輸入電壓50-ma穩(wěn)壓器

ZHCS515–DECEMBER查詢樣品 說寬輸入電壓:7V至28 TPS7A42是一款可耐受電壓的線性穩(wěn)壓器，其

28V的連續(xù)DC或瞬態(tài)輸入電壓。 TPS7A42可在采用任何大于4.7μF的輸出電容和任 大于1μF的輸入電容時保持穩(wěn)定（在整個溫度及容關斷時的靜態(tài)電流：4.1 將由于其微型封裝(MSOP-8)及有可能很小的輸出CMOS邏輯電平兼容型使能引 容器之故而非常之小。此外，TPS7A42還具有一個可調輸出電壓：~1.175Vto26 兼容標準CMOS邏輯的使能引腳(EN)，用于實現(xiàn)一 輸入電容：≥輸出電容：≥工作溫度范圍：–40°C

40°C+125°C此外，TPS7A42還非常適合于依靠電信及工業(yè)應用中供一個經(jīng)過良好調節(jié)的電壓軌，而且還能承受及快應 LED

DGN3-mm5-mmMSOP-8PowerPAD(TOPVIEW)12348712348765

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddi erstheretoappearsattheendofthisdatasheet.PowerPADisatrademarkofTexasCopyright?2011,TexasInstrumentsAllothertrademarksaretheCopyright?2011,TexasInstrumentsPRODUCTIONDATAinformationiscurrentasofpublicationdate.ProductsconformtospecificationsperthetermsoftheInstrumentsstandardwarranty.Productionprocessingdoes EnglishDataSheet:necessarilyincludetestingofallThisintegratedcircuitcanbedamagedbyESD.TexasInstruments mendsthatallintegratedcircuitsbehandledwithappropriateprecautions.Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.Precisionintegratedcircuitsmaybemoresusceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.ORDERINGTPS7A4201yyyYYYispackageZispackage(1)ForthemostcurrentpackageandorderinginformationseethePackageOptionAddendumattheendofthis,orvisitthedeviceproductfolderon UMOveroperating-airtemperaturerange(unlessotherwiseINpintoGNDVOUTpintoGNDVOUTpintoINVFBpintoGNDVFBpintoINVENpintoINENpintoGNDVPeakInternallyOperatingvirtualjunction,Storage,ElectrostaticdischargeHumanbodymodelChargeddevicemodelV(1)StressesthoselistedunderAbsoluteumRatingsmaycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsthoseindicatedisnotimplied.Exposureto umratedconditionsforextendedperiodsmayaffectdevicereliability.THERMALTHERMALDGN8(1)有關傳統(tǒng)和新的熱度量的信息，請參閱IC封裝熱度量應用報告SPRA953DISSIPATIONABOVETA=≤(1)TheJEDECHigh-K(2s2p)boarddesignusedtoderivethisdatawasa3-inchx3-inchmultilayerboardwith2-ounceinternalpowerandgroundnesand2-ouncecoppertracesontopandbottomoftheboard.ELECTRICALAtTJ=–40°Cto+125°C,VIN=VOUT(NOM)+2.0VorVN=7.0V(whicheverisgreater),VEN=VN,IOUT=100μA,CIN=1μF,COUT=4.7andFBtiedtoOUT,unlessotherwiseTESTInputvoltageVInternalTJ=+25°C,VFB=VREF,VIN=9V,IOUT=25VOutputvoltageVN≥VOUT(NOM)+2.0VNominalTJ=+25°C,VIN=9V,IOUT=25OverallVOUT(NOM)+2.0V≤VIN≤24V(2)100μA≤IOUT≤50mALine7V≤VN≤28Load100μA≤IOUT≤50DropoutVN=17V,VOUT(NOM)=18V,IOUT=20VN=17V,VOUT(NOM)=18V,IOUT=50VILCurrentVOUT=90%VOUT(NOM),VN=7.0V,TJ≤VOUT=90%VOUT(NOM),VN=9.0Ground7V≤VN≤28V,IOUT=0IOUT=50ShutdownsupplyVEN=+0.4IFeedbackEnable7V≤VN≤28V,VN=Enablehigh-level VEnablelow-level0VOutputnoiseVN=12V,VOUT(NOM)=VREF,COUT=10BW=10Hzto100VN=12V,VOUT(NOM)=5V,COUT=10μF, (4)=10nF,BW=10Hzto100kHzPower-supplyrejectionVIN=12V,VOUT(NOM)=5V,COUT=10μF, (4)=10nF,f=100HzThermalshutdownShutdown,temperatureReset,temperatureToensurestabilityatno-loadconditions,acurrentfromthefeedbackresistivenetworkgreaterthanorequalto10μAis uminputvoltageislimitedto24Vbecauseofthepackagepowerdissipationlimitationsatfullload(P≈(VIN–VOUT)×IOUT=(24V–VREF)×50mA≈1.14W).Thedeviceiscapableofsourcinga umcurrentof50mAathigherinputvoltagesaslongasthepowerdissipatediswithinthethermallimitsofthepackageplusanyexternalheatsinking.IFB>0flowsoutoftheCBYPreferstoabypasscapacitorconnectedtotheFBandOUTFUNCTIONALBLOCK

