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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 75

60V step-down DC/DC converter maintains high efficiency

Mark W. Marosek

Abstract

The LT1766, a 1.5A monolithic buck switching regulator, is described.

Keywords

Monolithic buck switching regulator

LT1766

Introduction

Monolithic step-down converters capable of operation at high input voltages are usually optimized for efficiency at high input-to-output voltage differentials. At such low duty cycle operation where DC switch losses are less critical, the switch design is often neglected, resulting in a switch resistance that (for some 1.5A converters) can be as poor as 1Ω. Such converters sacrifice efficiency when lower input-to-output voltage differentials are required. The switch drop can also limit maximum duty cycle—putting ...

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