SX1301--升压方案

HighEfficiencyLowVoltageStep-upDC/DCConverterGENERATIONDESCRIPTIONghefficiency,andlowvoltagestep-upDC/DCconverterwithanAdaptiveCurrentModePWMcontrolloop.Itcomprisesofanerroramplifier,arampgenerator,aPWMcomparator,aswitchpasselementandthedriver.Itprovidesstableandhighefficientoperationoverawiderangeofloadcurrentswithoutexternalcompensation.Thebelow1Vbatterycellapplications.Thebuilt-inpowertransistorisabletoprovideupto300mAoutputcurrentwhileworkingunderLi-BatterySupply.Besides,itprovidesextrapintodriveexternalpowerdevices(NMOSorNPN)incasehigheroutputcurrentisneeded.Theoutputvoltageissetwithtwoexternalresistors.The500KHzhighswitchingratereducesthesizeofexternalcomponents.Besides,the14μAlowquiescentcurrenttogetherwithhighefficiencymaintainslongbatterylifetime.FEATURESzLowQuiescent(Switch-off)SupplyCurrent:14μAzLowStart-upInputVoltage:typical0.8VzHighSupplyCapability:Deliver3.3V100mAwith1AlkalineCell;5V300mAwith1Li-CellzZeroShutdownModeSupplyCurrentzHighefficiency:92%zFixedswitchingfrequency:500KHzzOptionsforinternalorexternalpowerswitcheszPackagetype:SOT-26,SOT-89-5APPLICATIONSzMP3,PDA,ElectroniczDictionary,DSC,LCD,RF-Tag,zPortableDevices,WirelessDevices,etc.OREERINFORMATIONTYPICALAPPLICATIONCIRCUITS(1)TypicalApplication1AlkalineCellto3.3V,100mAOutputCurrent,typicallyforMP3Application.Theisacompact,histart-upinputvoltagemakessuitableforsingleSX1301SX1301PAGE:1SX1301SX1301(2)ExtendingOutputCurrent1AlkalineCellto3.3V,250mAOutputCurrent(3)HighOutputVoltage,LargeOutputCurrent5Vto12V,300mAOutputCurrentPAGE:2SX1301SX1301SX1301PINASSIGNMENTPINDESCRIPTIONPINNoSOT-26SOT-89-5SYMBOLDESCRIPTTION12EXTOutputpinfordrivingexternalpowertransistor35GNDGround44LXOutputforinternalpowerswitch52VDDPowerSupply63FBFeedbackinputABSOLUTEMAXIMUMRATINGS(Note1)SYMBOLITEMRATINGUNITVDDSupplyVoltage-0.3~7.0VVVLXLXpinSwitchVoltage-0.3~7.0VVVIOVoltageonotherI/Opins-0.3Vto(VDD+0.3V)IOUTLXpinOutputCurrent2.5AIEXTEXTpinDriveCurrent200mAPTR1PackageThermalResistanceSOT-26,ΘJC145W/℃PTR2PackageThermalResistanceSOT-89-5,ΘJC45W/℃TOPTOperatingTemperatureRange-40~125℃TSTGStorageTemperatureRange-65~150℃TSOLDERLeadTemperature(Soldering)260℃,10sNote1:AbsoluteMaximumRatingsarethresholdlimitvaluesthatmustnotbeexceededevenforaninstantunderanycondition.Moreover,suchvaluesforanytwoitemsmustnotbereachedsimultaneously.Operationabovetheseabsolutemaximumratingsmaycausedegradationorpermanentdamagetothedevice.Thesearestressratingsonlyanddonotnecessarilyimplyfunctionaloperationbelowtheselimits.1CEEnablepin.Shut-