DEVICE

TYPICALAPPLICATION

OUT10

VOUT10A,andR1+R2VR1=

OUT1ExampleCircuit izeTransientPIN(TOP PIN5ThispinturnstheregulatoronorIfVEN≥VEN_HItheregulatorisenabled.IfVEN≤VEN_LO,theregulatorisdisabled.Ifnotused,theENpincanbeconnectedtoIN.MakesurethatVEN≤VNatall2Thispinistheinputtothecontrol-looperroramplifier.Itisusedtosettheoutputvoltageofthe48Input3,6,Notinternallyconnected.Thispinmusteitherbeleftopenortiedto1Regulatoroutput.Acapacitorgreaterthan4.7μFmustbetiedfromthispintogroundtoassureSoldertoprintedcircuitboard(PCB)toenhancethermalNOTE:ThePowerPADisinternallyconnectedtoAlthoughitcanbeleftfloating,itis mendedtoconnectthePowerPADtotheGNDTYPICALAtTJ=–40°Cto+125°C,VIN=VOUT(NOM)+2.0VorVN=9.0V(whicheverisgreater),VEN=VIN,IOUT=100μA,CIN=1COUT=4.7μF,andFBtiedtoOUT,unlessotherwiseLOADTRANSIENT LINEIOUT=1mA29mA1mA

5VOUTVOUTNOM Time

InputVoltageFigure FigureFEEDBACK QUIESCENTCURRENTvsINPUTI=0

VVI

InputVoltage InputVoltage Figure FigureFEEDBACK GROUND IFBIIFBIGND ?40?25?10 203550658095110Temperature

OutputCurrentFigure FigureTYPICALCHARACTERISTICS(AtTJ=–40°Cto+125°C,VIN=VOUT(NOM)+2.0VorVIN=9.0V(whicheverisgreater),VEN=VN,IOUT=100μA,CN=1COUT=4.7μF,andFBtiedtoOUT,unlessotherwiseDROPOUT ENABLETHRESHOLD VDROPVDROP1

2VENVEN10

0 OutputCurrent

?40?25?10 203550658095110TemperatureFigure FigureOUTPUTSPECTRALNOISE CURRENT 1Noise(Noise(V/ICL0

Frequency

InputVoltageFigure FigurePSRRPSRR0

POWER-SUPPLYREJECTION FrequencyFigureTHEORYOFGENERALTheTPS7A4201belongstoanewgenerationoflinearregulatorsthatuseaninnovativeBiCMOSprocesstechnologytoachieveveryhighuminputandoutputvoltages.ThisprocessnotonlyallowstheTPS7A4201tomaintainregulationduringveryfastvoltagetransientsupto28V,butitalsoallowstheTPS7A4201toregulatefromacontinuoushigh-voltageinputrail.Unlikeotherregulatorscreatedusingbipolartechnology,theTPS7A4201groundcurrentisalsoconstantoveritsoutputcurrentrange,resultinginincreasedefficiencyandlowerpowerconsumption.Thesefeatures,combinedwithahighthermalperformanceMSOP-8PowerPADpackage,makethisdeviceidealforindustrialand ADJUSTABLETheTPS7A4201hasanoutputvoltagerangeof~1.175Vto26V.Thenominaloutputvoltageofthedeviceissetbytwoexternalresistors,asshowninFigure12.10

