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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 174

A simple ultralow dropout regulator

Jim Williams

Abstract

The LT1431 shunt regulator is described, which offers a simple solution to applications requiring extremely low dropout over a range of output currents.

Keywords

LT1431

ultra-low dropout regulator

Linear voltage regulators with low dropout characteristics are a frequent requirement, particularly in battery powered applications. It is desirable to maintain regulation until the battery is almost entirely depleted. Regulator dropout limits significantly impact useful battery life, and as such should be minimized. Figure 174.1 shows dropout characteristics for a monolithic regulator, the LT1085. The <1.5V dropout performance is about twice as good as standard monolithic ...

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