The ISL85418 is a 800mA 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 ISL85418 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 forced PWM mode is needed. The ISL85418 switches at a default frequency of 500kHz; however, it can also be programmed using an external resistor from 300kHz to 2MHz. The ISL85418 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 ISL85418 provides an easy to implement design solution for a variety of applications while giving superior performance. The ISL85418 provides a very robust design for high-voltage industrial applications and an efficient solution for battery powered applications. The ISL85418 is available in a small Pb-free 4mmx3mm DFN plastic package with an operation temperature range 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 800mA
  • Internal or external soft-start
  • Minimal external components required
  • Power-good and enable functions available


  • Industrial control
  • Medical devices
  • Portable instrumentation
  • Distributed power supplies
  • Cloud infrastructure


Title language Type Format File Size Date
star ISL85418 Datasheet Datasheet PDF 2.32 MB
AN9208: High Frequency Power Converters Application Note PDF 592 KB
AN1965: Effectively Using the Intersil Small Form Factor Power Management Evaluation Boards Application Note PDF 2.35 MB
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
Doing More with Buck Regulator ICs White Paper PDF 1.07 MB
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
Power Management Solutions for Modern Electronic Devices 简体中文 White Paper PDF 337 KB
PCN20029A - Alternate bond wire material and assembly facility of the listed Renesas QFN packaged products Product Change Notice PDF 326 KB
PCN19005 - Product Improvement - Design Change for the Listed Renesas ISL854102*, ISL85410*, ISL85418* and RAA2124214* Products Product Change Notice PDF 226 KB
ISL85418 iSim:PE Model Schematic SXSCH 165 KB


select_allSoftware & 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

memoryBoards & Kits

Part Number Title Type Company
ISL85418DEMO1Z 800mA Synchronous Buck Regulator Demonstration Board Demonstration Renesas
ISL85418EVAL1Z Wide VIN 800mA Synchronous Buck Regulator Evaluation Board Evaluation Renesas