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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 67

Efficient dual polarity output converter fits into tight spaces

Keith Szolusha

Abstract

LT1956- and LT3431-based dual polarity output converters that can provide power for ±5V loads with a single buck regulator are described.

Keywords

Buck regulator

Dual polarity output converter

LT1956

LT3431

Introduction

This design note describes a compact and efficient ±5V output dual polarity converter that uses a single buck regulator. The topology shown features 3mm maximum circuit height, high efficiency and low output voltage ripple on a 5V output—important considerations for many battery-powered, handheld and noise-sensitive devices. This combination of features is not easily achievable with other commonly used dual polarity topologies. ...

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