XL2011规格书(官方版).pdf

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1、5V/2.1A150KHz45VBuckDCtoDCConverterForUSBInterfaceXL2011FeaturesGeneralDescriptionnWide8Vto45Vinputvoltagerange.TheXL2011isa150KHzfixedfrequencynFixed5Voutputvoltage.PWMbuck(step-down)DC/DCconverter,nMaximum2.1Aoutputcurrent.capableofdrivinga2.1AloadwithhighnFixed

2、150KHzswitchingfrequency.efficiency,lowrippleandexcellentlineandnInternaloptimizepowerMOSFET.loadregulation.RequiringaminimumnHighefficiencyupto92%.numberofexternalcomponents,theregulatornBuiltinoutputshortshutdownfunction.issimpletouseandincludeinternalnExcellent

3、lineandloadregulation.frequencycompensationandanBuiltinthermalshutdownfunction.fixed-frequencyoscillator.nBuiltincurrentlimitfunction.nAvailableinSOIC-8package.TheXL2011builtinoutputshortprotectionfunction.Whenshortprotectionfunctionhappens,thechipwillbeshutdown.A

4、ninternalcompensationblockisbuiltintominimizeexternalcomponentcount.ApplicationsnCarCharger.nBatteryCharger.nUSBPowerSupply.Figure1.PackageTypeofXL2011Rev1.015V/2.1A150KHz45VBuckDCtoDCConverterForUSBInterfaceXL2011PinConfigurationsFigure2.PinConfigurationofXL2011(

5、TopView)Table1PinDescriptionPinNumberPinNameDescription1FBFeedbackPin(FB).Thefeedbackthresholdvoltageis5V.2NCNoConnected.InternalVoltageRegulatorBypassCapacity.Intypicalsystem3VCapplication,TheVCpinconnecta1ufcapacitytoVIN.SupplyVoltageInputPin.XL2011operatesfrom8

6、Vto45V4VINDCvoltage.BypassVintoGNDwithasuitablylargecapacitortoeliminatenoiseontheinput.PowerSwitchOutputPin(SW).SWistheswitchnodethat5,6SWsuppliespowertotheoutput.GroundPin.Caremustbetakeninlayout.Thispinshouldbeplacedoutsideoftheschottkydiodetooutputcapacitorgro

7、und7,8GNDpathtopreventswitchingcurrentspikesfrominducingvoltagenoiseintoXL2011.Rev1.025V/2.1A150KHz45VBuckDCtoDCConverterForUSBInterfaceXL2011FunctionBlockFigure3.FunctionBlockDiagramofXL2011TypicalApplicationCircuitFigure4.XL2011TypicalApplicationCircuit(VIN=8V~4

8、5V,VOUT=5V/2.1A)Rev1.035V/2.1A150KHz45VBuckDCtoDCConverterForUSBInterfaceXL2011OrderingInformationPartNumberMarkingIDTemperaturePackingTypePackageLeadFr