LDO稳压器 BL9198_V2.0_en.pdf

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LDO稳压器 BL9198_V2.0_en.pdf

PPMICBUBL9198Rev2.08/20141BL9198300mAUltra-lowNoise,Ultra-FastCMOSLDORegulator300mAUltra-lowNoise,Ultra-FastCMOSLDORegulatorFEATURESUltra-lowNoiseforRFApplicationUltra-FastResponseinLine/LoadTransient1.2V,IOUT=0mA90130ADropoutVoltageVDROPIOUT=200mA,VOUT=2.8V130180mVIOUT=300mA,VOUT=2.8V210300LineRegulation(Note7)VLINEVIN=3.6Vto5.5VIOUT=1mA0.050.17%/VLoadRegulation(Note8)VLOAD1mA<IOUT1FontheBL9198inputandtheamountofcapacitancecanbeincreasedwithoutlimit.Theinputcap-acitormustbelocatedadistanceofnotmorethan0.5inchfromtheinputpinoftheICandreturnedtoacleananalogground.Anygoodqualityceramicortantalumcanbeusedforthiscapacitor.ThecapacitorwithlargervalueandlowerESR(equi-valentseriesresistance)providesbetterPSRRandline-transientresponse.Theoutputcapacitormustmeetbothrequi-rementsforminimumamountofcapa-citanceandESRinallLDOsapplication.TheBL9198isdesignedspecificallytoworkwithlowESRceramicoutputcapa-citorinspace-savingandperformanceconsideration.Usingaceramiccapacitorwhosevalueisatleast1FwithESRis25montheBL9198outputensuresstability.TheBL9198stillworkswellwithoutputcapacitorofothertypesduetothewidestableESRrange.Outputcapacitoroflargercapacitancecanreducenoiseandimproveloadtransientresponse,stability,andPSRR.Theoutputcapacitorshouldbelocatednotmorethan0.5inchfromtheVOUTpinoftheBL9198andreturnedtoacleananalogground.EnableFunctionTheBL9198featuresanLDOregulatoren-able/disablefunction.ToassuretheLDOregulatorwillswitchon;theENturnoncontrollevelmustbegreaterthan1.2volts.TheLDOregulatorwillgointotheshut-downmodewhenthevoltageontheENpinfallsbelow0.4volts.Fortoprotectthesystem,theBL9198haveaquickdis-chargefunction.Iftheenablefunctionisnotneededinaspecificapplication,itmaybetiedtoVINtokeeptheLDOregulatorinacontinuouslyonstate.ThermalConsiderationsThermalprotectionlimitspowerdissipationinBL9198.Whentheoperationjunctiontemperatureexceeds165C,theOTPcircuitstartsthethermalshutdownfunctionturnthepasselementoff.Thepasselementturnsonagainafterthejunctiontemperaturecoolsby30C.Forcontinueoperation,donotexceedabsolutemaximumoperationjunctiontemperature125C.Thepowerdissipationdefinitionindeviceis:PD(MAX)=(TJ(MAX)TA)/JAWhereTJ(MAX)isthemaximumoperationjunctiontemperature125C,TAistheambienttemperatureandtheJAisthejunctiontoambientthermalresistance.Forrecommendedoperatingconditionsspe-cificationofBL9198,whereTJ(MAX)isthemaximumjunctiontemperatureofthedie(125C)andTAisthemaximumambienttemperature.Thejunctiontoambientthe-rmalresistance(JAislayoutdependent)forSOT-23-5packageis250C/W,SC-70-5packageis333C/W,onstandardJEDEC51-3thermaltestboard.Themax-imumpowerdissipationatTA=25Ccanbecalculatedbyfollowingformula:PD(MAX)=(125C25C)/333=300mW(SC-70-5)PPMICBUBL9198Rev1.93/20119BL9198300mAUltra-lowNoise,Ultra-FastCMOSLDORegulator300mAUltra-lowNoise,Ultra-FastCMOSLDORegulatorPD(MAX)=(125C25C)/250=400mW(SOT-23-5)ThemaximumpowerdissipationdependsonoperatingambienttemperatureforfixedTJ(MAX)andthermalresistanceJA.ItisalsousefultocalculatethejunctionoftemperatureoftheBL9198underasetofspecificconditions.InthisexamplelettheInputvoltageVIN=3.3V,theoutputcurrentIo=300mAandthecasetemperatureTA=40Cmeasuredbyathermalcoupleduringoperation.ThepowerdissipationfortheVOUT=2.8VversionoftheBL9198canbecalculatedas:PD=(3.3V2.8V)300mA+3.6V100uA=150mWAndthejunctiontemperature,TJ,canbecalculatedasfollows:TJ=TA+PDJA=40C+0.15W250C/W=40C+37.5C=77.5C<TJ(MAX)=125CForthisoperatingcondition,TJislowerthantheabsolutemaximumoperatingjunctiontemperature,125C,soitissafetousetheBL9198inthisconfiguration.LayoutconsiderationsToimproveacperformancesuchasPSRR,outputnoise,andtransientresponse,itisrecommendedthatthePCBbedesignedwithseparategroundplanesforVINandVOUT,witheachgroundplaneconnectedonlyattheGNDpinofthedevice.qq2355607588PPMICBUBL9198Rev1.93/201110BL9198300mAUltra-lowNoise,Ultra-FastCMOSLDORegulator300mAUltra-lowNoise,Ultra-FastCMOSLDORegulatorBL9198-2.8VLayoutCircuitTOPLayerLayoutBOTTOMLayerLayoutVINVOUTBL9198VIN1GND2EN3NC4VOUT5JP112233VINC21uFC41uFC11uFVINPPMICBUBL9198Rev1.93/201111BL9198300mAUltra-lowNoise,Ultra-FastCMOSLDORegulator300mAUltra-lowNoise,Ultra-FastCMOSLDORegulatorPackageDescriptionSymbolDimensionsInMillimetersDimensionsInInchesMinMaxMinMaxA0.8001.1000.0310.044A10.0000.1000.0000.004B1.1501.3500.0450.054b0.1500.4000.0060.016C1.8002.4500.0710.096D1.8002.2500.0710.089e0.6500.026H0.0800.2600.0030.010L0.2100.4600.0080.018SC-70-5SurfaceMountPackagePPMICBUBL9198Rev1.93/201112BL9198300mAUltra-lowNoise,Ultra-FastCMOSLDORegulator300mAUltra-lowNoise,Ultra-FastCMOSLDORegulatorPackagetypeSC70-5Numberofdevicesperreel3000TapedimensionTapingreeldimensionPPMICBUBL9198Rev1.93/201113BL9198300mAUltra-lowNoise,Ultra-FastCMOSLDORegulator300mAUltra-lowNoise,Ultra-FastCMOSLDORegulatorSymbolDimensionsInMillimetersDimensionsInInchesMinMaxMinMaxA0.8891.2950.0350.051A10.0000.1520.0000.006B1.3971.8030.0550.071b0.3560.5590.0140.022C2.5912.9970.1020.118D2.6923.0990.1060.122e0.8381.0410.0330.041H0.0800.2540.0030.010L0.3000.6100.0120.024SOT-23-5SurfaceMountPackagePPMICBUBL9198Rev1.93/201114BL9198300mAUl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