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2A150kHz40VBuckDC/DCConverterWithConstantCurrentLoopXL4001Rev1.21FeaturesnWide4.5Vto40VInputVoltageRangenOutputAdjustablefrom1.235Vto37VnMinimumDropOut1.5VnFixed150kHzSwitchingFrequencyn2AConstantOutputCurrentCapabilitynInternalOptimizePowerTransistornExcellentlineandloadregulationnTTLshutdowncapabilitynON/OFFpinwithhysteresisfunctionnWithoutputconstantcurrentloopnBuiltinthermalshutdownfunctionnBuiltincurrentlimitfunctionnBuiltinoutputovervoltageprotectionnSOP8-EP(ExposedPAD)packageApplicationsnCarChargernBatteryChargernLEDConstantCurrentDriverGeneralDescriptionTheXL4001isa150KHzfixedfrequencyPWMbuck(step-down)DC/DCconverter,capableofdrivinga2Aloadwithhighefficiency,lowrippleandexcellentlineandloadregulation.Requiringaminimumnumberofexternalcomponents,theregulatorissimpletouseandincludeinternalfrequencycompensationandafixed-frequencyoscillator.ThePWMcontrolcircuitisabletoadjustthedutyratiolinearlyfrom0to100%.Anenablefunction,anovercurrentprotectionfunctionisbuiltinside.Aninternalcompensationblockisbuiltintominimizeexternalcomponentcount.Figure1.PackageTypeofXL40012A150kHz40VBuckDC/DCConverterWithConstantCurrentLoopXL4001Rev1.22PinConfigurationsXL400113524CSSWGNDSWFB678ENVINVINFigure2.PinConfigurationofXL4001(TopView)Table1PinDescriptionPinNumberPinNameDescription1,2SWPowerSwitchOutputPin(SW).Outputistheswitchnodethatsuppliespowertotheoutput.3GNDGroundPin.(Note:ConnectedthebackexposedPADtoPin3.)4FBFeedbackPin(FB).Throughanexternalresistordividernetwork,Feedbacksensestheoutputvoltageandregulatesit.Thefeedbackthresholdvoltageis1.235V.5CSOutputCurrentSensePin;(Iload=0.155V/Rcs)6ENEnablePin.DriveENpinlowtoturnonthedevice,driveithightoturnitoff.Floatingisdefaultlow.7,8VINSupplyVoltageInputPin.XL4001operatesfroma4.5Vto40VDCvoltage.BypassVintoGNDwithasuitablylargecapacitortoeliminatenoiseontheinput.2A150kHz40VBuckDC/DCConverterWithConstantCurrentLoopXL4001Rev1.23FunctionBlockFigure3.FunctionBlockDiagramofXL4001TypicalApplicationCircuit(CarCharger)Figure4.XL4001TypicalApplicationCircuit(LiBatteryCharger)2A150kHz40VBuckDC/DCConverterWithConstantCurrentLoopXL4001Rev1.24TypicalApplicationCircuit(BuckLEDConstantCurrentDriver)XL4001CIN100uf/50VC1105COUT100uf/35VD11N5821L33uh+6V~36V7,8351,24GNDVINFBSWCSRcs6ENLED1W~5WR11KR2VOUTFigure5.XL4001TypicalApplicationCircuit(LEDConstantCurrentDriver)OrderingInformationPartNumberMarkingIDLeadFreeLeadFreePackingTypeXL4001E1XL4001E1TubePackageTemperatureRangeXL4001TRE1XL4001E1Tape&ReelXLSEMIPb-freeproducts,asdesignatedwith“E1”suffixintheparnumber,areRoHScompliant.AbsoluteMaximumRatings（Note1）ParameterSymbolValueUnitInputVoltageVin-0.3to45VFBPinVoltageVFB-0.3toVinVENPinVoltageVEN-0.3toVinVSWPinVoltageVSW-0.3toVinVPowerDissipationPDInternallylimitedmWThermalResistance(JunctiontoAmbient,NoHeatsink,FreeAir)RJA60ºC/WOperatingJunctionTemperatureTJ-40to125ºCStorageTemperatureTSTG-65to150ºCLeadTemperature(Soldering,10sec)TLEAD260ºCESD(HBM)2000VNote1:StressesgreaterthanthoselistedunderMaximumRatingsmaycausepermanentdamagetothedevice.Thisisastressratingonlyandfunctionaloperationofthedeviceattheseoranyotherconditionsabovethoseindicatedintheoperationisnotimplied.Exposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffectreliability.2A150kHz40VBuckDC/DCConverterWithConstantCurrentLoopXL4001Rev1.25XL4001ElectricalCharacteristicsTa=25℃;unlessotherwisespecified.SymbolParameterTestConditionMin.Typ.Max.UnitSystemparameterstestcircuitfigure4VFBFeedbackVoltageVin=8Vto32V,Vout=5VIload=0.2Ato2A1.211.2351.26VEfficiencyŋVin=12V,Vout=5VIout=2A-83-%ElectricalCharacteristics(DCParameters)Vin=12V,GND=0V,Vin&GNDparallelconnecta220uf/50Vcapacitor;Iout=500mA,Ta=25℃;theothersfloatingunlessotherwisespecified.ParametersSymbolTestConditionMin.Typ.Max.UnitInputoperationvoltageVin4.540VShutdownSupplyCurrentISTBYVEN=5V80200uAQuiescentSupplyCurrentIqVEN=0V,VFB=Vin25mAOscillatorFrequencyFosc127150172KhzSwitchCurrentLimitILVFB=03AENPinThresholdVENHigh(RegulatorOFF)Low(RegulatorON)1.40.8VOutputSaturationVoltageVCEVFB=0VISW=2A1.11.4VConstantcurrentsenseVoltageVCS0.1400.1550.170VDatasheet2A150kHz40VBuckDC/DCConverterWithConstantCurrentLoopXL4001Rev1.26SchottkyDiodeSelectionTableCurrentSurfaceMountThroughHoleVR(Thesameassystemmaximuminputvoltage)20V30V40V50V60V1A√1N58171N58181N5819√1N58201N58211N5822√MBR320MBR330MBR340MBR350MBR360√SK32SK33SK34SK35SK36√30WQ0330WQ0430WQ05√31DQ0331DQ0431DQ053A√SR302SR303SR304SR305SR3062A150kHz40VBuckDC/DCConverterWithConstantCurrentLoopXL4001Rev1.27PackageInformation(SOP8-EP)2A150kHz40VBuckDC/DCConverterWithConstantCurrentLoopXL4001FeaturesnWide4.5Vto40VInputVoltageRangenOutputAdjustablefrom1.235Vto37VnMinimumDropOut1.5VnFixed150kHzSwitchingFrequencyn2AConstantOutputCurrentCapabilitynInternalOptimizePowerTransistornExcellentlineandloadregulationnTTLshutdowncapabilitynON/OFFpinwithhysteresisfunctionnWithoutputconstantcurrentloopnBuiltinthermalshutdownfunctionnBuiltincurrentlimitfunctionnBuiltinoutputovervoltageprotectionnSOP8-EP(ExposedPAD)packageGeneralDescriptionTheXL4001isa150KHzfixedfre