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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 208

Single inductor, tiny buck-boost converter provides 95% efficiency in lithium-ion to 3.3V applications

Mark Jordan

Abstract

A single inductor, tiny buck-boost converter that provides 95% efficiency in lithium-ion to 3.3V applications is described.

Keywords

Buck-boost converter

lithium-ion cell

LTC3440

Introduction

In portable applications powered by a single lithium-ion cell, the input voltage can typically change from 4.2V initially, down to 2.5V at end of life. It is a challenging task to provide a regulated voltage within the range of the battery. Until now, the most popular solution has been the SEPIC converter, but its mediocre efficiency and requirement of both a coupled inductor and a high current flyback capacitor ...

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