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LP3991

OUT

IN

1 PF

EN

GND

V

IN

Load

V

EN

B2

A2

A1

B1

C

OUT

*

C

IN

* For V

OUT

= 1.3 V or less,

C

OUT

may be reduced to 2.2 PF.

4.7 PF

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Reference

Design

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LP3991

SNVS296J–DECEMBER2006–REVISEDJUNE2016

LP3991300-mALDOforDigitalApplications

1

1Features

1

•InputVoltageFrom1.65Vto4V

•OutputVoltageFrom0.8Vto3V

•1%AccuracyatRoomTemperature

•125-mVDropoutat300-mALoad

•50-µAQuiescentCurrentat1-mALoad

•InrushCurrentControlledto600mA

•PSRR65dBat1kHz

•100-µsStart-UpTimefor1.5-VV

OUT

•StableWithCeramicCapacitorsasSmallas0402

•Thermal-OverloadandShort-CircuitProtection

2Applications

•PostDC-DCRegulator

•BatteryOperatedDevices

•Hand-HeldInformationAppliances

3Description

Operatingfromaminimuminputvoltageof1.65V,

theLP3991LDOhasbeendesignedtoprovidefixed

stableoutputvoltagesforloadcurrentsupto300mA.

Thisdeviceissuitablewhereaccuratelowvoltages

arerequiredfromlowinputvoltagesourcesandis

thereforesuitableforpostregulationofswitched

moderegulators.Insuchapplications,significant

improvementsinperformanceandEMIcanbe

realized,withlittlereductioninoverallefficiency.The

LP3991providesfixedoutputsaslowas1.2Vfroma

wideinputrangefrom1.65Vto4VUsingtheenable

(EN)pin,thedevicemaybecontrolledtoprovidea

shutdownstate,inwhichnegligiblesupplycurrentis

drawn.

TheLP3991isdesignedtobestablewithspace-

savingceramiccapacitorsassmallas0402case

size.

Performanceisspecifiedfora–40°Cto+125°C

junctiontemperaturerange.Foroutputvoltage

options,contactyourlocalTexasInstrumentssales

office.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(NOM)

LP3991DSBGA(4)1.43mm×0.96mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

space

space

space

TypicalApplicationCircuit

Produktspecifikationer