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BYPASS

LP3985

INOUT

EN

3(A1)

5(C1)

4(A3)

2(B2)

1µF

1(C3)

*

1µF

Pin Numbers in parenthesis indicate DSBGA package.

* Optional Noise Reduction Capacitor.

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LP3985

SNVS087AE–OCTOBER2000–REVISEDMAY2015

LP3985Micropower,150-mALow-NoiseUltra-Low-DropoutCMOSVoltageRegulator

1Features3Description

TheLP3985isdesignedforportableandwireless

1

•InputVoltage:2.5Vto6V

applicationswithdemandingperformanceandspace

•100-mVMaximumDropoutwith150-mALoad

requirements.LP3985performanceisoptimizedfor

•150-mAVerifiedOutput

battery-poweredsystemstodeliverultralownoise,

extremelylowdropoutvoltage,andlowquiescent

•50-dBPSRRat1kHzatV

IN

=V

OUT

+0.2V

current.Regulatorgroundcurrentincreasesonly

•≤1.5-μAQuiescentCurrentwhenShutDown

slightlyindropout,furtherprolongingthebatterylife.

•FastTurn-Ontime:200μs(typ.)

TheLP3985isstablewithasmall1-µF±30%

•30-μV

RMS

OutputNoise(typical)over10Hzto100

ceramicorhigh-qualitytantalumoutputcapacitor.The

kHz

DSBGArequiresthesmallestpossiblePCboardarea

•−40°Cto125°CJunctionTemperatureRangefor

-thetotalapplicationcircuitareacanbelessthan2

Operation

mmx2.5mm,afractionofa1206casesize.

•2.5-V,2.6-V,2.7-V,2.8-V,2.85-V,2.9-V,3-V,3.1-

Anoptionalexternalbypasscapacitorreducesthe

V,3.2-V,3.3-V,4.7-V,4.75-V,4.8-Vand5-V

outputnoisewithoutslowingdowntheloadtransient

OutputsStandard

response.Faststartuptimeisachievedbyutilizingan

internalpower-oncircuitthatactivelypre-chargesthe

•LogicControlledEnable

bypasscapacitor.

•StablewithCeramicandHigh-QualityTantalum

Powersupplyrejectionisbetterthan50dBatlow

Capacitors

frequenciesandstartstorolloffat1kHz.Highpower

•FastTurnon

supplyrejectionismaintaineddowntolowinput

•ThermalShutdownandShort-CircuitCurrentLimit

voltagelevelscommontobatteryoperatedcircuits.

Thedeviceisidealformobilephoneandsimilar

2Applications

battery-poweredwirelessapplications.Itprovidesup

•CDMACellularHandsets

to150mA,froma2.5-Vto6-Vinput.TheLP3985

consumeslessthan1.5µAindisablemodeandhas

•WidebandCDMACellularHandsets

fastturn-ontimelessthan200µs.

•GSMCellularHandsets

TheLP3985isavailablewithfixedoutputvoltages

•PortableInformationAppliances

from2.5Vto5V.ContactTexasInstrumentsSales

space

forspecificvoltageoptionneeds.

SimplifiedSchematic

DeviceInformation

(1)

PART

PACKAGEBODYSIZE

NUMBER

DSBGA(5)1.502mmx1.045mm(MAX)

LP3985

SOT-23(5)2.90mmx1.60mm(NOM)

(1)Forallavailablepackages,seethePackageOption

Addendumattheendofthedatasheet.

1

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

Product specificaties