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Copyright © 2016, Texas Instruments Incorporated

220 PF

36 

V

TT

LP2996A

PV

IN

V

DDQ

V

REF

AV

IN

V

REF

=

0.75 V

V

SENSE

GND

47 PF

+

+

V

DDQ

=

1.5 V

V

DD

=

2.5 V

V

TT

=

0.75 V

SDSD

0.01PF

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Reference

Design

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LP2996-N

,

LP2996A

SNOSA40K–NOVEMBER2002–REVISEDDECEMBER2016

LP2996-N,LP2996ADDRTerminationRegulator

1

1Features

1

•MinimumV

DDQ

:

–1.8V(LP2996-N)

–1.35V(LP2996A)

•SourceandSinkCurrent

•LowOutputVoltageOffset

•NoExternalResistorsRequiredforSettingOutput

Voltage

•LinearTopology

•SuspendtoRam(STR)Functionality

•StableWithCeramicCapacitorsWithAppropriate

ESR

•LowExternalComponentCount

•ThermalShutdown

2Applications

•LP2996-N:DDR1andDDR2TerminationVoltage

•LP2996A:DDR1,DDR2,DDR3,andDDR3L

TerminationVoltage

•FPGA

•IndustrialandMedicalPC

•SSTL-2andSSTL-3Termination

•HSTLTermination

3Description

TheLP2996-NandLP2996Alinearregulatorsare

designedtomeettheJEDECSSTL-2specifications

forterminationofDDR-SDRAM.Thedevicealso

supportsDDR2,whileLP2996AsupportsDDR3and

DDR3LVTTbusterminationwithV

DDQ

minimumof

1.35V.Thedevicecontainsahigh-speedoperational

amplifiertoprovideexcellentresponsetoload

transients.Theoutputstagepreventsshootthrough

whiledelivering1.5-Acontinuouscurrentand

transientpeaksupto3Aintheapplicationas

requiredforDDR-SDRAMtermination.TheLP2996-N

andLP2996AalsoincorporateaVSENSEpinto

providesuperiorloadregulationandaVREFoutput

asareferenceforthechipsetandDIMMs.

AnadditionalfeaturefoundontheLP2996-Nand

LP2996Aisanactive-lowshutdown(SD)pinthat

providesSuspendToRAM(STR)functionality.When

SDispulledlowtheVTToutputwilltri-stateproviding

ahighimpedanceoutput,butVREFremainsactive.A

powersavingsadvantagecanbeobtainedinthis

modethroughlowerquiescentcurrent.

TIrecommendstheLP2998andLP2998-Q1devices

forautomotiveapplicationsandDDRapplicationsthat

requireoperatingattemperaturesbelowzero.

WEBENCH

®

designtoolscanbeusedbyapplication

designerstogenerate,optimize,andsimlulate

applicationsusingtheLP2998andLP2998-Q1.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(NOM)

LP2996-NSOIC(8)4.90mmx3.90mm

LP2996-N,LP2996AWSON(8)4.90mmx3.90mm

LP2996-NWQFN(16)4.00mmx4.00mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

SimplifiedSchematic

Produktspecifikationer