LP2981IM5X-3.3资料

LP2981Micropower100mAUltraLow-DropoutRegulatorMarch2000

LP2981

Micropower100mAUltraLow-DropoutRegulator

GeneralDescription

TheLP2981isa100mA,fixed-outputvoltageregulatorde-signedspecificallytomeettherequirementsofbattery-poweredapplications.

UsinganoptimizedVIP™(VerticallyIntegratedPNP)pro-cess,theLP2981deliversunequaledperformanceinallspecificationscriticaltobattery-powereddesigns:

DropoutVoltage.Typically200mV@100mAload,and7mV@1mAload.

GroundPinCurrent.Typically600µA@100mAload,and80µA@1mAload.

SleepMode.Lessthan1µAquiescentcurrentwhenON/OFFpinispulledlow.

SmallestPossibleSize.SOT-23andmicroSMDpackagesuseanabsoluteminimumboardspace.

PrecisionOutput.0.75%toleranceoutputvoltagesavail-able(Agrade).

Elevenvoltageoptions,from2.5Vto5.0V,areavailableasstandardproducts.

Features

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Ultralowdropoutvoltage

Outputvoltageaccuracy0.75%(AGrade)Guaranteed100mAoutputcurrent

Smallestpossiblesize(SOT-23,microSMDpackage)<1µAquiescentcurrentwhenshutdownLowgroundpincurrentatallloadcurrentsHighpeakcurrentcapability(300mAtypical)Widesupplyvoltagerange(16Vmax)FastdynamicresponsetolineandloadLowZOUToverwidefrequencyrangeOvertemperature/overcurrentprotection

−40˚Cto+125˚Cjunctiontemperaturerange

Applications

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CellularPhone

Palmtop/LaptopComputer

PersonalDigitalAssistant(PDA)

Camcorder,PersonalStereo,Camera

BlockDiagram

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VIP™isatrademarkofNationalSemiconductorCorporation.

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LP2981ConnectionDiagrams

5-LeadSmallOutlinePackage(M5)

microSMD,5BumpPackage(BPA05)

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TopView

SeeNSPackageNumberMF05AFororderinginformationseeTable1BottomView

SeeNSPackageNumberBPA05

OrderingInformation

TABLE1.PackageMarkingandOrderInformation

OutputVoltage

(V)

2.52.52.52.52.72.72.72.72.82.82.82.82.92.92.92.93.03.03.03.03.13.13.13.13.23.23.23.23.33.33.33.3

Grade

OrderInformation

PackageMarkingL0CAL0CAL0CBL0CBL0DAL0DAL0DBL0DBL77AL77AL77BL77BL0VAL0VAL0VBL0VBL05AL05AL05BL05BL38AL38AL38BL38BL35AL35AL35BL35BL04AL04AL04BL04B

Suppliedas:

5-LeadSmallOutlinePackage(M5)

AASTDSTDAASTDSTDAASTDSTDAASTDSTDAASTDSTDAASTDSTDAASTDSTDAASTDSTD

LP2981AIM5X-2.5LP2981AIM5-2.5LP2981IM5X-2.5LP2981IM5-2.5LP2981AIM5X-2.7LP2981AIM5-2.7LP2981IM5X-2.7LP2981IM5-2.7LP2981AIM5X-2.8LP2981AIM5-2.8LP2981IM5X-2.8LP2981IM5-2.8LP2981AIM5X-2.9LP2981AIM5-2.9LP2981IM5X-2.9LP2981IM5-2.9LP2981AIM5X-3.0LP2981AIM5-3.0LP2981IM5X-3.0LP2981IM5-3.0LP2981AIM5X-3.1LP2981AIM5-3.1LP2981IM5X-3.1LP2981IM5-3.1LP2981AIM5X-3.2LP2981AIM5-3.2LP2981IM5X-3.2LP2981IM5-3.2LP2981AIM5X-3.3LP2981AIM5-3.3LP2981IM5X-3.3LP2981IM5-3.3

3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel

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LP2981OrderingInformation

OutputVoltage

(V)

3.63.63.63.63.83.83.83.84.04.04.04.04.74.74.74.75.05.05.05.02.52.52.52.53.23.23.23.23.33.33.33.3

Grade

(Continued)

TABLE1.PackageMarkingandOrderInformation(Continued)

OrderInformation

PackageMarkingL0JAL0JAL0JBL0JBL36AL36AL36BL36BL0ZAL0ZAL0ZBL0ZBL0GAL0GAL0GBL0GBL03AL03AL03BL03B

Suppliedas:

5-LeadSmallOutlinePackage(M5)

