AN_SY7080_CVT_Kevin

AN_SY70800.9VMinimumInputand4VMaximumOutput1.8APeakCurrentSynchronousBoostwithOutputDisconnectPreliminarySpecificationSY7080Rev.0.3SilergyCorp.Confidential-PreparedforCustomeruseOnly1GeneralDescriptionSY7080isa1.2MHzfixedfrequency,Currentmode,highefficiencysynchronousboostregulatorthatconvertsdownto0.9Vinputintoupto4Voutputvoltage.ItadoptsverylowRdsonN-MOSforthemainswitchandP-MOSforthesynchronousswitch,sonoexternalSchottkydidodeisrequired,andthesystemefficiencyisimproved.Itcandisconnecttheoutputduringtheshutdownoperation.TheSY7080intendedforsystemsthataretypicallyoperatedfromasingleordual-cellnickel-cadmium(NICd),mickel-metalhydride(NiMH),oralkalinebattery.OrderingInformationTemperatureCodeOptionalSpecCodeSY7080□□□□(□□□□□□□□)□□□□PackageCodeTemperatureCodeOptionalSpecCodeSY7080□□□□(□□□□□□□□)□□□□PackageCodeTemperatureRange:-40°Cto85°COrderingNumberPackagetypeNoteSY7080ABCSOT23-6----Features•0.9Vto4Vwideinputrange•4Vmaxoutputvoltage•1.8Ainternalswitch•Upto95%efficiency•1uAshutdowncurrent•1.2MHzswitchingfrequency•Minimumontime:80nstypical•Minimumofftime:60nstypical•Outputdisconnectatshutdown•LowRDS(ON)(mainswitch/synchronousswitch)at3.3Voutput:90/200mΩ•CompactSOT23-6Applications•LiIonorLiPolymerpoweredCellPhones,DSCs,PMP,GPS.•Alkalinebatterypoweredelectronicequipment.•wirelessmouse.TypicalApplications12Figure1.SchematicDiagramFigure2.EfficiencyvsLoadCurrentAN_SY7080SY7080Rev.0.3SilergyCorp.Confidential-PreparedforCustomeruseOnly2Pinout(topview)(SOT23-6)Topmark:EExyz(Devicecode:EE.,x=yearcode,y=weekcode,z=lotnumbercode)PinNamePinNumberPinDescriptionIN6Powerinputpin.GND2GroundpinEN4Enablepin.Donotfloatthispin.OUT5Voltageoutputpin.LX1Inductornode.ConnectaninductorbetweenINpinandLXpinFB3Feedbackpin.ConnectaresistorR1betweenOUTandFB,andaresistorR2betweenFBandGNDtoprogramtheoutputvoltage.VOUT=1.2V*(R1/R2+1)AbsoluteMaximumRatings(Note1)AllPinstoGND--------------------------------------------------------------------------------------------------4.5VPowerDissipation,PD@TA=25°CSOT23-6--------------------------------------------------------------0.6WPackageThermalResistance(Note2)θJA-----------------------------------------------------------------------------------------------------170°C/WθJC-----------------------------------------------------------------------------------------------------130°C/WJunctionTemperatureRange----------------------------------------------------------------------------------125°CLeadTemperature(Soldering,10sec.)----------------------------------------------------------------------260°CStorageTemperatureRange------------------------------------------------------------------------------------65°Cto150°CRecommendedOperatingConditions(Note3)IN-----------------------------------------------------------------------------------------------------------------0.9Vto4VEN----------------------------------------------------------------------------------------------------------------0VtoVOUT+0.3VAllotherpins----------------------------------------------------------------------------------------------------0-4VJunctionTemperatureRange----------------------------------------------------------------------------------40°Cto125°CAmbientTemperatureRange---------------------------------------------------------------------------------40°Cto85°CAN_SY7080SY7080Rev.0.2ASilergyCorp.Confidential-PreparedforCustomerUseOnly3ElectricalCharacteristics(VIN=2.5V,VOUT=3.3V,IOUT=100mA,TA=25°Cunlessotherwisespecified)ParameterSymbolTestConditionsMinTypMaxUnitMinimumInputVoltageVINRLOAD=2kΩ0.9VOutputVoltageRangeVOUT2.54VQuiescentCurrentIQEN=high,VFB=1.32V65µAShutdownCurrentISHDNEN=0V1µAENRisingThresholdVENH0.9VENFallingThresholdVENL0.4VLowSideMainFETRONRDS(ON)190mΩSynchronousFETRONRDS(ON)2200mΩMainFETCurrentLimitILIM11.8ASwitchingFrequencyFsw1.01.21.4MHzMinOnTime80nSMaxDutyCycle90%FeedbackReferenceVoltageVREF1.1641.21.236VFBInputCurrentIFB-5050nAThermalShutdownTemperatureTSD150℃Note1:Stressesbeyondthe“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Thesearestressratingsonly.Functionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedintheoperationalsectionsofthespecificationisnotimplied.Exposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffectdevicereliability.Note2:θJAismeasuredinthenaturalconvectionatTA=25°ConaloweffectivesinglelayerthermalconductivitytestboardofJEDEC51-3thermalmeasurementstandard.Testcondition:Devicemountedon2”x2”FR-4substratePCB,2ozcopper,withminimumrecommendedpadontoplayerandthermalviastobottomlayergroundplane.Note3:Thedeviceisnotguaranteedtofunctionoutsideitsoperatingconditions.AN_SY7080SY7080Rev.0.2ASilergyCorp.Confidential-PreparedforCustomerUseOnly4FunctionBlockAN_SY7080AN_SY7080Rev.0.3SilergyCorp.Confidential-PreparedforCustomerUseOnly5TypicalPerformanceCharacteristicsEfficiency(%)LoadTransientTime(40us/div)VOUT0.1V/divIOUT0.1A/div(VIN=1.5V,VOUT=3.3V,Iload=0.06-0.2A)StartupfromEnableTime(1ms/div)IOUT0.05A/div(VIN=0.9V,VOUT=3.3V,Rload=100Ω)VOUT2V/divEN2V/divLX2V/divA