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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 30

Achieving microamp quiescent current in switching regulators

Jim Williams

Abstract

Methods for Aachieving microamp quiescent current in switching regulators are discussed.

Keywords

Flyback regulator

LT1070

Many battery-powered applications require very wide ranges of power supply output current. Normal conditions require currents in the ampere range, while standby or “sleep” modes draw only microamperes. A typical laptop computer may draw 1 to 2amperes running while needing only a few hundred microamps for memory when turned off. In theory, any switching regulator designed for loop stability under no-load conditions will work. In practice, a regulator’s relatively large quiescent current may cause unacceptable battery drain ...

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