AASTDSTDAASTDSTDAASTDSTDAASTDSTDAASTDSTDAASTDSTDAASTDSTDAASTDSTD

LP2981AIM5X-3.6LP2981AIM5-3.6LP2981IM5X-3.6LP2981IM5-3.6LP2981AIM5X-3.8LP2981AIM5-3.8LP2981IM5X-3.8LP2981IM5-3.8LP2981AIM5X-4.0LP2981AIM5-4.0LP2981IM5X-4.0LP2981IM5-4.0LP2981AIM5X-4.7LP2981AIM5-4.7LP2981IM5X-4.7LP2981IM5-4.7LP2981AIM5X-5.0LP2981AIM5-5.0LP2981IM5X-5.0LP2981IM5-5.0LP2981AIBP-2.5LP2981AIBPX-2.5LP2981IBP-2.5LP2981IBPX-2.5LP2981AIBP-3.2LP2981AIBPX-3.2LP2981IBP-3.2LP2981IBPX-3.2LP2981AIBP-3.3LP2981AIBPX-3.3LP2981IBP-3.3LP2981IBPX-3.3

3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel3000UnitsonTapeandReel1000UnitsonTapeandReel250UnitsonTapeandReel3000UnitsonTapeandReel250UnitsonTapeandReel3000UnitsonTapeandReel250UnitsonTapeandReel3000UnitsonTapeandReel250UnitsonTapeandReel3000UnitsonTapeandReel250UnitsonTapeandReel3000UnitsonTapeandReel250UnitsonTapeandReel3000UnitsonTapeandReel

microSMD,5BumpPackage(BPA05)

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AbsoluteMaximumRatings(Note1)

IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheNationalSemiconductorSalesOffice/Distributorsforavailabilityandspecifications.StorageTemperatureRangeOperatingJunctionTemperatureRange

LeadTemperature(Soldering,5sec.)ESDRating(Note2)

−65˚Cto+150˚C−40˚Cto+125˚C

260˚C2kV

PowerDissipation(Note3)InputSupplyVoltage(Survival)InputSupplyVoltage(Operating)ShutdownInputVoltage(Survival)OutputVoltage(Survival,(Note4))IOUT(Survival)

Input-OutputVoltage(Survival,(Note5))

InternallyLimited−0.3Vto+16V2.1Vto+16V−0.3Vto+16V−0.3Vto+9V

ShortCircuitProtected

−0.3Vto+16V

ElectricalCharacteristics

LimitsinstandardtypefaceareforTJ=25˚C,andlimitsinboldfacetypeapplyoverthefulloperatingtemperaturerange.Un-lessotherwisespecified:VIN=VO(NOM)+1V,CIN=1µF,IL=1mA,COUT=4.7µF,VON/OFF=2V.Symbol

Parameter

Conditions

Typ

LP2981AI-XX(Note6)Min

∆VOOutputVoltageTolerance

IL=1mA

1mA−0.75−1.0−2.5

Max0.751.02.5

LP2981I-XX(Note6)Min−1.25−2.0−3.5

Max1.252.03.5

%VNOMUnits

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LP2981ElectricalCharacteristics

Note2:TheESDratingofpins3and4is1kV.

(Continued)

Note1:Absolutemaximumratingsindicatelimitsbeyondwhichdamagetothecomponentmayoccur.Electricalspecificationsdonotapplywhenoperatingthede-viceoutsideofitsratedoperatingconditions.

Note3:Themaximumallowablepowerdissipationisafunctionofthemaximumjunctiontemperature,TJ(MAX),thejunction-to-ambientthermalresistance,θJA,andtheambienttemperature,TA.Themaximumallowablepowerdissipationatanyambienttemperatureiscalculatedusing:

ThevalueofθJAfortheSOT-23packageis220˚C/WandthemicroSMDpackageis320˚C/W.Exceedingthemaximumallowablepowerdissipationwillcauseex-cessivedietemperature,andtheregulatorwillgointothermalshutdown.

Note4:Ifusedinadual-supplysystemwheretheregulatorloadisreturnedtoanegativesupply,theLP2981outputmustbediode-clampedtoground.

Note5:TheoutputPNPstructurecontainsadiodebetweentheVINandVOUTterminalsthatisnormallyreverse-biased.ReversingthepolarityfromVINtoVOUTwillturnonthisdiode(seeApplicationHints).

Note6:Limitsare100%productiontestedat25˚C.LimitsovertheoperatingtemperaturerangeareguaranteedthroughcorrelationusingStatisticalQualityControl(SQC)methods.ThelimitsareusedtocalculateNational’sAverageOutgoingQualityLevel(AOQL).

