LP2997 datasheet(1/12 Pages) NSC

Nome de Peças	LP2997

Descrição Electrónicos	DDR-II Termination Regulator

PDF	12 Pages

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Fabricante Electrônico	NSC [National Semiconductor (TI)]

Página de início	http://www.national.com

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LP2997

DDR-II Termination Regulator

General Description

The LP2997 linear regulator is designed to meet the JEDEC

SSTL-18 specifications for termination of DDR-II memory.

The device contains a high-speed operational amplifier to

provide excellent response to load transients. The output

stage prevents shoot through while delivering 500mA con-

tinuous current and transient peaks up to 900mA in the

application as required for DDR-II SDRAM termination. The

LP2997 also incorporates a V

SENSE pin to provide superior

load regulation and a V

REF output as a reference for the

chipset and DIMMs.

An additional feature found on the LP2997 is an active low

shutdown (SD) pin that provides Suspend To RAM (STR)

functionality. When SD is pulled low the V

TT output will

tri-state providing a high impedance output, but, V

REF will

remain active. A power savings advantage can be obtained

in this mode through lower quiescent current.

Features

n

Source and sink current

n

Low output voltage offset

n

No external resistors required

n

Linear topology

n

Suspend to Ram (STR) functionality

n

Low external component count

n

Thermal Shutdown

n

Available in SO-8, PSOP-8 packages

Applications

n

DDR-II Termination Voltage

n

SSTL-18 Termination

Typical Application Circuit

20109418

June 2004

DS201094

www.national.com

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LP2997 Folha de dados(PDF) 1 Page - National Semiconductor (TI)

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