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 optimize the inductor size while the strong gate driver delivers up to 20A for the buck-boost output.


  • Wide input range: 6V to 40V
  • High light-load efficiency in pulse skipping DEM operation
  • Programmable soft-start
  • Optional DEM/PWM operation
  • Optional CC/HICCUP OCP protection
  • Supports prebias output with soft-start
  • Power-good (PGOOD) indicator
  • OVP, OTP and UVP protection
  • Back biased from output to improve efficiency



  • Battery backup
  • Type-C power supply and chargers
  • Battery powered industrial applications
  • Aftermarket automotive
  • Redundant power supplies
  • Robots and drones
  • Medical equipment
  • Security surveillance


Type Title Date
Manual - Development Tools PDF 1.73 MB
Datasheet PDF 3.39 MB
2 items

Design & Development

Software & Tools

Software Downloads

Type Title Date
PCB Design Files ZIP 1005 KB
1 item
High Voltage Buck Boost Controller

ISL81601 is a true bidirectional 4-switch synchronous buck-boost controller for efficient DC-DC power conversion with peak and average current sensing and monitoring at both ends. It provides cycle-by-cycle current limit in both directions while in buck or boost mode, and generates point-of-load (POL) and voltage rail conversions with peak efficiency up to 99%. The controller uses a proprietary buck-boost algorithm that allows inherent peak current sensing for a robust design and produces the smoothest mode transitions between buck, boost and buck-boost. Its proprietary algorithm reduces low frequency ripple at Vout, ensuring minimal disturbances during line or load transients. The algorithm also ensures predictable ripple voltage under all conditions. The ISL81601 features multilayer overcurrent protection (OCP) that helps designers to design a charging/discharging circuit that ensures constant current operation for safe and reliable battery power applications. It is available in 32LD 5mmx5mm QFN and 38LD HTSSOP packages and provides full protection features such OVP, UVP, OTP and OCP. ISL81601 is a 4.5Vin~ 60Vin device and the ISL81401 is a 4.5Vin~40Vin device. The ISL81401A is a low cost unidirectional version of the ISL81401.