300mA的超低噪聲小封裝超高速CMOS LDO穩(wěn)壓器LP3984

文章來(lái)源：科創(chuàng)達(dá)LP3984文章來(lái)源：科創(chuàng)達(dá)LP3984-02Pageof11300mA,Ultra-lownoise,SmallPackageUltra-FastCMOSLDORegulatorGeneralDescriptionTheLP3984isdesignedforportableRFandwirelessapplicationswithdemandingperformanceandspacerequirements.TheLP3984performanceisoptimizedforbattery-poweredsystemstodeliverultralownoiseandlowquiescentcurrent.Anoisebypasspinisavailableforfurtherreductionofoutputnoise.Regulatorgroundcurrentincreasesonlyslightlyindropout,furtherprolongingthebatterylife.TheLP3984alsoworkswithlow-ESRceramiccapacitors,reducingtheamountofboardspacenecessaryforpowerapplications,criticalinhand-heldwirelessdevices.TheLP3984consumeslessthan0.01pAinshutdownmodeandhasfastturn-ontimelessthan50ps.Theotherfeaturesineludeultralowdropoutvoltage,highoutputaccuracy,currentlimitingprotection,andhighripplerejectionratio.Itisavailableinthe5-leadofSOT23-5packages.OrderingInformationLP3984□□□□□F:Pb-FreePackageTypeB5:SOT23-5OutputVoltageType30:3.0V33:3.3VFeaturesUltra-Low-NoiseforRFApplication2V-6.5VInputVoltageRangeLowDropout:200mV@300mA1.2V,1.3V,1.5V,1.8V,2.5V,2.8V3.0Vand3.3VFixed300mAOutputCurrent,550mAPeakCurrentHighPSSR:-73dBat1KHz<0.01uAStandbyCurrentWhenShutdownAvailableinSOT23-5PackageTTL-Logic-ControlledShutdownInputUltra-FastResponseinLine/LoadtransientCurrentLimitingandThermalShutdownProtectionQuickstart-up(typically50uS)TypicalApplicationCircuit12:1.2V13:1.3V15:1.5V12:1.2V13:1.3V15:1.5V18:1.8V25:2.5V28:2.8V2H:2.85VPortableMediaPlayers/MP3playersCellularandSmartmobilephoneLCDDSCSensorWirelessCardLowPuierKemi微源半導(dǎo)體PinConfigurationsVIN15GND2EN34TopViewVOUTBPSOT23-5MarkingInformationDeviceMarkingPackageShippingLP3984XXXXSOT23-53K/REELLoirDHer^ini微源半導(dǎo)禮ENVREFSHUTDOWN

ENVREFSHUTDOWN

AND

LOGIC

CONTROLVINFunctionalPinDescriptionPinnumberPinNamePinFunction1VINPowerInputVoltage.2GNDGround.3ENChipEnable(ActiveHigh).Notethatthispinishighimpedanee.Thereshouldbeapulllow100kQresistorconnectedtoGNDwhenthecontrolsignalisfloating.4BPRefereneeNoiseBypass.5VOUTOutputVoltage.FunctionBlockDiagramVOUTGNDVOUTGNDMOS

DRIVERERROR

AMPLIFIERCURRENT-LIMIT

ANDTHERMAL

PROTECTION

AbsoluteMaximumRatingsTOC\o"1-5"\h\zSupplyInputVoltage6.5VPowerDissipation,PD@TA=25°CSOT23-5400mWPackageThermalResistanceSOT23-5,9JA-250°C/WLeadTemperature(Soldering,10sec.)260°CStorageTemperatureRange65°Cto150°CESDSusceptibilityHBM(HumanBodyMode)2kVMM(Machine-Mode)200VRecommendedOperatingConditionsSupplyInputVoltage2.5Vto5.5VENInputVoltage0Vto5.5VOperationJunctionTemperatureRange40°Cto125°COperationAmbientTemperatureRange40°Cto85°C?toil'liner^aiiT微源半導(dǎo)體ElectricalCharacteristics(VIN=VOUT+1V,CIN=COUT=1|jF,CBP=22nF,TA=25°C,unlessotherwisespecified)ParameterSymbolTestConditionsMinTyp.MaxUnitsOutputVoltageAccuracy△VOUTIOUT=1mA-2--+2%OutputLoadingCurrentILOADVEN=VIN,VIN>2.5V300mACurrentLimitILIMRLOAD=1Q360400mAQuiescentCurrentIQVEN>1.2V,IOUT=0mA75130pADropoutVoltageVDROPIOUT=200mA,VOUT>2.8V120150mVIOUT=300mA,VOUT>2.8V200260LineRegulation△VLINEVIN=(VOUT+1V)to5.5V,IOUT=1mA0.3%LoadRegulation△LOAD1mA<IOUT<300mA0.6%StandbyCurrentISTBYVEN=GND,Shutdown0.011pAENInputBiasCurrentIIBSDVEN=GNDorVIN0.1100nAENThresholdLogic-LowVoltageVILVIN=3Vto5.5V,Shutdown0.4VLogic-HighVoltageVIHVIN=3Vto5.5V,Start-Up1.4OutputNoiseVoltage10Hzto100kHz,IOUT=200mACOUT=1pF100uVRMSPowerSupplyRejectionRatef=100HzPSRRCOUT=1|jF,IOUT=10mA-76dBf=10kHz-68ThermalShutdownTemperatureTSD165°C?Luul'irtiur^iiiiT微源半傳髏TypicalOperatingCharacteristicsOutputVoltagevs.TemperatureQuiescentCurrentvs.TemperaturenmnnutVoltagevs.LoadCurrentPSRRENPinShoutdownThresholdvs.TemperatureENPinShutdownResponse?LoKroHerSuiiiT微源半導(dǎo)體Lo^dTransientResponseLoadTransientResponse<亙

