LP3986TL-3030资料

LP3986PackageMay2003

LP3986

DualMicropower150mAUltraLow-DropoutCMOSVoltageRegulatorsinmicroSMDPackage

GeneralDescription

Features

TheLP3986isa150mAduallowdropoutregulatorde-nMiniature8-I/OmicroSMDpackage

signedforportableandwirelessapplicationswithdemand-nStablewith1µFceramicandhighqualitytantalumingperformanceandboardspacerequirements.

outputcapacitorsTheLP3986isstablewithasmall1µF±30%ceramicoutputnFastturn-on

capacitorrequiringsmallestpossibleboardspace.

nTwoindependentregulatorsTheLP3986’sperformanceisoptimizedforbatterypowerednLogiccontrolledenable

systemstodeliverultralownoise,extremelylowdropoutnOvercurrentandthermalprotection

voltageandlowquiescentcurrentindependentofloadcur-rent.Regulatorgroundcurrentincreasesveryslightlyindropout,furtherprolongingthebatterylife.OptionalexternalKeySpecifications

bypasscapacitorreducestheoutputnoisefurtherwithoutnGuaranteed150mAoutputcurrentperregulator

slowingdowntheloadtransientresponse.Faststart-uptimen1nAtypicalquiescentcurrentwhenbothregulatorsinisachievedbyutilizingaspeed-upcircuitthatactivelypre-shutdownmode

chargesthebypasscapacitor.Powersupplyrejectionisn60mVtypicaldropoutvoltageat150mAoutputcurrentbetterthan60dBatlowfrequenciesand55dBat10kHz.n115µAtypicalgroundcurrentHighpowersupplyrejectionismaintainedatlowinputvolt-n40µVtypicaloutputnoiseagelevelscommontobatteryoperatedcircuits.

n200µsfastturn-oncircuit

TheLP3986isavailableinamicroSMDpackage.Perfor-n−40˚Cto+125˚Cjunctiontemperature

manceisspecifiedfora−40˚Cto+125˚Ctemperaturerange.ForsingleLDOapplications,pleaserefertotheLP3985datasheet.

Applications

nCDMAcellularhandsetsnGSMcellularhandsets

nPortableinformationappliancesn

Portablebatteryapplications

TypicalApplicationCircuit

20003401

©2003NationalSemiconductorCorporationDS200034www.national.com

DualMicropower150mAUltraLow-DropoutCMOSVoltageRegulatorsinmicroSMD元器件交易网www.cecb2b.com

LP3986BlockDiagram

LP3986

20003402

PinDescription

NameVOUT2EN2BYPASSGNDGNDEN1VOUT1VIN*microSMD

A1B1C1C2C3B3A3A2

Function

OutputVoltageofthesecondLDOEnableinputforthesecondLDOBypasscapacitorforthebandgapCommongroundCommonground

EnableinputforthefirstLDOOutputVoltageofthefirstLDOCommoninputforbothLDOs

*Note:ThepinnumberingschemeforthemicroSMDpackagewasrevisedinApril2002toconformtoJEDECstandard.Onlythepinnumberswererevised.Nochangestothephysicallocationoftheinputs/outputsweremade.Forreferencepurposes,theobsoletenumberingschemehadVOUT2aspin1,EN2aspin2,BYPASSaspin3,GNDaspins4and5,EN1aspin6,VOUT1aspin7,andVINaspin8.

ConnectionDiagram

20003404

TopView

8BumpmicroSMDPackageSeeNSPackageNumberBLA08

www.national.com2

元器件交易网www.cecb2b.com

LP3986OrderingInformation

FormicroSMDPackage(BLhasthicknessof0.995mm)

OutputVoltage(V)2.52.82.82.82.852.852.92.93.03.03.13.13.13.33.33.3

GradeSTDSTDSTDSTDSTDSTDSTDSTD

PackageMarking1410111512131617

LP3986Suppliedas250Units,

TapeandReelLP3986BL-2528LP3986BL-2828LP3986BL-285285LP3986BL-2929LP3986BL-3030LP3986BL-3131LP3986BL-3133LP3986BL-3333

LP3986Suppliedas3000Units,TapeandReelLP3986BLX-2528LP3986BLX-2828LP3986BLX285285LP3986BLX-2929LP3986BLX-3030LP3986BLX-3131LP3986BLX-3133LP3986BLX-3333

