aw3640dnr200ma一线电流可调超小封装前置闪光灯驱动器

(效率：94%(VIN=3.6VLEDTorch

AW3640是一款低压降恒流沉（sink）LED驱LED电流在输入电压、LEDVF电压、脚可进行一线调整，共16级档位可选，每档AW3640采用超小的1.5mm×1.0mm×0.55mmShutDown模式下，AW3640电路全部关闭，功耗小于0.1μA。工作电源范围为2.8~5.5V，温度范围 200mA1-WireConfigurableFrontFlashLEDDriverwithUltraSmallPackageFrontFlashLED umFlash16StepsCurrent1-wirePulseConfigurable,LEDCurrentAccuracy:LowDropoutVoltage:65mV@200mAEfficiency:94%(VIN=3.6V,ShutdownCurrent:UltraSmall1.5×1.0×0.55mm3DFN-6LFrontCameraLEDTor

AW3640isalowvoltage-dropcurrentsinkLEDdriver,whichsupportsbothTorchandFlashmodes.Thecurrent-regulationsinkintegratedinthechipmaketheLEDcurrentcapableofkeeconstantwheninputvoltage,LEDforwardvoltageortemperaturechanging.TheLEDcurrentcanbeadjustedamong16stepsbysending1-wirepulseintotheENpin,andthe umvalueis200mA.AW3640isavailableinanultrasmall1.5mm×1.0mm×0.55mmDFN-6Lpackage.Andonlyonemulti-layerceramiccapacitorisneededfortheperipheralofthesolution.Inshutdownmode,AW3640turnsoffallinternalcircuitandtheconsumptionislessthan0.1μA.Thedevicerequires2.8V~5.5Vinputvoltagerangeandanoperatingtemperaturerangeof-40~85℃.+_+_462 Figure1AW3640ApplicationCircuitforSingleAllthesmentionedin arethepropertyoftheirPONFIGURATIONANDTOPAW3640TOP AW3640PIN

D-----12Opendraurrentsinkpin,connectedtoLED345Not6Enablepin.LEDcurrentcanbeadjustedbysending1-wirepulseintothispin.PartDelivery-R:Tape&PackageTypeDN:DFN Figure2AW3640ApplicationCircuitforSingleFigure3AW3640ApplicationCircuitforDualABSOLUTEUMVIN,-0.3toV−0.3toVMaxJunctionTemperature℃StorageTemperature-65to℃umleadtemperature℃JunctiontoAmbient ESD,AllVVVJEDECSTANDARDNO.78BDECEMBER2.8toV-40to℃Ambienttemperature-40to℃NOTE1:Conditionsoutofthoserangeslistedin"absolute umratings"maycausepermanentdamagestothedevice.Inspiteofthelimitsabove,functionaloperationconditionsofthedeviceshouldwithintherangeslistedin"recommendedoperatingconditions".Exposuretoabsolute- um-ratedconditionsforprolongedperiodsmayaffectdevicereliability.NOTE2:Thehumanbodymodelisa100pFcapacitordischargedthrougha1.5kΩresistorintoeachpin.Testmethod:MIL-STD-883GMethod3015.7VBAT=3.8V,TA=25℃fortypicalvalues(unlessotherwiseTestPowerInputoperationVCurrentinShutdown1QuiescentCurrentinActiveEN=1,ILEDDigitalLogicalLogicinputlowVLogicinputhighVPulldownresistor1-WireDimmingPulseENpulselowENpulsehighChipshutdownMeasurefromENfallingedgetothechipenteringshutdownLEDCurrentDropout42564256Figure4AW3640FunctionalFigure5QuiescentCurrentvs.Input Figure LEDCurrentvs.ILEDpinFigure7LEDCurrentvs. Figure8LEDCurrentvs.1-WireDimmingAW3640isalowvoltage-dropcurrentsinkLEDdriver,whichsupportsbothTorchandFlashmodes.Thecurrent-regulationsinkintegratedinthechipmaketheLEDcurrentcapableofkeeconstantwheninputvoltage,LEDforwardvoltageortemperaturechanging.TheLEDcurrentcanbeadjustedamong16stepsbysending1-wirepulseintotheENpin,andthe umvalueis200mA.ENABLEThevoltagelevelatENpindeterminestheoperationstateofthechip.WhentheENpinissettohigh,AW3640operatesinnormalstate.AndthechipwouldentershutdownmodeiftheENpinissettolowforover2.5ms,asabuilt-inshutdowndelaycircuitinAW3640.TheshutdowncurrentdissipatedbyAW3640islessthan0.1μA.GLITCHAW3640builtindeglitchcircuit.Theinterferencweensignalsinsidetheportabledeviceisunavoidable,thusdeglitchcircuitisnecessaryattheENpin.ThedeglitchcircuitinsideAW3640iscapableofeliminatingtheglitchwhichisnarrowerthan80ns,preventingtheorrecttriggerattheENpineffectively.1-WIREPULSEAW3640adoptsthe1-wirepulsedimmingtoavoidtheswitchnoise.A4-bitDACinsideAW3640allowscountingtherisingedgeattheENpintosettheLEDcurrent(refertoFigure5andTable1).Figure5showsthatthefirsthighlevelholdtimeTONshouldbeover20μstomakesurethechipstartupregularly,andmesettingtheLEDcurrenttothe umvalue.OtherENpulsetimingrequirements ludenormalhighleveltimeTHIshouldlongerthan0.5μs,andlowleveltimeTLOshouldbetween0.5μsand500μs.123456 0.5us<THI0.5us<TLO123456Figure9AW36401-wiredimmingtimingTheLEDcurrentstepsdownalongwiththereasingENpulserisingedgenumberasshownintable1.Afterthecurrentsetprocess,theENpinshouldsettohighlevel.ENRisingEdgeLEDCurrentENRisingEdgeENRisingEdgeLEDCurrentENRisingEdgeLEDCurrent19278AW3640isalowvoltage-dropcurrentsinkLEDdriver,itsoperationefficiencycanbeapproxima ycalculatedasbelow.