downwhenCEislowSX1301PAGE:3SX1301SX1301ELECTRICALCHARACTERISTICS(Note2,3,4)(VIN=1.5V,VDD=3.3V,loadcurrent=0,TA=25℃,unlessotherwisespecified.)SYMBOLITEMTESTCONDITIONMINTYPMAXUNITVSTStartupVoltageIL=1mA--0.801.05VVDDOperatingVDDRangeVDDpinVoltage2--6VIOFFShutdownCurrentI(VIN)CEPin=0V,VIN=4.5V--0.011μAISWITCHOFFSwitch-OffCurrentI(VDD)VIN=6V--1425μAISWITCHContinuousSwitchingCurrentVIN=CE=3.3V,VFB=GND0.220.240.7mAINOLOADNoLoadCurrentI(VIN)VIN=1.5V,VOUT=3.3V--56--μAVREFFeedbackReferenceVoltageCloseloop,VDD=3.3V1.2251.251.275VFsSwitchingFrequencyVDD=3.3V400500600KHzDMAXMaximumDutyVDD=3.3V8594--%OnResistance,LXtoVDDVDD=3.3V--0.31.1ΩILIMITLimitCurrentVDD=3.3V11.52AOnResistance,EXTtoVDDVDD=3.3V--4.48.5ΩOnResistance,EXTtoGNDVDD=3.3V--2.458.5Ω△VLINELineRegulationVIN=3.5~6V,IL=1mA--1.255mV/V△VLOADLoadRegulationVIN=2.5V,IL=1~100mA--0.14--mV/mACEtriggerLevelVDD=3.3V0.40.81.2VTSVoutTemperatureCoefficient50ppm/℃△TSDThermalShutdownHysteresis--10--℃Note2:ElectricalCharacteristicsstateDCandACelectricalspecificationsunderparticulartestconditionswhichguaranteespecificperformancelimits.ThisassumesthatthedeviceiswithintherecommendedoperatingRange.Specificationsarenotguaranteedforparameterswherenolimitisgiven,however,thetypicalvalueisagoodindicationofdeviceperformance.Note3:Typicalsaremeasuredat25˚Candrepresenttheparametricnorm.Note4:Datasheetmin/maxspecificationlimitsareguaranteedbydesign,test,orstatisticalanalysis.PAGE:4SIMPLIFIEDBLOCKDIAGRAMTYPICALOPERATINGCHARACTERISTICS(1)Efficiency(1.1)Vout=3.3VEfficiency@Vout=3.3V50.00%60.00%70.00%80.00%90.00%100.00%0102030405060708090100110120130140150Iout(mA)Efficiency1.0V1.5V3.0V(1.2)Vout=5.0VEfficiency@Vout=5.0V50.00%60.00%70.00%80.00%90.00%100.00%0306090120150180210240270300Iout(mA)Efficiency1.5V3.0V4.5V(2)LineRegulation(2.1)Vout=3.3VLineRegulation@Vout=3.3V3.23.253.33.353.401234Vin(V)Vout(V)Io=1mAIo=5mAIo=10mAIo=25mAIo=50mAIo=100mAIo=150mAIo=300mA(2.2)Vout=5.0VLineRegulation@Vout=5.0V4.94.914.924.934.944.954.964.974.984.995012345Vin(V)Vout(V)Io=1mAIo=5mAIo=10mAIo=25mAIo=50mAIo=100mAIo=150mAIo=300mAPAGE:5TYPICALOPERATINGCHARACTERISTICS(3)LoadRegulation(3.1)Vout=3.3VLoadRegulation@Vout=3.3V3.23.253.33.353.40.11101001000Iout(mA)Vout(V)1.0V1.5V3.0V(3.2)Vout=5.0VLoadRegulation@Vout=5.0V4.94.914.924.934.944.954.964.974.984.9950.11101001000Iout(mA)Vout(V)1.5V3.0V4.5VAPPLICATIONINFORMATION1)OutputVoltageSettingReferringtoTypicalApplicationCircuit1,theoutputvoltageofswitchingregulator(Vout)issetwithfollowingequation:Vout=(1+R1/R2)*Vfb2)FeedbackLoopDe