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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 273

Pushbutton on/off controller simplifies system design

Victor Fleury

Abstract

A pushbutton on/off controller that simplifies system design is described.

Keywords

On/off pushbutton

de-bounce

LTC2950

LTC2951

Introduction

Handheld designers often grapple with ways to de-bounce and control the on/off pushbutton of portable devices. Traditional de-bounce designs use discrete logic, flip-flops, resistors and capacitors. Other designs include an onboard microprocessor and discrete comparators which continuously consume battery power. For high voltage multicell battery applications, a high voltage LDO is needed to drive the low voltage devices. All this extra circuitry not only increases required board space and design complexity, ...

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