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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 104

Dual output regulator uses only one inductor

Carl Nelson

Abstract

A dual output regulator that uses only one inductor is discussed.

Keywords

Dual output regulator

Buck converter

LT1376

Many modern circuit designs still need a dual polarity supply. Communication and data acquisition are typical areas where both 5V and −5V are needed for some of the IC chips. It would be nice if a single switching regulator could supply both outputs with good regulation and a minimum of magnetic components. The circuit in Figure 104.1 is a good example of exploiting the best advantages of components and topologies to achieve a very small, dual output regulator with a single magnetic component.

Figure 104.1 Small, Efficient Circuit Design ...

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