FormicroSMDPackage(TLhasthicknessof0.600mm)

OutputVoltage(V)2.52.82.82.82.852.852.92.93.03.03.13.13.13.33.33.3

GradeSTDSTDSTDSTDSTDSTDSTDSTD

PackageMarking1410111512131617

LP3986Suppliedas250Units,

TapeandReelLP3986TL-2528LP3986TL-2828LP3986TL-285285LP3986TL-2929LP3986TL-3030LP3986TL-3131LP3986TL-3133LP3986TL-3333

LP3986Suppliedas3000Units,TapeandReelLP3986TLX-2528LP3986TLX-2828LP3986TLX285285LP3986TLX-2929LP3986TLX-3030LP3986TLX-3131LP3986TLX-3133LP3986TLX-3333

20003403

3www.national.com

元器件交易网www.cecb2b.com

LP3986AbsoluteMaximumRatings

2)

(Notes1,

IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheNationalSemiconductorSalesOffice/Distributorsforavailabilityandspecifications.VIN,VENVOUTJunctionTemperatureStorageTemperaturePadTemp.(Note3)MaximumPowerDissipation(Note4)

−0.3to6.5V

−0.3to(VIN+0.3V)≤6.5V

150˚C

−65˚Cto+150˚C

235˚C3mW

ESDRating(Note5)HumanBodyModelMachineModel

2kV200V

OperatingRatings(Notes1,2)

VINVENJunctionTemperatureThermalResistanceθJAMaximumPowerDissipation(Note6)

220˚C/W250mW2.5to6V

0to(VIN+0.3V)≤6V

−40˚Cto+125˚C

ElectricalCharacteristics

Unlessotherwisespecified:VIN=VOUT(nom)+0.5V,CIN=1µF,IOUT=1mA,COUT=1µF,CBYPASS=0.01µF.TypicalvaluesandlimitsappearinginstandardtypefaceareforTJ=25˚C.Limitsappearinginboldfacetypeapplyovertheentirejunctiontemperaturerangeforoperation,−40˚Cto+125˚C.(Note7)(Note8)Symbol

Parameter

OutputVoltageTolerance

∆VOUTLineRegulationError(Note9)

LoadRegulationError(Note10)OutputACLineRegulation

Conditions

IOUT=1mA

VIN=(VOUT(nom)+0.5V)to6.0V,

IOUT=1mA

IOUT=1mAto150mAVIN=VOUT(nom)+1V,IOUT=150mA(Figure1)VIN=3.1V,f=1kHz,

IOUT=50mA(Figure2)VIN=3.1V,f=10kHz,

IOUT=50mA(Figure2)BothRegulatorsON

VEN=1.4V,IOUT=0mABothRegulatorsON

VEN=1.4V,IOUT=0to150mA

OneRegulatorON

VEN=1.4VIOUT=0mAOneRegulatorON

VEN=1.4VIOUT=0to150mA

VEN=0.4V,BothRegulatorsOFF(shutdown)

DropoutVoltage(Note11)

ISCIOUT(PK)TONShortCircuitCurrentLimit

PeakOutputCurrentTurn-OnTime(Note12)

IOUT=1mAIOUT=150mAOutputGroundedVOUT≥VOUT(nom)-5%CBYPASS=0.01µF

0.006Typ

LimitMin−2.5−3.0

Max2.53.00.0920.1280.0060.01

Units%ofVOUT(nom)%/V

0.0031.560

%/mAmVP-PPSRR

PowerSupplyRejectionRatio

50

dB

IQQuiescentCurrent115220

200320

75130

130200

µA

0.0010.460600500200

300

242100

mVmAmAµs

www.national.com4

元器件交易网www.cecb2b.com

LP3986ElectricalCharacteristics

(Continued)

Unlessotherwisespecified:VIN=VOUT(nom)+0.5V,CIN=1µF,IOUT=1mA,COUT=1µF,CBYPASS=0.01µF.TypicalvaluesandlimitsappearinginstandardtypefaceareforTJ=25˚C.Limitsappearinginboldfacetypeapplyovertheentirejunctiontemperaturerangeforoperation,−40˚Cto+125˚C.(Note7)(Note8)Symbolenρn(1/f)IENVILVIHParameter

