SY8113B-18V3A同步降压芯片

ApplicationNote:SY8113BHighEfficiency,500kHz,3A,18VInputSynchronousStepDownRegulatorAN_SY8113BRev.0.1SilergyCorp.Confidential-preparedforInternalUseOnly1GeneralDescriptionTheSY8113Bisahighefficiency500kHzsynchronousstep-downDC-DCconvertercapableofdelivering3Acurrent.TheSY8113Boperatesoverawideinputvoltagerangefrom4.5Vto18VandintegratesmainswitchandsynchronousswitchwithverylowRDS(ON)tominimizetheconductionloss.Lowoutputvoltagerippleandsmallexternalinductorandcapacitorsizesareachievedwith500kHzswitchingfrequency.ItadoptstheinstantPWMarchitecturetoachievefasttransientresponsesforhighstepdownapplicationsOrderingInformationPackageCodeTemperatureCodeOptionalSpecCode□□□□(□□□□□□□□)□□□□SY8113TemperatureRange:-40°Cto85°CFeatures•lowRDS(ON)forinternalswitches(top/bottom):80mΩ/40mΩ•4.5-18Vinputvoltagerange•3Aoutputcurrentcapability•500kHzswitchingfrequency•InstantPWMarchitecturetoachievefasttransientresponses.•Cycle-by-cyclepeakcurrentlimitation•Internalsoftstartlimitstheinrushcurrent•±1.5%0.6Vreference•TSOT23-6packageApplications•SetTopBox•PortableTV•AccessPointRouter•DSLModem•LCDTVTypicalApplicationsFigure1.SchematicDiagramFigure2.EfficiencyFigureOrderingNumberPackagetypeNoteSY8113BADCTSOT23-6--AN_SY8113BAN_SY8113BRev.0.1SilergyCorp.Confidential-preparedforInternalUseOnly2Pinout(topview)FBLXBSENINGNDTSOT23-6(FC)TopMark:WCxyz,(Devicecode:WC,x=yearcode,y=weekcode,z=lotnumbercode)PinNamePinNumberPinDescriptionBS1Boot-StrapPin.Supplyhighsidegatedriver.DecouplethispintoLXpinwith0.1uFceramiccap.GND2GroundpinFB3OutputFeedbackPin.Connectthispintothecenterpointoftheoutputresistordivider(asshowninFigure1)toprogramtheoutputvoltage:Vout=0.6*(1+R1/R2)EN4Enablecontrol.Pullhightoturnon.Donotfloat.IN5Inputpin.DecouplethispintoGNDpinwithatleast1uFceramiccapLX6Inductorpin.ConnectthispintotheswitchingnodeofinductorAbsoluteMaximumRatings(Note1)SupplyInputVoltage------------------------------------------------------------------------------------------------19VEnableVoltage----------------------------------------------------------------------------------------------VIN+0.3VFBVoltage-----------------------------------------------------------------------------------------------------------4VPowerDissipation,PD@TA=25°C,TSOT23-6（FC）-----------------------------------------------------1WPackageThermalResistance(Note2)θJA------------------------------------------------------------------------------------------------------100°C/WθJC-----------------------------------------------------------------------------------------------------11.2°C/WJunctionTemperatureRange-----------------------------------------------------------------------------------150°CLeadTemperature(Soldering,10sec.)-----------------------------------------------------------------------260°CStorageTemperatureRange--------------------------------------------------------------------------65°Cto150°CRecommendedOperatingConditions(Note3)SupplyInputVoltage----------------------------------------------------------------------------------------------4.5Vto18VJunctionTemperatureRange------------------------------------------------------------------------------------40°Cto125°CAmbientTemperatureRange------------------------------------------------------------------------------------40°Cto85°CAN_SY8113BAN_SY8113BRev.0.1SilergyCorp.Confidential-preparedforInternalUseOnly3ElectricalCharacteristics(VIN=12V,VOUT=1.2V,L=2.2uH,COUT=47uF,TA=25°C,IOUT=1Aunlessotherwisespecified)ParameterSymbolTestConditionsMinTypMaxUnitInputVoltageRangeVIN4.518VQuiescentCurrentIQIOUT=0,VFB=VREF*105%100μAShutdownCurrentISHDNEN=0510μAFeedbackReferenceVoltageVREF0.5910.60.609VFBInputCurrentIFBVFB=3.3V-5050nATopFETRONRDS(ON)18090mΩBottomFETRONRDS(ON)24050mΩTopFETPeakCurrentLimitILIM,TOP6ABottomFETValleyCurrentLimitILIM34.25AENRisingThresholdVENH1.5VENFallingThresholdVENL0.4VInputUVLOThresholdVUVLO4.5VUVLOHysteresisVHYS0.3VMinONTime5080120nsMinOFFTime140170220nsSwitchingFrequency500kHzSoft-startTimetSS800uSThermalShutdownTemperatureTSD150°CThermalShutdownHysteresisTHYS15°CNote1:Stressesbeyondthe“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Thesearestressratingsonly.Functionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedintheoperationalsectionsofthespecificationisnotimplied.Exposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffectdevicereliability.Note2:θJAismeasuredinthenaturalconvectionatTA=25°Conaloweffective4-layerthermalconductivitytestboardofJEDEC51-3thermalmeasurementstandard.Pin2ofTSOT23-6packagesisthecasepositionforθJCmeasurement.Note3:ThedeviceisnotguaranteedtofunctionoutsideitsoperatingconditionsAN_SY8113BAN_SY8113BRev.0.1SilergyCorp.Confidential-preparedforInternalUseOnly4BlockDiagramAN_SY8113BAN_SY8113BRev.0.1SilergyCorp.Confidential-preparedforInternalUseOnly5TypicalPerformanceCharacteristicsEfficiencyvs.LoadCurrentLoadCurrent(A)0.010.101.0010.00758085909510070VIN=12V,VOUT=5VVIN=16V,VOUT=5VVIN=6V,VOUT=5VEfficiencyvs.LoadCurrentLoadCurrent(A)0.010.101.0010.006065