The ISL8117A is a synchronous buck controller to generate POL voltage rails and bias voltage rails for a wide variety of applications in industrial and general purpose segments. Its wide input and output voltage ranges make it suitable for telecommunication and after-market automotive applications. ISL8117A is a derivative from the ISL8117 by replacing its CLKOUT pin with COMP pin to provide flexibility to customers to configure the voltage loop compensation externally.

The ISL8117A uses the valley current modulation technique to bring hassle-free power supply design with a minimal number of components and complete protection from unwanted events. The ISL8117A offers programmable soft-start and enable functions along with a power-good indicator for ease of supply rail sequencing and other housekeeping requirements. In ideal situations, a complete power supply circuit can be designed with 10 external components and provide OV/OC/OT protections in a space conscious 16 Ld 4 × 4 mm QFN package. The package uses an EPAD to improve thermal dissipation and noise immunity. Low pin count, less number of external components and default internal values, makes the ISL8117A an ideal solution for quick to market simple power supply designs. The ISL8117A utilizes single resistor settings for other functions such as operating frequency and overcurrent protection. Its current mode control with VIN feed-forward enables it to cover various applications. The unique DEM/Skipping mode at light load dramatically lowers standby power consumption with consistent output ripple over different load levels.


  • Wide input voltage range: 4.5V to 60V
  • Wide output voltage range: 0.6V to 54V
  • Light-load efficiency enhancement
    • Low ripple Diode Emulation mode with pulse skipping
  • Programmable soft-start
  • Supports prebiased output with SR soft-start
  • Programmable frequency: 100kHz to 2MHz
  • External sync
  • PGOOD indicator
  • Forced PWM
  • Adaptive shoot-through protection
  • No external current sense resistor
    • Use lower MOSFET rDS(ON)
  • Functional pins with default design values
  • Complete protection
  • Overcurrent, overvoltage, over-temperature, undervoltage
  • Pb-free (RoHS compliant)


  • PLC and factory automation
  • Industrial equipment
  • Security surveillance
  • Server and data centers
  • Switcher and routers
  • Telecom and datacom
  • LED panels

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active QFN Tube 75
Active QFN Reel 6000
Active QFN Reel 250

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
ISL8117A Datasheet Datasheet PDF 1.41 MB
Application Notes & White Papers
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
How to Select a PWM Controller for Narrow On-Time Buck Conversion 简体中文 White Paper PDF 322 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
ISL8117A 12Vin 1.2V 5A 500kHz iSim:PE Model Schematic SXSCH 216 KB
ISL8117 48Vin 12V 20A iSim:PE Model Schematic SXSCH 190 KB

Software & Tool Pages

Title Type Description Company
iSim:PE Offline Simulation Tool Simulator iSim Personal Edition (iSim:PE) speeds the design cycle and reduces risk early in any project, identifying parts that can be used in current as well as next-generation designs. Renesas

Boards & Kits

Part Number Title Type Company
ISL8117ADEMO1Z Synchronous Step-down PWM Controller Demonstration Board Demonstration Renesas
ISL8117ADEMO4Z Synchronous Step-down PWM Controller Demonstration Board Demonstration Renesas
ISL8117AEVAL1Z Synchronous Step-down PWM Controller Evaluation Board Evaluation Renesas
ISL8117AEVAL2Z Synchronous Step-down PWM Controller Evaluation Board Evaluation Renesas
ISL8117A-LDEMO2Z Synchronous Step-down PWM Controller Demonstration Board Demonstration Renesas