LP2998MA+ National Semiconductor, LP2998MA+ Datasheet
LP2998MA+
Manufacturer Part Number
LP2998MA+
Description
Manufacturer
National Semiconductor
Specifications of LP2998MA+
Notes
NEW
Date_code
10+
© 2009 National Semiconductor Corporation
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
TT
output will tri-
REF
remains
LP2998
Features
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Applications
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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