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LP2997MRX Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer LP2997MRX
Beschreibung DDR-II Termination Regulator
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 12 Seiten
LP2997MRX Datasheet, Funktion
June 2004
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 VSENSE pin to provide superior
load regulation and a VREF 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 VTT output will
tri-state providing a high impedance output, but, VREF 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
© 2004 National Semiconductor Corporation DS201094
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LP2997MRX Datasheet, Funktion
Typical Performance Characteristics (Continued)
Iq vs AVIN Temperature
Maximum Sourcing Current vs AVIN
(VDDQ = 1.8V, PVIN = 1.8V)
20109428
Maximum Sinking Current vs AVIN
(VDDQ = 1.8V)
20109435
20109436
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LP2997MRX pdf, datenblatt
Notes
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