Overview

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.

ISL85418 Functional Diagram
ISL85418 Functional Diagram
  • 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

Applications

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

Documentation

Design & Development

Software & Tools
iSim:PE Offline Simulation Tool
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.
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ISL85418 iSim:PE Model
 Simulator Renesas
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ISL85418DEMO1Z Buck Regulator Demonstration Board

ISL85418DEMO1Z

Demonstration
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800mA Synchronous Buck Regulator Demonstration Board

The ISL85418DEMO1Z board is intended for use in point-of-load applications sourcing from 3V to 40V. The board is used to demonstrate the performance of the ISL85418...

Featured Documents:
ISL85410DEMO1Z, ISL854102DEMO1Z, ISL85418DEMO1Z User Guide
ISL8541xEVAL1Z Synchronous Buck Regulator Eval Board

ISL85418EVAL1Z

Evaluation
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Wide VIN 800mA Synchronous Buck Regulator Evaluation Board

The ISL85418EVAL1Z evaluation kit is intended for use for point-of-load applications sourcing from 3V to 40V.

The ISL85418 wide VIN, low quiescent current,...

Featured Documents:
ISL85410EVAL1Z, ISL854102EVAL1Z, ISL85418EVAL1Z User Guide

ECAD Models

Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on products in the Product Options table. If a symbol or model isn't available, it can be requested directly from the website.

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Product Options

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    ISL85418FRZ
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    		DFN Tube 3 1.237 Get Samples,
    ISL85418FRZ-T
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    		 DFN Reel 3 Get Samples,
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