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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 227

Step-down charge pumps are tiny, efficient and very low noise

William Walter

Abstract

The LTC3250-1.5 switched capacitor step-down DC/DC converter, which squeezes into the tightest spaces while providing 1.5V at 250mA from a single 3.1V to 5.5V supply, is described.

Keywords

Step-down charge pump

LTC3251

LTC3250

Introduction

Inductorless charge pump DC/DC converters are popular in space-constrained applications with 10mA to 500mA load currents. Such converters are available in small packages, operate with very low quiescent current and require minimal external components. However, the downside for most charge pumps is noise. Noise that is generated at the power input can interfere with RF transmission and reception in ...

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