Chapter 7

SOT-23 SMBus fan speed controller extends battery life and reduces noise

David Canny

Abstract

The LTC1695, which improves battery run times and reduces acoustic noise in portable equipment, is described.

Keywords

LTC1695

SOT-23 SMBus fan speed controller

Battery run time

Introduction

Battery run times for notebook computers and other portable devices can be improved and acoustic noise reduced by using Linear Technology’s LTC1695 to optimize the operation of these products’ internal cooling fans. The LTC1695 comes in a SOT-23 package and provides all the functions necessary for a system controller or microcontroller to regulate the speed of a typical 5V/≤1W fan via a 2-wire SMBus interface.

By varying the fan speed according ...

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