OutputNoiseVoltageOutputNoiseDensityMaximumInputCurrentatEN

MaximumLowLevelInputVoltageatENMinimumHighLevelInputVoltageatEN

Conditions

BW=10Hzto100kHz,COUT=1µFf=120Hz,COUT=1µF

VEN=0.4andVIN=6VVIN=2.5to6VVIN=2.5to6V

∆ILoad1=150mAat1KHzrate∆ILoad2=1mA∆VOUT2/∆VOUT1∆ILoad2=150mAat1KHzrate∆ILoad1=1mA∆VOUT2/∆VOUT1(Note13)(Note14)

1.4

Typ401

LimitMin

Max

UnitsµVrmsµV/nA

0.4

VV

±10

XtalkCrosstalkRejection

−60

dB

−60

15

22500

µFmΩ

COUTCapacitanceESR

Note1:AbsoluteMaximumRatingsarelimitsbeyondwhichdamagetothedevicemayoccur.OperatingRatingsareconditionsunderwhichoperationofthedeviceisguaranteed.OperatingRatingsdonotimplyguaranteedperformancelimits.Forguaranteedperformancelimitsandassociatedtestconditions,seetheElectricalCharacteristicstables.

Note2:AllvoltagesarewithrespecttothepotentialattheGNDpin.

Note3:AdditionalinformationonpadtemperaturecanbefoundinNationalSemiconductorApplicationNote(AN-1112).

Note4:TheAbsoluteMaximumpowerdissipationdependsontheambienttemperatureandcanbecalculatedusingtheformula:

PD=(TJ-TA)/θJA,

WhereTJisthejunctiontemperature,TAistheambienttemperature,andθJAisthejunction-to-ambientthermalresistance.The3mWratingappearingunderAbsoluteMaximumRatingsresultsfromsubstitutingtheAbsoluteMaximumjunctiontemperature,150˚C,forTJ,70˚CforTA,and220˚C/WforθJA.Morepowercanbedissipatedsafelyatambienttemperaturesbelow70˚C.Lesspowercanbedissipatedsafelyatambienttemperaturesabove70˚C.TheAbsoluteMaximumpowerdissipationcanbeincreasedby4.5mWforeachdegreebelow70˚C,anditmustbederatedby4.5mWforeachdegreeabove70˚C.

Note5:Thehumanbodymodelis100pFdischargedthrougha1.5kΩresistorintoeachpin.Themachinemodelisa200pFcapacitordischargeddirectlyintoeachpin.

Note6:LiketheAbsoluteMaximumpowerdissipation,themaximumpowerdissipationforoperationdependsontheambienttemperature.The250mWratingappearingunderOperatingRatingsresultsfromsubstitutingthemaximumjunctiontemperatureforoperation,125˚C,forTJ,70˚CforTA,and220˚C/WforθJAinto(1)above.Morepowercanbedissipatedatambienttemperaturesbelow70˚C.Lesspowercanbedissipatedatambienttemperaturesabove70˚C.Themaximumpowerdissipationforoperationcanbeincreasedby4.5mWforeachdegreebelow70˚C,anditmustbederatedby4.5mWforeachdegreeabove70˚C.Note7:Alllimitsareguaranteed.AllelectricalcharacteristicshavingroomtemperaturelimitsaretestedduringproductionwithTJ=25˚CorcorrelatedusingStatisticalQualityControl(SQC)methods.Allhotandcoldlimitsareguaranteedbycorrelatingtheelectricalcharacteristicstoprocessandtemperaturevariationsandapplyingstatisticalprocesscontrol.

Note8:Thetargetoutputvoltage,whichislabeledVOUT(nom),isthedesiredvoltageoption.

Note9:Theoutputvoltagechangesslightlywithlinevoltage.Anincreaseinthelinevoltageresultsinaslightincreaseintheoutputvoltageandviceversa.Note10:Theoutputvoltagechangesslightlywithloadcurrent.Anincreaseintheloadcurrentresultsinaslightdecreaseintheoutputvoltageandviceversa.Note11:Dropoutvoltageistheinput-to-outputvoltagedifferenceatwhichtheoutputvoltageis100mVbelowitsnominalvalue.

