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

tuneProduct Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active QFN Tube 60
Availability
Active QFN Reel 6000
Availability
Active QFN Reel 250
Availability

descriptionDocumentation

Title language Type Format File Size Date
Datasheets & Errata
star ISL81401, ISL81401A Datasheet Datasheet PDF 2.11 MB
User Guides & Manuals
ISL81401AEVAL1Z User Guide Manual - Development Tools PDF 1.73 MB
Application Notes & White Papers
Design Considerations for a Bidirectional DC/DC Converter 日本語, 简体中文 White Paper PDF 759 KB
Achieve up to 99% Efficiency in a Robust Battery Backup System Using a True Bidirectional Buck-Boost Controller 日本語, 简体中文 White Paper PDF 351 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB

file_downloadDownloads

Title language Type Format File Size Date
Hardware
ISL81401AEVAL1Z Design Files PCB Design Files ZIP 1005 KB

memoryBoards & Kits

Part Number Title Type Company
ISL81401AEVAL1Z 40V Synchronous Buck-Boost Controller Evaluation Board Evaluation Renesas