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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 51

One IC generates three sub-2V power rails from a Li-Ion cell

Frank Lee

Abstract

The LTC3446, which combines a 1A synchronous buck regulator with two 300mA very low dropout (VLDO) linear regulators to provide up to three stepped-down output voltages from a single input voltage, is described.

Keywords

Power supply integration

Triple regulator

LTC3446

Introduction

Shrinking geometries in IC technology have pushed the operating voltages of today’s electronics well below 2V, presenting a number of design challenges. One common problem is the need for multiple supply voltages: for example, one voltage for a CPU core, another for I/O and still others for peripherals. Sensitive RF, audio and analog circuitry may require additional ...

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