Note7:Dropoutvoltageisdefinedastheinputtooutputdifferentialatwhichtheoutputvoltagedrops100mVbelowthevaluemeasuredwitha1Vdifferential.Note8:TheON/OFFinputsmustbeproperlydriventopreventmisoperation.Fordetails,refertoApplicationHints.Note9:SeeTypicalPerformanceCharacteristicscurves.

BasicApplicationCircuit

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additionalstabilitymargin(seeApplicationHints).***Donotmakeconnectionstothispin.

*ON/OFFinputmustbeactivelyterminated.TietoVINifthisfunctionisnottobeused.

**MinimumOutputCapacitanceisshowntoinsurestabilityoverfullloadcurrentrange.Morecapacitanceprovidessuperiordynamicperformanceand

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LP2981TypicalPerformanceCharacteristics

COUT=4.7µF,CINOutputVoltagevsTemperature

Unlessotherwisespecified:TA=25˚C,VIN=VO(NOM)+1V,

=1µFallvoltageoptions,ON/OFFpintiedtoVIN.

OutputVoltagevsTemperature

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OutputVoltagevsTemperature

DropoutCharacteristics

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DropoutCharacteristicsDropoutCharacteristics

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LP2981TypicalPerformanceCharacteristics

COUT=4.7µF,CINDropoutVoltagevsTemperature

Unlessotherwisespecified:TA=25˚C,VIN=VO(NOM)+1V,

=1µFallvoltageoptions,ON/OFFpintiedtoVIN.(Continued)

DropoutVoltagevsLoadCurrent

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GroundPinCurrentvsTemperatureGroundPinCurrentvsLoadCurrent

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InputCurrentvsVINInputCurrentvsVINDS012506-16

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LP2981TypicalPerformanceCharacteristics

COUT=4.7µF,CINLineTransientResponse

Unlessotherwisespecified:TA=25˚C,VIN=VO(NOM)+1V,

=1µFallvoltageoptions,ON/OFFpintiedtoVIN.(Continued)

LineTransientResponse

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LoadTransientResponseLoadTransientResponse

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LoadTransientResponseLoadTransientResponse

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LP2981TypicalPerformanceCharacteristics

COUT=4.7µF,CINShortCircuitCurrent

Unlessotherwisespecified:TA=25˚C,VIN=VO(NOM)+1V,

=1µFallvoltageoptions,ON/OFFpintiedtoVIN.(Continued)

InstantaneousShortCircuitCurrentvsTemperature

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ShortCircuitCurrent

InstantaneousShortCircuitCurrentvsOutputVoltage

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OutputImpedancevsFrequency

RippleRejection

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DS012506-28

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LP2981TypicalPerformanceCharacteristics

COUT=4.7µF,CINOutputNoiseDensity

Unlessotherwisespecified:TA=25˚C,VIN=VO(NOM)+1V,

=1µFallvoltageoptions,ON/OFFpintiedtoVIN.(Continued)

OutputImpedancevsFrequency

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InputtoOutputLeakagevsTemperature

OutputReverseLeakagevsTemperature

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Turn-OnWaveformTurn-OffWaveform

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LP2981TypicalPerformanceCharacteristics

COUT=4.7µF,CINON/OFFPinCurrentvsVON/OFFUnlessotherwisespecified:TA=25˚C,VIN=VO(NOM)+1V,

=1µFallvoltageoptions,ON/OFFpintiedtoVIN.(Continued)

ON/OFFThresholdvsTemperature

DS012506-36

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ApplicationHints

EXTERNALCAPACITORS

Likeanylow-dropoutregulator,theexternalcapacitorsusedwiththeLP2981mustbecarefullyselectedtoassureregula-torloopstability.

INPUTCAPACITOR:Aninputcapacitorwhosevalueis≥1µFisrequiredwiththeLP2981(amountofcapacitancecanbeincreasedwithoutlimit).

Thiscapacitormustbelocatedadistanceofnotmorethan0.5\"fromtheinputpinoftheLP2981andreturnedtoacleananalogground.Anygoodqualityceramicortantalumcanbeusedforthiscapacitor.

OUTPUTCAPACITOR:TheoutputcapacitormustmeetboththerequirementforminimumamountofcapacitanceandE.S.R.(equivalentseriesresistance)value.CurvesareprovidedwhichshowtheallowableESRrangeasafunctionofloadcurrentforvariousoutputvoltagesandcapacitorval-ues(refertoFigures1,2,3,4).

