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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 142

Dual controller provides 2μs step response and 92% efficiency for 1.5V rails

Mike Shriver

Abstract

The LTC3838 is described. It is a dual output buck controller ideal for applications that require a fast load step response, high switching frequency, high efficiency and accurate output voltages.

Keywords

Buck controller

Dual output

LTC3838

Introduction

The LTC3838 is a dual output, dual phase buck controller that employs a controlled constant on-time, valley current mode architecture to provide fast load step response, high switching frequency and low duty cycle capability. The switching frequency range is 200kHz to 2MHz—its phase-locked loop keeps the frequency constant during steady-state operation and can be synchronized ...

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