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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 159

Micropower buck/boost circuits: converting three cells to 3.3V

Mitchell Lee

Abstract

This Design Note presents four circuits capable of solving the dilemma of converting three cells to 3.3V. The LT1303 and LT1372 high efficiency DC/DC converters are used in the examples given.

Keywords

LT1303

LT1372

micropower buck/boost circuits

converting three cells to 3.3V

Two combinations of cell count and output voltage are to be strictly avoided: three cells converted to 3.3V and four cells converted to 5V. These combinations are troublesome because no ordinary regulator (boost, buck or linear) can accommodate a situation where the input voltage range overlaps the desired output voltage.

This design note presents four circuits capable ...

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