Note12:Turn-ontimeisthatbetweentheenableinputjustexceedingVIHandtheoutputvoltagejustreaching95%ofitsnominalvalue.Note13:Rangeofcapacitorvaluesforwhichthedevicewillremainstable.Thiselectricalspecificationisguaranteedbydesign.Note14:RangeofcapacitorESRvaluesforwhichthedevicewillremainstable.Thiselectricalspecificationisguaranteedbydesign.

5www.national.com

元器件交易网www.cecb2b.com

LP398620003408

FIGURE1.LineRegulationInputTestSignal

20003409

FIGURE2.PSRRInputTestSignal

www.national.com6

元器件交易网www.cecb2b.com

LP3986TypicalPerformanceCharacteristics

0.01µF,VIN=VOUTPowerSupplyRejectionRatio(CBP=0.001µF)

Unlessotherwisespecified,CIN=COUT1µFCeramic,C

+0.5,TA=25˚C,bothenablepinsaretiedtoVINBP=

PowerSupplyRejectionRatio(CBP=0.01µF)

2000341020003447

PowerSupplyRejectionRatio(CBP=0.1µF)

OutputNoiseSpectralDensity

2000344820003451

LineTransientResponse(CBP=0.001µF)LineTransientResponse(CBP=0.01µF)

2000341320003449

7www.national.com

元器件交易网www.cecb2b.com

LP3986TypicalPerformanceCharacteristicsUnlessotherwisespecified,CIN=COUT1µFCeramic,CBP=

0.01µF,VIN=VOUT+0.5,TA=25˚C,bothenablepinsaretiedtoVIN(Continued)

LoadTransient&CrossTalk(VIN=VOUT+0.2V)

LoadTransient&CrossTalk(VIN=VOUT+0.2V)

2000341720003416

Start-UpTime(CBP=0.001,0.01,0.1µF)EnableResponse(VIN=4.2V)

20003411

20003414

EnableResponse(VIN=VOUT+0.2V)

EnableResponse

20003415

20003450

www.national.com8

元器件交易网www.cecb2b.com

LP3986TypicalPerformanceCharacteristicsUnlessotherwisespecified,CIN=COUT1µFCeramic,CBP=

0.01µF,VIN=VOUT+0.5,TA=25˚C,bothenablepinsaretiedtoVIN(Continued)

OutputShortCircuitCurrentatVIN=6V

OutputShortCircuitCurrentatVIN=3.3V

2000346520003466

9www.national.com

元器件交易网www.cecb2b.com

LP3986ApplicationHints

EXTERNALCAPACITORS

Likeanylow-dropoutregulator,theLP3986requiresexternalcapacitorsforregulatorstability.TheLP3986isspecificallydesignedforportableapplicationsrequiringminimumboardspaceandsmallestcomponents.Thesecapacitorsmustbecorrectlyselectedforgoodperformance.INPUTCAPACITOR

Aninputcapacitanceof)1µFisrequiredbetweentheLP3986inputpinandground(theamountofthecapacitancemaybeincreasedwithoutlimit).

Thiscapacitormustbelocatedadistanceofnotmorethan1cmfromtheinputpinandreturnedtoacleananalogground.Anygoodqualityceramic,tantalum,orfilmcapacitormaybeusedattheinput.

Important:Tantalumcapacitorscansuffercatastrophicfail-uresduetosurgecurrentwhenconnectedtoalow-impedancesourceofpower(likeabatteryoraverylargecapacitor).Ifatantalumcapacitorisusedattheinput,itmustbeguaranteedbythemanufacturertohaveasurgecurrentratingsufficientfortheapplication.

TherearenorequirementsfortheESRontheinputcapaci-tor,buttoleranceandtemperaturecoefficientmustbecon-sideredwhenselectingthecapacitortoensurethecapaci-tancewillbe)1µFovertheentireoperatingtemperaturerange.

OUTPUTCAPACITOR

TheLP3986isdesignedspecificallytoworkwithverysmallceramicoutputcapacitors,anyceramiccapacitor(tempera-turecharacteristicsX7R,X5R,Z5UorY5V)in1to22µFrangewith5mΩto500mΩESRrangeissuitableintheLP3986applicationcircuit.

Itmayalsobepossibletousetantalumorfilmcapacitorsattheoutput,butthesearenotasattractiveforreasonsofsizeandcost(seenextsectionCapacitorCharacteristics).