IMPORTANT:TheoutputcapacitormustmaintainitsESRinthestableregionoverthefulloperatingtemperaturerangetoassurestability.Also,capacitortoleranceandvariationwithtemperaturemustbeconsideredtoassuretheminimumamountofcapacitanceisprovidedatalltimes.

Thiscapacitorshouldbelocatednotmorethan0.5\"fromtheoutputpinoftheLP2981andreturnedtoacleananalogground.

CAPACITORCHARACTERISTICS

TANTALUM:TantalumcapacitorsarethebestchoiceforusewiththeLP2981.MostgoodqualitytantalumscanbeusedwiththeLP2981,butcheckthemanufacturer’sdatasheettobesuretheESRisinrange.

ItisimportanttorememberthatESRincreasesatlowertem-peraturesandacapacitorthatisneartheupperlimitforsta-bilityatroomtemperaturecancauseinstabilitywhenitgetscold.

Inapplicationswhichmustoperateatverylowtemperatures,itmaybenecessarytoparalleltheoutputtantalumcapacitorwithaceramiccapacitortopreventtheESRfromgoinguptoohigh(seenextsectionforimportantinformationonce-ramiccapacitors).

11

CERAMIC:CeramiccapacitorsarenotrecommendedforuseattheoutputoftheLP2981.ThisisbecausetheESRofaceramiccanbelowenoughtogobelowtheminimumstablevaluefortheLP2981.A2.2µFceramicwasmeasuredandfoundtohaveanESRofabout15mΩ,whichislowenoughtocauseoscillations.

Ifaceramiccapacitorisusedontheoutput,a1Ωresistorshouldbeplacedinserieswiththecapacitor.

ALUMINUM:Becauseoflargephysicalsize,aluminumelec-trolyticsarenottypicallyusedwiththeLP2981.TheymustmeetthesameESRrequirementsovertheoperatingtem-peraturerange,moredifficultbecauseoftheirsteepincreaseatcoldtemperature.

AnaluminumelectrolyticcanexhibitanESRincreaseofasmuchas50Xwhengoingfrom20˚Cto−40˚C.Also,somealuminumelectrolyticsarenotoperationalbelow−25˚Cbe-causetheelectrolytecanfreeze.

DS012506-38

FIGURE1.5V/3.3µFESRCurves

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LP2981ApplicationHints

(Continued)

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IftheoutputisforcedabovetheinputbymorethanaVBE,thisdiodewillbecomeforwardbiasedandcurrentwillflowfromtheVOUTterminaltoVIN.

Thiscurrentmustbelimitedto<100mAtopreventdamagetothepart.

Theinternaldiodecanalsobeturnedonbyabruptlystep-pingtheinputvoltagetoavaluebelowtheoutputvoltage.Topreventregulatormis-operation,aSchottkydiodeshouldbeusedinanyapplicationwhereinput/outputvoltagecondi-tionscancausetheinternaldiodetobeturnedon(seebe-low).

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FIGURE2.5V/10µFESRCurves

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Asshown,theSchottkydiodeisconnectedinparallelwiththeinternalparasiticdiodeandpreventsitfrombeingturnedonbylimitingthevoltagedropacrossittoabout0.3V.

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FIGURE3.3V/3.3µFESRCurves

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FIGURE4.3V/10µFESRCurves

REVERSECURRENTPATH

ThepowertransistorusedintheLP2981hasaninherentdi-odeconnectedbetweentheregulatorinputandoutput(seebelow).

ON/OFFINPUTOPERATION

TheLP2981isshutoffbypullingtheON/OFFinputlow,andturnedonbydrivingtheinputhigh.Ifthisfeatureisnottobeused,theON/OFFinputshouldbetiedtoVINtokeeptheregulatoronatalltimes(theON/OFFinputmustnotbeleftfloating).

Toensureproperoperation,thesignalsourceusedtodrivetheON/OFFinputmustbeabletoswingaboveandbelowthespecifiedturn-on/turn-offvoltagethresholdswhichguar-anteeanONorOFFstate(seeElectricalCharacteristics).TheON/OFFsignalmaycomefromeitheratotem-poleout-put,oranopen-collectoroutputwithpull-upresistortotheLP2981inputvoltageoranotherlogicsupply.Thehigh-levelvoltagemayexceedtheLP2981inputvoltage,butmustre-mainwithintheAbsoluteMaximumRatingsfortheON/OFFpin.

Itisalsoimportantthattheturn-on/turn-offvoltagesignalsappliedtotheON/OFFinputhaveaslewratewhichisgreaterthan40mV/µs.

