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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 106

Ultralow power, high efficiency DC/DC converter operates outside the audio band

Mitchell Lee

Abstract

The LTC1174, a step-down converter that is designed specifically to eliminate noise at audio frequencies while maintaining high efficiency at low output currents, is described.

Keywords

DC/DC converter

LTC1174

Portable communications products are densely packed with signal processing, microprocessor, radio frequency, and audio circuits. Digital clock noise must be eliminated not only from the audio sections, but also from the antenna which, by the very nature of the product, is located only inches from active circuitry. If a switching regulator is used in the power supply, it becomes another source of noise. The LTC1174 ...

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