Analog Circuit Design Volume Three

Chapter 152

High efficiency 4-switch buck-boost controller provides accurate output current limit

Tage Bjorklund

Abstract

A high efficiency 4-switch buck-boost controller that provides accurate output current limit is described.

Keywords

Buck-boost controller

LTC3789

Introduction

A 4-switch buck-boost converter (Figure 152.1) is often a better alternative to a transformer-based topology when a converter’s input voltage can be above or below the regulated output voltage and isolation is not required. A buck-boost converter provides a wider input voltage range, better efficiency and has no need of a bulky transformer. A buck-boost converter is much more efficient than a comparable SEPIC converter.

Figure 152.1 4-Switch Buck-Boost ...