VFIOUTVINI

≈VFIOUTVIN

VFintheformularepresentstheforwardvoltageofLED.IfVINis3.6V,VFis3.4V,thechipefficiencyisaboutPCBLAYOUTTomakefullyuseoftheperformanceofAW3640,theguidelinesbelowshouldbe1、Alltheperipheralsshouldbecedasclosetothedeviceaspossible. cetheinputcapacitorCINonthetoyer(samelayerastheAW3640)andclosetoVIN(pin4).2Routethepowerline(showninFigure2)aswidelyandshortlyaspossibletoreduceparasiticimpedance.3Tooptimizetheheatdissipationperformance,theGNDpins(pin1&3)shouldbeconnectedtothePCBgroundneusingasmanyviasasAbDEekLFigure10PackageReflowOvenThermalReflowAverageramp-uprate(217℃ctoMax.TimeofPreheattemp.(from150℃to60-Timetobemaintainedabove60-PeakTimewithin5℃ofactualpeak20-Max.Timefrom25℃topeakMax.ChangeJulyDatasheetV0.9OctoberDatasheetV1.0DIInformationinthis isbelievedtobeaccurateandreliable.However,ShanghaiAWINICTechnology (AWINICTechnology)doesnotgiveanyrepresentationsorwarranties,expressedorimplied,astotheaccuracyorcompletenessofsuchinformationandshallhavenoliabilityfortheconsequencesofuseofsuchAWINICTechnologyreservestherighttomakechangestoinformationpublishedinthis,ludingwithoutlimitationspecificationsandproductdescriptions,atanytimeandwithoutnotice.Customersshallobtainthelatestrelev formationbeforecingordersandshallverifythatsuchinformationiscurrentandcomplete.This supersedesandrecesallinformationdpriortothepublicationhereof.AWINICTechnologyproductsarenotdesigned,authorizedorwarrantedtobesuitableforuseinmedical,military,aircraft,spaceorlifesupportequipment,norinapplicationswherefailureormalfunctionofanAWINICTechnologyproductcanreasonablybeexpectedtoresultinalinjury,deathorseverepropertyorenvironmentaldamage.AWINICTechnologyacceptsnoliabilityfor lusionand/oruseofAWINICTechnologyproductsinsuchequipmentorapplicationsandthereforesuch lusionand/oruseisatthecustomer’sownApplicationsthataredescribedhereinforanyoftheseproductsareforillustrativepurposesonly.AWINICTechnologymakesnorepresentationorwarrantythatsuchapplicationswillbesuitableforthespecifiedusewithoutfurthertestingormodification.AllproductsaresoldsubjecttothegeneraltermsandconditionsofcommercialsaledatthetimeoforderNothinginthis maybeinterpretedorconstruedasanoffertosell