SSY1820STR-(1)

SynchronousStepDownRegulatorPB-FREESSY1820Rev_1.1Page1SeniorSemiconductorManufacturingLimitedSSY1820SGENERALDESCRISSIONTheSSY1820Sarehighefficiency600KHzsynchronousstep-downDC-DCconverterscapableofdelivering2.0Aoutputcurrents,respectively.SSY1820Soperateoverawideinputvoltagerangefrom4Vto18VandintegratemainswitchandsynchronousswitchwithverylowRDS(ON)Tominimizetheconductionloss.Lowoutputvoltagerippleandsmallexternalinductorandcapacitorsizesareachievedwith600KHzswitchingfrequency.FeaturesAPPLICATIONSlowRds(on)forinternalswitches(top/bottom)Upto95%Efficiency400KHzFixedSwitchingFrequency4-18VinputvoltagerangeInternalsoftstartlimitstheinrushcurrentSOT23-6Packages2%0.6VreferenceDslModemPortableTV/DVD/DVB/MID/ATSCDPF/MP5HandheldComputersandPDAsAccessPointRouterLVD-TV/LCD-MTYPICALAPPLICATIONSPINASSIGNMENTC1-BypassceramiccapacitorismustputverycloselytotheVinPinPINDESCRISSIONVout=0.6*(1+R1/R2)Cbs=10nFSOTPinNo.PINNAMESDESCRISSION1BSBoot-StrapPin.Supplyhighsidegatedriver.DecouplethispintoLXpinwith0.01uFceramiccap.2GNDGround3FBOutputFeedbackPin.Connectthispintothecenterpointoftheoutputresistordivider(asshowninFigure1)toprogramtheoutputvoltage:Vout=0.6*(1+R1/R2)4ENEnablepin.AhighinputatENenablesthedeviceandalowinputdisablesthedevices.Donotfloat.5INInputpin.6LXInductorpin.ConnectthispintotheswitchingnodeofinductorSynchronousStepDownRegulatorPB-FREESSY1820Rev_1.1Page2SeniorSemiconductorManufacturingLimitedSSY1820SABSOLUTEMAXIMUMRATINGS(Note1)SYMBOLITEMSVALUEUNITVINInputVoltage4～18.0VVSWVoltageatSWPin-0.5～18VVIOAllOtherI/OPinsGND-0.3toVDD+0.3VPDMAXPowerDissipation0.4WSSR1ThermalResistance，SOT-23-6,ΘJA220℃/WTstgStorageTemperature-55to150℃TsolderPackageLeadSolderingTemperature260℃,10sHBMESDSuscessibility(humanbodymode)2kVMMMachineMode200VRECOMMANDEDOPERATINGRANGE(Note1)SYMBOLITEMSVALUEUNITVINVINSupplyVoltage4to16.0VTOSSOperatingTemperature-40to+85℃ELECTRICALCHARACTERISTICS(Note4,5)ThefollowingspecificationsapplyforVIN=VEN=3.6VTA=25oC,unlessspecifiedotherwise.SYMBOLITEMSCONDITIONSMin.Typ.Max.UNITVINInputVoltage416.0VVFBFBPinVoltage588600612mVIqcQuiescentcurrentIout=0Vfb=VREF+5%200µAIoffOperatingCurrent（Shutdown）EN=0V15µAFswSwitchingFrequencyIout-=200mA600KHzDmaxMaximumDutyCycleVFB=0V90%VEN_HENMinimumHighLevel1.5VVEN_LENMaximumLowLevel0.4VVuvloInputUVLOthreshold3.9VRON(1)SWOnResistance(TOPFET)0.11ΩRON(2)SWOnResistance(BottomFET)0.09ΩT-CLTOPFETCurrentLimit2.5ANote1:Typicalparametersaremeasuredat25˚Candrepresenttheparametricnorm.Note2:Datasheetmin/maxspecificationlimitsareguaranteedbydesign,test,orstatisticalanalysis.SynchronousStepDownRegulatorPB-FREESSY1820Rev_1.1Page3SeniorSemiconductorManufacturingLimitedSSY1820SORDERINGINFORMATIONPACKAGETEMPERATURERANGEORDERINGPARTNUMBERTRANSPORTMEDIASSOT23-6-40oCto85oCSSY1820STRTapeandReel3000unitsTYPICALPERFORMANCECHARACTERISTICSSSY1820STREfficiencyVSLoadcurrentSynchronousStepDownRegulatorPB-FREESSY1820Rev_1.1Page4SeniorSemiconductorManufacturingLimitedSSY1820SSSY1820STREfficiencyVSInputVoltageTYPICALAPPLICATIONSSY1820STR,AdjustableOutputVoltageType.Forexample,OutputVoltage=5.0VL:CR75-MC(Sumida,10µH)CIN:22µF,CeramicType,C1=0.1uFCeramicType,COUT:22µF,CeramicType,CBS:0.01µF,CeramicType,CFB:NC,R1:374KΩ(1%)R2:51KΩ(1%)SSY1820STR,AdjustableOutputVoltageType.Forexample,OutputVoltage=3.3VSynchronousStepDownRegulatorPB-FREESSY1820Rev_1.1Page5SeniorSemiconductorManufacturingLimitedSSY1820SL:CR75-MC(Sumida,10µH)CIN:22µF,CeramicType,C1=0.1uFCeramicType,COUT:22µF,CeramicType,CBS:0.01µF,CeramicType,CFB:NC,R1:229.5KΩ(1%)R2:51KΩ(1%)SSY1820STR,AdjustableOutputVoltageType.Forexample,OutputVoltage=1.2VL:CR75-MC(Sumida,2.2H)CIN:22µF,CeramicType,C1=0.1uFCeramicType,COUT:22µF,CeramicType,CBS:0.01µF,CeramicType,CFB:NC,R1:51KΩ(1%)R2:51KΩ(1%)SynchronousStepDownRegulatorPB-FREESSY1820Rev_1.1Page6SeniorSemiconductorManufacturingLimitedSSY1820SPACKAGEINFORMATION