Important:theregulatorshutdownfunctionwilloperateincor-rectlyifaslow-movingsignalisappliedtotheON/OFFinput.MicroSMDMounting

ThemicroSMDpackagerequiresspecificmountingtech-niqueswhicharedetailedinNationalSemiconductorAppli-cationNote#1112.ReferringtothesectionSurfaceMountTechnology(SMT)AssemblyConsiderations,itshouldbenotedthatthepadstylewhichmustbeusedwiththe5-pinpackageistheNSMD(non-soldermaskdefined)type.

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LP2981ApplicationHints

(Continued)

Forbestresultsduringassembly,alignmentordinalsonthePCboardmaybeusedtofacilitateplacementofthemicroSMDdevice.

MicroSMDLightSensitivity

ExposingthemicroSMDdevicetodirectsunlightwillcausemisoperationofthedevice.LightsourcessuchasHalogenlampscanalsoaffectelectricalperformanceifbroughtneartothedevice.

Thewavelenghtswhichhavethemostdetrimentaleffectareredsandinfra-reds,whichmeansthatthefluorescentlight-ingusedinsidemostbuildingshasverylittleeffectonperfor-mance.AmicroSMDtestboardwasbroughttowithin1cmofafluorescentdesklampandtheeffectontheregulatedoutputvoltagewasnegligible,showingadeviationoflessthan0.1%fromnominal.

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LP2981PhysicalDimensions

inches(millimeters)unlessotherwisenoted

5-LeadSmallOutlinePackage(M5)

NSPackageNumberMF05A

ForOrderNumbers,refertoTable1inthe“OrderingInformation”sectionofthisdocument.

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LP2981PhysicalDimensions

inches(millimeters)unlessotherwisenoted(Continued)

NOTES:UNLESSOTHERWISESPECIFIED1.EPOXYCOATING

2.63Sn/37PbEUTECTICBUMP

3.RECOMMENDNON-SOLDERMASKDEFINEDLANDINGPAD.

4.PIN1ISESTABLISHEDBYLOWERLEFTCORNERWITHRESPECTTOTEXTORIENTATION.REMAININGPINSARENUMBEREDCOUNTERCLOCKWISE.

5.XXXINDRAWINGNUMBERREPRESENTSPACKAGESIZEVARIATIONWHEREX1ISPACKAGEWIDTH,X2ISPACK-AGELENGTHANDX3ISPACKAGEHEIGHT.6.NOJEDECREGISTRATIONASOFAUG.1999.

microSMD,5BumpPackage(BPA05)

NSPackageNumberBPA05A

ForOrderNumbers,refertoTable1inthe“OrderInformation”sectionofthisdocument.

ThedimensionsforX1,X2andX3areasgiven:

X1=0.930+/−0.030mmX2=1.107+/−0.030mmX3=0.850+/−0.050mm

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LP2981Micropower100mAUltraLow-DropoutRegulatorNotes

LIFESUPPORTPOLICY

NATIONAL’SPRODUCTSARENOTAUTHORIZEDFORUSEASCRITICALCOMPONENTSINLIFESUPPORTDEVICESORSYSTEMSWITHOUTTHEEXPRESSWRITTENAPPROVALOFTHEPRESIDENTANDGENERALCOUNSELOFNATIONALSEMICONDUCTORCORPORATION.Asusedherein:1.Lifesupportdevicesorsystemsaredevicesorsystemswhich,(a)areintendedforsurgicalimplantintothebody,or(b)supportorsustainlife,andwhosefailuretoperformwhenproperlyusedinaccordancewithinstructionsforuseprovidedinthelabeling,canbereasonablyexpectedtoresultinasignificantinjurytotheuser.

NationalSemiconductorCorporationAmericas

Tel:1-800-272-9959Fax:1-800-737-7018Email:support@nsc.com

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NationalSemiconductorEurope

Fax:+49(0)180-5308586Email:europe.support@nsc.com

DeutschTel:+49(0)6995086208EnglishTel:+44(0)8702402171FrançaisTel:+33(0)141918790

2.Acriticalcomponentisanycomponentofalifesupportdeviceorsystemwhosefailuretoperformcanbereasonablyexpectedtocausethefailureofthelifesupportdeviceorsystem,ortoaffectitssafetyoreffectiveness.

NationalSemiconductorAsiaPacificCustomerResponseGroupTel:65-2544466Fax:65-2504466

Email:ap.support@nsc.com

NationalSemiconductorJapanLtd.

Tel:81-3-5639-7560Fax:81-3-5639-7507

Nationaldoesnotassumeanyresponsibilityforuseofanycircuitrydescribed,nocircuitpatentlicensesareimpliedandNationalreservestherightatanytimewithoutnoticetochangesaidcircuitryandspecifications.