Texas Instruments LP2989 Handleiding

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LP2989

SNVS083O–FEBRUARY2005–REVISEDMARCH2015

LP2989MicropowerandLow-Noise,500-mAUltraLow-DropoutRegulatorforUseWith

CeramicOutputCapacitors

1Features3Description

TheLP2989isafixed-output500-mAprecisionLDO

1

•2.1-Vto16-VInputVoltageRange

regulatordesignedforusewithceramicoutput

•2.5-Vto5-VFixedOutputVoltageOptions

capacitors.

•Ultra-LowDropoutVoltage

Outputnoisecanbereducedto18μV(typical)by

•500-mAContinuousOutputCurrent

connectinganexternal10-nFcapacitortothebypass

•VeryLowOutputNoiseWithExternalCapacitor

pin.

•<0.8-µAQuiescentCurrentWhenShutdown

UsinganoptimizedVerticallyIntegratedPNP(VIP)

•LowGroundPinCurrentatAllLoads

process,theLP2989deliverssuperiorperformance:

•DropoutVoltage:Typically310mVat500-mA

•0.75%OutputVoltageAccuracy(AGrade)

load,and1mVat100-µAload.

•HighPeakCurrentCapability(800-mAtypical)

•GroundPinCurrent:Typically3mAat500-mA

•OvertemperatureandOvercurrentProtection

load,and110µAat100-µAload.

•−40°Cto125°CJunctionTemperatureRange

•SleepMode:TheLP2989drawslessthan0.8-µA

quiescentcurrentwhenSHUTDOWNpinispulled

2Applications

low.

•NotebooksandDesktopPCs

•ErrorFlag:Thebuilt-inerrorflaggoeslowwhen

theoutputdropsapproximately5%below

•PDAsandPalmtopComputers

nominal.

•WirelessCommunicationPins

•PrecisionOutput:Outputvoltageaccuracyis

•SMPSPost-Regulators

0.75%(Agrade)and1.25%(standardgrade)at

roomtemperature.

Foroutputvoltages<2V,seeLP2989LV(SNVS086)

datasheet.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(NOM)

WSON(8)4.00mmx4.00mm

LP2989SOIC(8)4.90mmx3.91mm

VSSOP(8)3.00mmx3.00mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

TypicalApplication

*Capacitancevaluesshownareminimumrequiredtoassurestability,butmaybeincreasedwithoutlimit.Larger

outputcapacitorprovidesimproveddynamicresponse.SeetheOutputCapacitorsection.

**Shutdownmustbeactivelyterminated(seetheShutdownInputOperationsection).TietoIN(pin4)ifnotuse.

1

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

Product specificaties