectional device. The ISL81401 and ISL81401A use the proprietary buck-boost control algorithm with valley current modulation for Boost mode and peak current modulation for Buck mode control. The ISL81401 and ISL81401A have four independent control loops for input and output voltages and currents. Inherent peak current sensing at both ends and cycle-by-cycle current limit of this family of products ensures high operational reliability by providing instant current limit in fast transient conditions at either ends and in both directions. It also has two current monitoring pins at both input and output to facilitate Constant Current (CC) limit and other system management functions. CC operation down to low voltages avoids any runaway condition at over load or short-circuit conditions. In addition to multilayer overcurrent protection, it also provides full protection features such as OVP, UVP, OTP, and average and peak current limit on both input and output to ensure high reliability in both unidirectional and bidirectional operation. The IC is packaged in a space conscious 32 Ld 5mmx5mm QFN package to improve thermal dissipation and noise immunity. The unique DE/Burst mode at light-load dramatically lowers standby power consumption with consistent output ripple over different load levels.
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: 4.5V to 40V
- Wide output voltage range: 0.8V to 40V
- Supports pre-biased output with SR soft-start
- Programmable frequency: 100kHz to 600kHz
- Supports parallel operation current sharing with cascade phase interleaving
- External sync with clock out or frequency dithering
- External bias for higher efficiency supports 5V - 36V input
- Output and input current monitor
- Selectable PWM mode operation between PWM/DE/Burst modes
- Accurate EN/UVLO and PGOOD indicator
- Low shutdown current: 2.7µA
- 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
Comparison
Applications
Documentation
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Type | Title | Date |
Datasheet | PDF 3.39 MB | |
White Paper | PDF 759 KB 日本語 , 简体中文 | |
White Paper | PDF 351 KB 日本語 , 简体中文 | |
Application Note | PDF 509 KB | |
Application Note | PDF 397 KB | |
5 items
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Design & Development
Software & Tools
Boards & Kits
40V Synchronous Buck-Boost Controller Evaluation Board with 6V to 40V Vin range and 12V 8A Output
The ISL81401AEVAL1Z evaluation board features the ISL81401A, a 40V high voltage synchronous buck-boost controller that offers external soft-start, independent enable functions, and integrates UV/OV/OC/OT protections. A programmable switching frequency ranging from 100kHz to 600kHz helps to...
USB PD with Turbo Boost Development Kit
The USB PD with Turbo Boost Development Kit is used for developing applications with Universal Serial Bus Power Delivery (USB PD). The kit utilizes Renesas' R9A02G011 USB PD 3.0 controller, ISL81401 bidirectional buck-boost voltage regulator, and ISL9238 battery charger controller. The input...
Test this Board Remotely
ROS-Based Robot Body Controller Reference Design
This reference design allows for the control of multiple servos using the Robot Operating System (ROS). Our RA6M5 MCU, featuring the high-performance Arm® Cortex®-M33, integrates communication interfaces like Ethernet and USB for seamless Pub/Sub messaging between ROS nodes. By utilizing our
Models
ECAD Models
Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.

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