OUT10Figure12.AdjustableOperation umACR1andR2canbecalculatedforanyoutputvoltagerangeusingtheformulashowninEquation1.Toensurestabilityunderno-loadconditions,thisresistivenetworkmustprovideacurrentgreaterthanorequalto10μA.R1=

1,

10

Ifgreatervoltageaccuracyisrequired,takeintoaccounttheoutputvoltageoffsetcontributionsbecauseofthefeedbackpincurrentanduse0.1%toleranceresistors.ENABLEPINTheTPS7A4201providesanenablepin(EN)featurethatturnsontheregulatorwhenVEN>1.5 Lowequivalentseries (ESR)capacitorsshouldbeusedfortheinput,output,andbypasscapacitors.CeramiccapacitorswithX7RandX5Rdielectricsarepreferred.Thesedielectricsoffermorestablecharacteristics.CeramicX7Rcapacitorsofferimprovedover-temperatureperformance,whileceramicX5Rcapacitorsarethemostcost-effectiveandareavailableinhighervalues.NotethathighESRcapacitorsmaydegradeINPUTANDOUTPUTCAPACITORTheTPS7A4201highvoltagelinearregulatorachievesstabilitywithaminimumoutputcapacitanceof4.7μFandinputcapacitanceof1μF;however,itishighly mendedtouse10-μFoutputandinputcapacitorstoizeacperformance.BYPASSCAPACITORAlthoughabypasscapacitor(CBYP)isnotneededtoachievestability,itishighly mendedtousea10-nFbypasscapacitortoizeacperformance(includinglinetransient,noiseandPSRR).UMACInorderto izelinetransient,noise,andPSRRperformance,itis mendedtoinclude10-μF(orhigher)inputandoutputcapacitors,anda10-nFbypasscapacitor,asshowninFigure12.Thesolutionshowndeliversminimumnoiselevelsof58μVRMSandpower-supplyrejectionlevelsabove36dBfrom10Hzto10MHz.TRANSIENTAswithanyregulator,increasingthesizeoftheoutputcapacitorreducesover/undershootmagnitudebutincreasesdurationofthetransientresponse.NotethatthepresenceoftheCBYPcapacitormaygreatlyimprovetheTPS7A4201linetransientresponse,asnotedin.TRANSIENTVOLTAGEPROTECTIONOneoftheprimaryapplicationsoftheTPS7A4201istoprovidetransientvoltageprotectiontosensitivecircuitrythatmaybedamagedinthepresenceofhigh-voltagees.Thistransientvoltageprotectioncanbemorecost-effectiveandcompactcomparedtotopologiesthatuseatransientvoltagesuppression(TVS)block.LEDARRAYILED=28TheTPS7A4201canbeusedtodriveILED=28Figure13.LEDArrayDriverTheTPS7A4201highvoltageratingmakesitsuitablenotonlyfordrivingtheintensityofanarrayofmultipleLEDsbyusinga signalatitsENpin,butalsoforcontrollingsuchanarray.Thissignalenablesanddisablestheregulator,causingtheLEDlighttovaryitsintensity.Whenevertheregulatorisdisabled,nocurrentflowsthroughtheLEDarray.ThisconditionmeansthattheregulatorhasthesamehighvoltageappliedtothefirstLEDinthearrayasisappliedtotheregulatorinput.Figure14illustratesthesolutiontothisproblemwiththeadditionoftheTPS7A4201high-voltageregulator.I=0I=02828Figure14.LEDArrayDriverwithRegulatorPACKAGESolderpadfootprint mendationsfortheTPS7A4201areavailableattheendofthisproductdatasheetandBOARD MENDATIONSTOIMPROVEPSRRANDNOISEToimproveacperformancesuchasPSRR,outputnoise,andtransientresponse,itis mendedthattheboardbedesignedwithseparategroundnesforINandOUT,witheachgroundneconnectedonlyattheGNDpinofthedevice.Inaddition,thegroundconnectionfortheoutputcapacitorshouldconnectdirectlytotheGNDpinofthedevice.Equivalentseriesinductance(ESL)andESRmustbeminimizedinorderto