luaunQ■一Vn=5\''v'clt=2.j1/Cin=Coli=1uFI：3d='nA:q60mA22-20Vin=5V,Vout^2dv-ClN=Ccut=1uFJiLoam=1mAio25(1!!!JnnAri...iiii..1111|111LffMIMM-*111i1111i111111111111U11111111l-400E2000500-50Time(SOClls'Div)Tine(5Q0jis/Div)LineTransientResponseVin=4Vto5V''RT9i^3-"5CB:_Cc_rr=1JF'L...11:II:11??「.….i???■i??：：1■■■■i：??■Ell11I11I11III1111!1111!111七F:JE54100-10Time(WOns/Div)ApplicationsInformationLikeanylow-dropoutregulator,theexternalcapacitorsusedwiththeLP3984mustbecarefullyselectedforregulatorstabilityandperformance.Usingacapacitorwhosevalueis>1pFontheLP3984inputandtheamountofcapacitancecanbeincreasedwithoutlimit.Theinputcapacitormustbelocatedadistanceofnotmorethan0.5inchfromtheinputpinoftheICandreturnedtoacleananalogground.Anygoodqualityceramicortantalumcanbeusedforthiscapacitor.ThecapacitorwithlargervalueandlowerESR(equivalentseriesresistance)providesbetterPSRRandline-transientresponse.TheoutputcapacitormustmeetbothrequirementsforminimumamountofcapacitanceandESRinallLDOsapplication.TheLP3984isdesignedspecificallytoworkwithlowESRceramicoutputcapacitorinspace-savingandperformanceconsideration.Usingaceramiccapacitorwhosevalueisatleast1pFwithESRis>25mQontheLP3984outputensuresstability.TheLP3984stillworkswellwithoutputcapacitorofothertypesduetothewidestableESRrange.Figure1showsthecurvesofallowableESRrangeasafunctionofloadcurrentforvariousoutputcapacitorvalues.Outputcapacitoroflargercapacitancecanreducenoiseandimproveloadtransientresponse,stability,andPSRR.Theoutputcapacitorshouldbelocatednotmorethan0.5inchfromtheVOUTpinoftheLP3984andreturnedtoacleananalogground.Start-upFunctionEnableFunctionTheLP3984featuresanLDOregulatorenable/disablefunction.ToassuretheLDOregulatorwillswitchon,theENturnoncontrollevelmustbegreaterthan1.4volts.TheLDOregulatorwillgointotheshutdownmodewhenthevoltageontheENpinfallsbelow0.4volts.Fortoprotectingthesystem,theLP3984haveaquick-dischargefunction.Iftheenablefunctionisnotneededinaspecificapplication,itmaybetiedtoVINtokeeptheLDOregulatorinacontinuouslyonstate.BypassCapacitorandLowNoiseConnectinga22nFbetweentheBPpinandGNDpinsignificantlyreducesnoiseontheregulatoroutput,itiscriticalthatthecapacitorconnectionbetweentheBPpinandGNDpinbedirectandPCBtracesshouldbeasshortaspossible.ThereisarelationshipbetweenthebypasscapacitorvalueandtheLDOregulatorturnontime.DCleakageonthispincanaffecttheLDOregulatoroutputnoiseandvoltageregulationperformance.ThermalConsiderationsThermalprotectionlimitspowerdissipationinLP3984.Whentheoperationjunctiontemperatureexceeds165°C,theOTPcircuitstartsthethermalshutdownfunctionturnthepasselementoff.Thepasselementturnsonagainafterthejunctiontemperaturecoolsby30°C.Forcontinueoperation,donotexceedabsolutemaximumoperationjunctiontemperature125°C.Thepowerdissipationdefinitionindeviceis:PD=(VIN-VOUT)xIOUT+VINxIQThemaximumpowerdissipationdependsonthethermalresistanceofICpackage,PCBlayout,therateofsurroundingsairflowandtemperaturedifferencebetweenjunctiontoambient.Themaximumpowerdissipationcanbecalculatedbyfollowingformula:PD(MAX)=(TJ(MAX)-TA)/0JAWhereTJ(MAX)isthemaximumoperationjunctiontemperature125°C,TAistheambienttemperatureandthe0JAisthejunct