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V

TT

LP2997

PV

IN

V

DDQ

V

REF

AV

IN

V

REF

=

0.9V

V

SENSE

GND

+

+

+

AV

IN

= 2.5V

V

TT

=0.9V

SD

SD

V

DDQ

= 1.8V

C

IN

C

OUT

C

REF

LP2997

www.ti.com

SNVS295F–MAY2004–REVISEDAPRIL2013

LP2997DDR-IITerminationRegulator

CheckforSamples:LP2997

1

FEATURES

DESCRIPTION

TheLP2997linearregulatorisdesignedtomeetthe

2

•SourceandSinkCurrent

JEDECSSTL-18specificationsforterminationof

•LowOutputVoltageOffset

DDR-IImemory.Thedevicecontainsahigh-speed

•NoExternalResistorsRequired

operationalamplifiertoprovideexcellentresponseto

loadtransients.Theoutputstagepreventsshoot

•LinearTopology

throughwhiledelivering500mAcontinuouscurrent

•SuspendtoRam(STR)Functionality

andtransientpeaksupto900mAintheapplicationas

•LowExternalComponentCount

requiredforDDR-IISDRAMtermination.TheLP2997

alsoincorporatesaV

SENSE

pintoprovidesuperior

•ThermalShutdown

loadregulationandaV

REF

outputasareferencefor

•AvailableinSOIC-8,SOPowerPAD-8Packages

thechipsetandDIMMs.

AnadditionalfeaturefoundontheLP2997isan

APPLICATIONS

activelowshutdown(SD)pinthatprovidesSuspend

•DDR-IITerminationVoltage

ToRAM(STR)functionality.WhenSDispulledlow

•SSTL-18Termination

theV

TT

outputwilltri-stateprovidingahigh

impedanceoutput,but,V

REF

willremainactive.A

powersavingsadvantagecanbeobtainedinthis

modethroughlowerquiescentcurrent.

TypicalApplicationCircuit

Figure1.TypicalApplicationCircuit

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2004–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Produktspecifikationer