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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 114

1μA IQ synchronous boost converter extends battery life in portable devices

Goran Perica

Abstract

A 1μA IQ synchronous boost converter that extends battery life in portable devices is described.

Keywords

Synchronous boost converter

LTC1322

Introduction

Boost converters are regularly used in portable devices to produce higher output voltages from lower battery input voltages. Common battery configurations include two to three alkaline or NiMH cells or, increasingly, Li-Ion batteries, yielding a typical input voltage between 1.8V and 4.8V.

The 12V output converter shown in Figure 114.1 is designed to run from any typical small battery power source. This design centers around the LTC3122 boost converter, which can efficiently ...

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