The ISL854102 is a 1. 2A synchronous buck regulator with an input range of 3V to 40V. It provides an easy-to-use, high efficiency, low BOM count solution for a variety of applications. The ISL854102 integrates both high-side and low-side NMOS FETs and features a PFM mode for improved efficiency at light loads. This feature can be disabled if a forced PWM mode is needed. The ISL854102 switches at a default frequency of 500kHz; however, it can also be programmed using an external resistor from 300kHz to 2MHz. The ISL854102 has the ability to use internal or external compensation. By integrating both NMOS devices and providing internal configuration options, minimal external components are required, which reduces the BOM count and design complexity. With a wide VIN range and reduced BOM, the ISL854102 provides an easy to implement design solution for a variety of applications while giving superior performance. The ISL854102 provides a very robust design for high-voltage industrial applications and an efficient solution for battery powered applications. The ISL854102 is available in a small Pb-free 4mmx3mm DFN plastic package with a full-range industrial temperature of -40°C to +125°C.


  • Wide input voltage range: 3V to 40V
  • Synchronous operation for high efficiency
  • No compensation required
  • Integrated high-side and low-side NMOS devices
  • Selectable PFM or forced PWM mode at light loads
  • Internal fixed frequency (500kHz) or adjustable switching frequency (300kHz to 2MHz)
  • Continuous output current up to 1.2A
  • Internal or external soft-start
  • Minimal external components required
  • Power-good and enable functions available

Product Options

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

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
ISL854102 Datasheet Datasheet PDF 1.54 MB
User Guides & Manuals
ISL854102DEMO2Z User Guide Manual PDF 975 KB
ISL854102DEMO3Z User Guide Manual PDF 1.08 MB
ISL85410EVAL1Z, ISL854102EVAL1Z, ISL85418EVAL1Z User Guide Manual PDF 1.58 MB
ISL85410DEMO1Z, ISL854102DEMO1Z, ISL85418DEMO1Z User Guide Manual PDF 1.10 MB
Application Notes & White Papers
How to Reconfigure a Buck Converter for Multiple Outputs White Paper PDF 468 KB
Five Easy Steps to Create a Multi-Load Power Solution White Paper PDF 846 KB
AN9208: High Frequency Power Converters Application Note PDF 592 KB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
AN9210: A New Pspice Subcircuit For The Power MOSFET Featuring Global Temperature Options Application Note PDF 650 KB
AN9209: A Spice-2 Subcircuit Representation For Power MOSFETs Using Empirical Methods Application Note PDF 387 KB
AN7244: Understanding Power MOSFETs Application Note PDF 349 KB
PCN19005 - Product Improvement - Design Change for the Listed Renesas ISL854102*, ISL85410*, ISL85418* and RAA2124214* Products Product Change Notice PDF 226 KB
ISL854102DEMO3Z Design Files Design File ZIP 604 KB
ISL854102DEMO2Z Design Files Design File ZIP 1.06 MB

Boards & Kits

Part Number Title Type Company
ISL854102DEMO2Z Wide VIN 1.2A Synchronous Buck Regulator Demonstration Boards Demonstration Renesas
ISL854102DEMO3Z Wide VIN 1.2A Synchronous Buck Regulator Demonstration Boards Demonstration Renesas