LP2998MA+ National Semiconductor, LP2998MA+ Datasheet

LP2998MA+

Manufacturer Part Number

LP2998MA+

Description

Manufacturer

National Semiconductor

Datasheets

1.LP2998MA.pdf (18 pages)

2.LP2998MAX.pdf (18 pages)

Specifications of LP2998MA+

Notes

NEW

Date_code

10+

Current page: 1 of 18
Download datasheet (360Kb)

DDR-I and DDR-II Termination Regulator

General Description

The LP2998 linear regulator is designed to meet JEDEC

SSTL-2 and JEDEC SSTL-18 specifications for termination of

DDR1-SDRAM and DDR-II memory. The device contains a

high-speed operational amplifier to provide excellent re-

sponse to load transients. The output stage prevents shoot

through while delivering 1.5A continuous current as required

for DDR1-SDRAM termination, and 0.5A continuous current

as required for DDR-II termination. The LP2998 also incor-

porates a V

a V

An additional feature found on the LP2998 is an active low

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

functionality. When SD is pulled low, the V

state providing a high impedance output, while V

active. A power savings advantage can be obtained in this

mode through lower quiescent current.

Typical Application Circuit

REF

output as a reference for the chipset and DIMMs.

SENSE

pin to provide superior load regulation and

300269

output will tri-

REF

remains

LP2998

Features

■

Applications

■

Source and sink current

Low output voltage offset

No external resistors required

Linear topology

Suspend to Ram (STR) functionality

Low external component count

Thermal Shutdown

Available in SO-8, PSOP-8 packages

DDR-I and DDR-II Termination Voltage

SSTL-18 Termination

SSTL-2 and SSTL-3 Termination

HSTL Termination

30026918

www.national.com

May 26, 2009

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