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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 11

Cost-effective, low profile, high efficiency 42A supply powers AMD Hammer processors

Henry J. Zhang and Wei Chen

Abstract

The LTC3719, a low voltage, high current power supply, is described. The LTC3719 meets the AMD Hammer processor VRM requirement and allows low profile and high efficiency designs.

Keywords

LTC3719

AMD Hammer processor

Introduction

The new AMD Hammer processors require power supplies that can deliver more than 40A current at very low output voltages (0.8V to 1.55V). The LTC3719 PolyPhase controller meets these requirements. The LTC3719 is a current mode, 2-phase VID programmable controller that drives two synchronous buck stages 180 degrees out of phase of each other. The 2-phase architecture reduces ...

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