SY8089

ApplicationNote:AN_SY8089/SY8089AHighEfficiency5.5V,2Acontinuous,3Apeak,1MHzSynchronousStepDownRegulatorAN_SY8089/ARev.0.9ASilergyCorp.Confidential-PreparedforCustomerUseOnly1GeneralDescriptionTheSY8089andSY8089Aarehigh-efficiency,highfrequencysynchronousstep-downDC-DCregulatorICcapableofdeliveringupto2Aoutputcurrent.TheSY8089andSY8089Aoperateoverawideinputvoltagerangefrom2.7Vto5.5VandintegratemainswitchandsynchronousswitchwithverylowRDS(ON)tominimizetheconductionloss.Lowoutputvoltagerippleandsmallexternalinductorandcapacitorsizesareachievedwithgreaterthan1MHzswitchingfrequency.SY8089integratesshortcircuitandover-voltagelatchoffprotection.OrderingInformationPackageCodeTemperatureCodeOptionalSpecCode□□□□(□□□□□□□□)□□□□SY8089PackageCodeTemperatureCodeOptionalSpecCode□□□□(□□□□□□□□)□□□□SY8089TemperatureRange:-40°Cto85°COrderingNumberPackagetypeNoteSY8089AACSOT23-5SY8089AAACSOT23-5Features•LowRDS(ON)forinternalswitches(top/bottom):110mΩ/80mΩ•2.7-5.5Vinputvoltagerange•2Acontinuous,3Apeakloadcurrentcapability•1MHzswitchingfrequencyminimizestheexternalcomponents•Internalsoftstartlimitstheinrushcurrent•Reliableshortcircuitprotection:
SY8089:Latchoffprotection
SY8089A:Hic-cupmodeprotection•Reliableover-voltageprotection:
SY8089:Latchoffprotection
SY8089A:Nolatchoffprotection•100%dropoutoperation•RoHSCompliantandHalogenFree•Compactpackage:SOT23-5Applications•LCDTV•SetTopBox•NetPC•Mini-NotebookPC•AccessPointRouterTypicalApplicationsENGNDLXFBVOUT:1.8VCIN22µFCOUT22µFх2R2100kVIN:2.7-5.5VINR1200kC122pFL1:2.2µHON/OFF41253Efficiency(%)Figure1.SchematicdiagramFigure2.EfficiencyvsLoadCurrentSY8089/8089AAN_SY8089/ARev.0.9ASilergyCorp.Confidential-PreparedforCustomerUseOnly2Pinout(topview)SOT23-5PartNumberPackagetypeTopMark①①①①SY8089AACSOT23-5JXxyzSY8089AAACSOT23-5KVxyzNote①：x=yearcode,y=weekcode,z=lotnumbercodePinNamePinNumberPinDescriptionEN1Enablecontrol.Pullhightoturnon.Donotfloat.GND2Groundpin.LX3Inductorpin.Connectthispintotheswitchingnodeofinductor.IN4Inputpin.DecouplethispintoGNDpinwithatleast10μFceramiccap.FB5OutputFeedbackPin.Connectthispintothecenterpointoftheoutputresistordivider(asshowninFigure1)toprogramtheoutputvoltage:Vout=0.6*(1+R1/R2).AbsoluteMaximumRatings(Note1)SupplyInputVoltage------------------------------------------------------------------------------------------------0.3Vto6.0VEnable,FBVoltage-------------------------------------------------------------------------------------------0.3VtoVIN+0.6VPowerDissipation,PD@TA=25°C,SOT23-5--------------------------------------------------------------------------------------------------------------0.6WPackageThermalResistance(Note2)θJA---------------------------------------------------------------------------------------------------------------170°C/WθJC----------------------------------------------------------------------------------------------------------------130°C/WJunctionTemperatureRange------------------------------------------------------------------------------------40°Cto150°CLeadTemperature(Soldering,10sec.)-----------------------------------------------------------------------------------260°CStorageTemperatureRange--------------------------------------------------------------------------------------65°Cto150°CRecommendedOperatingConditions(Note3)SupplyInputVoltage------------------------------------------------------------------------------------------------2.7Vto5.5VJunctionTemperatureRange-------------------------------------------------------------------------------------40°Cto125°CAmbientTemperatureRange--------------------------------------------------------------------------------------40°Cto85°CSY8089/8089AAN_SY8089/ARev.0.9ASilergyCorp.Confidential-PreparedforCustomerUseOnly3BlockDiagram(SY8089)(SY8089A)SY8089/8089AAN_SY8089/ARev.0.9ASilergyCorp.Confidential-PreparedforCustomerUseOnly4ElectricalCharacteristics(VIN=5V,VOUT=2.5V,L=2.2μH,COUT=22μF,TA=25°C,unlessotherwisespecified)ParameterSymbolTestConditionsMinTypMaxUnitInputVoltageRangeVIN2.75.5VQuiescentCurrentIQIOUT=0,VFB=VREF⋅105%55μAShutdownCurrentISHDNEN=00.11μAFeedbackReferenceVoltageVREF0.5880.60.612VFBInputCurrentIFBVFB=VIN-5050nAPFETRONRDS(ON),P110mΩNFETRONRDS(ON),N80mΩPFETCurrentLimitILIM3.5AENrisingthresholdVENH1.5VENfallingthresholdVENL0.4VInputUVLOthresholdVUVLO2.5VUVLOhysteresisVHYS0.2VOscillatorFrequencyFOSCIOUT=500mA1MHzShortCircuitProtectionLatchOffThresholdVSCP0.25VMinONTime75nsMaxDutyCycle100%SoftStartTimeTSS1.2msOutputDischargeSwitchOnResistanceRDISCH50ΩThermalShutdownTemperatureTSD160°CNote1:Stressesbeyondthe“AbsoluteMaximumRatings”maycausepermanentdamagetothedevice.Thesearestressratingsonly.Functionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedintheoperationalsectionsofthespecificationisnotimplied.Exposuretoabsolutemaximumratingconditionsforextendedperiodsmayaffectdevicereliability.Note2:Testcondition:Devicemountedon2”x2”FR-4substratePCB,2ozcopper,withminimumrecommendedpadontoplayerandthermalviastobottomlayergroundplane.Note3:Thedeviceisnotguarantee