SY8105ADC规格书-5A-DC-DC

ApplicationsNote:AN_SY8105HighEfficiency,500kHz,5A,18VInputSynchronousStepDownRegulatorAN_SY8105Rev.0.9SilergyCorp.Confidential-PreparedforCustomerUseOnly1GeneralDescriptionTheSY8105isahighefficiency500kHzsynchronousstep-downDC-DCconvertercapableofdelivering5.0Acurrent.TheSY8105operatesoverawideinputvoltagerangefrom4.5Vto18VandintegratesmainswitchandsynchronousswitchwithverylowRDS(ON)tominimizetheconductionloss.Lowoutputvoltagerippleandsmallexternalinductorandcapacitorsizesareachievedwith500kHzswitchingfrequency.ItadoptstheinstantPWMarchitecturetoachievefasttransientresponsesforhighstepdownapplicationsOrderingInformationPackageCodeTemperatureCodeOptionalSpecCode□□□□(□□□□□□□□)□□□□SY8105PackageCodeTemperatureCodeOptionalSpecCode□□□□(□□□□□□□□)□□□□SY8105Features•lowRDS(ON)forinternalswitches(top/bottom):40mΩ/26mΩ•4.5-18Vinputvoltagerange•5.0Aoutputcurrentcapability•500kHzswitchingfrequency•InstantPWMarchitecturetoachievefasttransientresponses.•Internalsoftstartlimitstheinrushcurrent•Cycle-by-cyclepeakcurrentlimitation•1.5%0.6Vreference•TSOT23-6packageApplications•SetTopBox•PortableTV•AccessPointRouter•DSLModem•LCDTVTypicalApplicationsEfficiencyvs.LoadCurrentEfficiency(%)LoadCurrent(A)0.0010.010.11100102030405060708090100VIN=5V,VOUT=3.3VVIN=12V,VOUT=3.3VVIN=16V,VOUT=3.3VFigure1.SchematicDiagramFigure2.SchematicDiagramOrderingNumberPackagetypeNoteSY8105ADCTSOT23-6--AN_SY8105AN_SY8105Rev.0.9SilergyCorp.Confidential-PreparedforCustomerUseOnly2Pinout(topview)FBLXBSENINGNDTSOT23-6(FC)TopMark:NYxyz,(Devicecode:NY,x=yearcode,y=weekcode,z=lotnumbercode)PinNamePinNumberPinDescriptionFB1OutputFeedbackPin.Connectthispintothecenterpointoftheoutputresistordivider(asshowninFigure1)toprogramtheoutputvoltage:Vout=0.6*(1+R1/R2)EN2Enablecontrol.Pullhightoturnon.Donotfloat.GND3GroundpinIN4Inputpin.DecouplethispintoGNDpinwithatleast1uFceramiccapLX5Inductorpin.ConnectthispintotheswitchingnodeofinductorBS6Boot-StrapPin.Supplyhighsidegatedriver.DecouplethispintoLXpinwith0.1uFceramiccap.AbsoluteMaximumRatings(Note1)SupplyInputVoltage------------------------------------------------------------------------------------------------------19VEnableVoltage-----------------------------------------------------------------------------------------------------VIN+0.3VFBVoltage-------------------------------------------------------------------------------------------------------------------4VPowerDissipation,PD@TA=25°C,TSOT23-6（FC）--------------------------------------------------------1.75WPackageThermalResistance(Note2)θJA--------------------------------------------------------------------------------------------------------------56°C/WθJC--------------------------------------------------------------------------------------------------------------6.3°C/WJunctionTemperatureRange------------------------------------------------------------------------------------------125°CLeadTemperature(Soldering,10sec.)-------------------------------------------------------------------------------260°CStorageTemperatureRange----------------------------------------------------------------------------------65°Cto150°CRecommendedOperatingConditions(Note3)SupplyInputVoltage------------------------------------------------------------------------------------------------4.5Vto18VJunctionTemperatureRange------------------------------------------------------------------------------------40°Cto125°CAmbientTemperatureRange------------------------------------------------------------------------------------40°Cto85°CAN_SY8105AN_SY8105Rev.0.9SilergyCorp.Confidential-PreparedforCustomerUseOnly3BlockDiagramAN_SY8105AN_SY8105Rev.0.9SilergyCorp.Confidential-PreparedforCustomerUseOnly4ElectricalCharacteristics(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)140mΩBottomFETRONRDS(ON)220mΩTOPFETPeakCurrentLimitILIM,TOP10ABottomFETValleyCurrentLimitILIM,BOTTOM5.0AENRisingThresholdVENH1.5VENFallingThresholdVENL0.4VInputUVLOThresholdVUVLO4.5VUVLOHysteresisVHYS0.3VMinONTime80nsMinOFFTime160nsSwitchingFrequency500kHzThermalShutdownTemperatureTSD150°CThermalShutdownHysteresisTHYS15°CNote1:Stressesbeyondthe“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Thesearestressratingsonly.Functionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedintheoperationalsectionsofthespecificationisnotimplied.Exposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffectdevicereliability.Note2:θJAismeasuredinthenaturalconvectionatTA=25°Conatwo-layerSilergyEvaluationBoard..Note3:ThedeviceisnotguaranteedtofunctionoutsideitsoperatingconditionsAN_SY8105AN_SY8105Rev.0.9SilergyCorp.Confidential-PreparedforCustomerUseOnly5TypicalPerformanceCharacteristicsEfficiency(%)Efficiency(%)Efficiency(%)AN_SY8105AN_SY8105Rev.0.9SilergyCorp.