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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 153

Buck-boost controller simplifies design of DC/DC converters for handheld products

David Burgoon

Abstract

A buck-boost controller that simplifies the design of DC/DC converters for handheld products is described.

Keywords

Buck-boost controller

DC/DC converter

LTC3785

Introduction

A number of conventional solutions have been available for the design of a DC/DC converter where the output voltage is within the input voltage range—a common scenario in Li-Ion battery-powered applications—but none were very attractive until now. Conventional topologies, such as SEPIC or boost followed by buck, have numerous disadvantages, including low efficiency, complex magnetics, polarity inversion and/or circuit complexity/cost. The LTC3785 ...

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