Theoutputcapacitormustmeettherequirementformini-mumamountofcapacitanceandalsohaveanESR(Equiva-lentSeriesResistance)valuewhichiswithinastablerange.NO-LOADSTABILITY

TheLP3986willremainstableandinregulationwithno-load(otherthantheinternalvoltagedivider).ThisisspeciallyimportantinCMOSRAMkeep-aliveapplications.

CAPACITORCHARACTERISTICS

TheLP3986isdesignedtoworkwithceramiccapacitorsontheoutputtotakeadvantageofthebenefitstheyoffer:forcapacitancevaluesintherangeof1µFto4.7µFrange,ceramiccapacitorsarethesmallest,leastexpensiveandhavethelowestESRvalues(whichmakesthembestforeliminatinghighfrequencynoise).TheESRofatypical1µFceramiccapacitorisintherangeof20mΩto40mΩ,whicheasilymeetstheESRrequirementforstabilitybytheLP3986.

Theceramiccapacitor’scapacitancecanvarywithtempera-ture.ThecapacitortypeX7R,whichoperatesoveratem-peraturerangeof-55˚Cto+125˚C,willonlyvarythecapaci-tancetowithin±15%.Mostlargevalueceramiccapacitors()2.2µF)aremanufacturedwithZ5UorY5Vtemperaturecharacteristics.Theircapacitancecandropbymorethan50%asthetemperaturegoesfrom25˚Cto85˚C.Therefore,

X7RisrecommendedoverZ5UandY5inapplicationswheretheambienttemperaturewillchangesignificantlyaboveorbelow25˚C.

Tantalumcapacitorsarelessdesirablethanceramicforuseasoutputcapacitorsbecausetheyaremoreexpensivewhencomparingequivalentcapacitanceandvoltageratingsinthe1µFto4.7µFrange.

AnotherimportantconsiderationisthattantalumcapacitorshavehigherESRvaluesthanequivalentsizeceramics.ThismeansthatwhileitmaybepossibletofindatantalumcapacitorwithanESRvaluewithinthestablerange,itwouldhavetobelargerincapacitance(whichmeansbiggerandmorecostly)thanaceramiccapacitorwiththesameESRvalue.ItshouldalsobenotedthattheESRofatypicaltantalumwillincreaseabout2:1asthetemperaturegoesfrom25˚Cdownto−40˚C,sosomeguardbandmustbeallowed.

NOISEBYPASSCAPACITOR

Connectinga0.01µFcapacitorbetweentheCBYPASSpinandgroundsignificantlyreducesnoiseontheregulatorout-put.Thiscapisconnecteddirectlytoahighimpedancenodeinthebandgapreferencecircuit.Anysignificantloadingonthisnodewillcauseachangeontheregulatedoutputvolt-age.Forthisreason,DCleakagecurrentthroughthispinmustbekeptaslowaspossibleforbestoutputvoltageaccuracy.Theuseofthis0.01µFbypasscapacitorisstronglyrecommendedtopreventovershootontheoutputduringstartup.

Thetypesofcapacitorsbestsuitedforthenoisebypasscapacitorareceramicandfilm.High-qualityceramiccapaci-torswitheitherNPOorCOGdielectrictypicallyhaveverylowleakage.Polypropoleneandpolycarbonatefilmcapaci-torsareavailableinsmallsurface-mountpackagesandtypicallyhaveextremelylowleakagecurrent.

UnlikemanyotherLDO’s,additionofanoisereductioncapacitordoesnoteffectthetransientresponseofthede-vice.

ON/OFFINPUTOPERATION

TheLP3986isturnedoffbypullingtheVENpinlow,andturnedonbypullingithigh.Ifthisfeatureisnotused,theVENpinshouldbetiedtoVINtokeeptheregulatoroutputonatalltimes.Toassureproperoperation,thesignalsourceusedtodrivetheVENinputmustbeabletoswingaboveandbelowthespecifiedturn-on/offvoltagethresholdslistedintheElec-tricalCharacteristicssectionunderVILandVIH.

