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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 107

Triple output 3.3V, 5V, and 12V high efficiency notebook power supply

Randy G. Flatness

Abstract

A triple output 3.3V, 5V, and 12V high efficiency notebook power supply is described.

Keywords

Step-down switching regulator

LTC1142

LTC1142HV

The new LTC1142 is a dual 5V and 3.3V synchronous step-down switching regulator controller featuring automatic Burst Mode operation to maintain high efficiencies at low output currents. Two independent regulator sections, each driving a pair of complementary MOSFETs, may be shut down separately to less than 20μA/output. This feature is an absolute necessity to maximize battery life in portable applications. Additionally, the input voltage to each regulator section can be individually connected ...

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