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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 4

Wide input range, high efficiency DDR termination power supply achieves fast transient response

Wei Chen

Abstract

The LTC3717 DDR termination power supply, which achieves high efficiency and fast load transient response for high input applications, is described. The LTC3718 and LTC3831 are also considered.

Keywords

Tracking controller

LTC3717

LTC3718

LTC3831

Introduction

Today’s complicated computing and communication systems demand high system memory bandwidths. The emerging standard is double data rate (DDR) memory because of its higher data rate and relatively low cost. A typical DDR memory system needs at least two main power supplies: VDD for the I/O power and VTT for the termination power. To ensure good signal quality ...

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