FASTON-TIME

TheLP3986outputsareturnedonafterVrefvoltagereachesitsfinalvalue(1.23Vnominal).Tospeedupthisprocess,thenoisereductioncapacitoratthebypasspinischargedwithaninternal70µAcurrentsource.Thecurrentsourceisturnedoffwhenthebandgapvoltagereachesapproximately95%ofitsfinalvalue.Theturnontimeisdeterminedbythetimeconstantofthebypasscapccitor.Thesmallerthecapacitorvalue,theshortertheturnontime,butlessnoisegetsreduced.Asaresult,turnontimeandnoisereductionneedtobetakenintodesignconsiderationwhenchoosingthevalueofthebypasscapacitor.

www.national.com10

元器件交易网www.cecb2b.com

LP3986ApplicationHints

MICROSMDMOUNTING

(Continued)

ThemicroSMDpackagerequiresspecificmountingtech-niqueswhicharedetailedinNationalSemiconductorAppli-cationNote(AN-1112).ReferringtothesectionSurfaceMountTechnology(SMT)AssemblyConsiderations.Forbestresultsduringassembly,alignmentordinalsonthePCboardmaybeusedtofacilitateplacementofthemicroSMDdevice.

MICROSMDLIGHTSENSITIVITY

ExposingthemicroSMDdevicetodirectsunlightwillcausemisoperationofthedevice.Lightsourcessuchashalogenlampscaneffectelectricalperformanceifbroughtneartothedevice.

Thewavelengthswhichhavemostdetrimentaleffectareredsandinfra-reds,whichmeansthatthefluorescentlight-ingusedinsidemostbuildingshasverylittleeffectonper-formance.AmicroSMDtestboardwasbroughttowithin1cmofafluorescentdesklampandtheeffectontheregu-latedoutputvoltagewasnegligible,showingadeviationoflessthan0.1%fromnominal.

11www.national.com

元器件交易网www.cecb2b.com

LP3986PhysicalDimensions

inches(millimeters)unlessotherwisenoted

microSMD,8Bump

NSPackageNumberBLA08CCC

ThedimensionsforX1,X2andX3areasfollows:

X1=1.55mmX2=1.55mmX3=0.995mm

www.national.com12

元器件交易网www.cecb2b.com

LP3986PackagePhysicalDimensions

inches(millimeters)unlessotherwisenoted(Continued)

microSMD,8Bump

NSPackageNumberATL08CCA

ThedimensionsforX1,X2andX3areasfollows:

X1=1.55mmX2=1.55mmX3=0.600mm

LIFESUPPORTPOLICY

NATIONAL’SPRODUCTSARENOTAUTHORIZEDFORUSEASCRITICALCOMPONENTSINLIFESUPPORTDEVICESORSYSTEMSWITHOUTTHEEXPRESSWRITTENAPPROVALOFTHEPRESIDENTANDGENERALCOUNSELOFNATIONALSEMICONDUCTORCORPORATION.Asusedherein:1.Lifesupportdevicesorsystemsaredevicesor2.Acriticalcomponentisanycomponentofalifesystemswhich,(a)areintendedforsurgicalimplantsupportdeviceorsystemwhosefailuretoperformintothebody,or(b)supportorsustainlife,andcanbereasonablyexpectedtocausethefailureofwhosefailuretoperformwhenproperlyusedinthelifesupportdeviceorsystem,ortoaffectitsaccordancewithinstructionsforuseprovidedinthesafetyoreffectiveness.

labeling,canbereasonablyexpectedtoresultinasignificantinjurytotheuser.

NationalSemiconductorNationalSemiconductor

NationalSemiconductorNationalSemiconductor

AmericasCustomerEuropeCustomerSupportCenter

AsiaPacificCustomerJapanCustomerSupportCenterSupportCenter

Fax:+49(0)180-5308586SupportCenter

Fax:81-3-5639-7507

Email:new.feedback@nsc.comEmail:europe.support@nsc.com

Email:ap.support@nsc.com

Email:jpn.feedback@nsc.comTel:1-800-272-9959

DeutschTel:+49(0)6995086208Tel:81-3-5639-7560

EnglishTel:+44(0)8702402171www.national.com

FrançaisTel:+33(0)141918790

Nationaldoesnotassumeanyresponsibilityforuseofanycircuitrydescribed,nocircuitpatentlicensesareimpliedandNationalreservestherightatanytimewithoutnoticetochangesaidcircuitryandspecifications.DualMicropower150mAUltraLow-DropoutCMOSVoltageRegulatorsinmicroSMD