izeperformanceandensurestability.Everycapacitor(CIN,COUT,CBYP)mustbecedascloseaspossibletothedeviceandonthesamesideofthePCBastheregulatoritself.DonotceanyofthecapacitorsontheoppositesideofthePCBfromwheretheregulatorisinstalled.Theuseofviasandlongtracesisstronglydiscouragedbecausetheymayimpactsystemperformancenegativelyandevencauseinstability.Ifpossible,andtoensurethe umperformancedenotedinthisproductdatasheet,usethesamelayoutpatternusedforTPS7A42evaluationboard,availableatTHERMALThermalprotectiondisablestheoutputwhenthejunctiontemperaturerisestoapproximay+170°C,allowingthedevicetocool.Whenthejunctiontemperaturecoolstoapproximay+150°C,theoutputcircuitryisenabled.Dependingonpowerdissipation,thermal ,andambienttemperature,thethermalprotectioncircuitmaycycleonandoff.Thiscyclinglimitsthedissipationoftheregulator,protectingitfromdamageasaresultofAnytendencytoactivatethethermalprotectioncircuitindicatesexcessivepowerdissipationoraninadequateheatsink.Forreliableoperation,junctiontemperatureshouldbelimitedtoaumof+125°C.Toestimatethemarginofsafetyinacompletedesign(includingheatsink),increasetheambienttemperatureuntilthethermalprotectionistriggered;useworst-caseloadsandsignalconditions.Forgoodreliability,thermalprotectionshouldtriggeratleast+35°Cabovethe umexpectedambientconditionoftheparticularapplication.Thisconfigurationproducesaworst-casejunctiontemperatureof+125°Catthehighestexpectedambienttemperatureandworst-caseload.TheinternalprotectioncircuitryoftheTPS7A4201hasbeendesignedtoprotectagainstoverloadconditions.Itwasnotintendedtoreceproperheatsinking.ContinuouslyrunningtheTPS7A4201intothermalshutdowndegradesdevicereliability.POWERTheabilitytoremoveheatfromthedieisdifferentforeachpackagetype,presentingdifferentconsiderationsinthePCBlayout.ThePCBareaaroundthedevicethatisofothercomponentsmovestheheatfromthedevicetotheambientair.PerformancedataforJEDEClow-andhigh-KboardsaregivenintheDissipationRatingsTable.Usingheaviercopperincreasestheeffectivenessinremovingheatfromthedevice.Theadditionoftedthrough-holestoheatdissipatinglayersalsoimprovestheheatsinkeffectiveness.Powerdissipationdependsoninputvoltageandloadconditions.Powerdissipation(PD)isequaltotheproductoftheoutputcurrenttimesthevoltagedropacrosstheoutputpasselement,asshowninEquation2:PD=(VINVOUT) PACKAGEOPTIONPACKAGINGOrderablePackageEcoLead/BallMSLPeakOpTempTop-Side8&noSb/Br)CU-40to8&noSb/Br)CU-40to(1)ThemarketingstatusvaluesaredefinedasACTIVE:Product mendedfornewLIFEBUY:TIhasannouncedthatthedevicewillbedis,andalifetime-buyperiodisinNRND: mendedfornewdesigns.Deviceisinproductiontosupportexistingcustomers,butTIdoes mendusingthispartinanewPREVIEW:Devicehasbeenannouncedbutisnotinproduction.SamplesmayormaynotbeOBSOLETE:TIhasdistheproductionofthe(2)Econ-Thennedeco-friendlyclassification:Pb-(RoHS),Pb-(RoHSExempt),orGreen(RoHS&noSb/Br)-pleasecheck informationandadditionalproductcontentdetails.TBD:ThePb-/Green nhasnotbeenPb-(RoHS):TI'sterms"Lead- "or"Pb-"meansemiconductorproductsthatarecompatiblewiththecurrentRoHSrequirementsforall6substances,includingtherequirementthatleadnotexceed0.1%byweightinhomogeneousmaterials.Wheredesignedtobesolderedathightemperatures,TIPb-productsaresuitableforuseinspecifiedlead-processes.Pb-(RoHSExempt):ThiscomponenthasaRoHSexemptionforeither1)lead-basedflip-chipsolderbumpsusedbetweenthedieandpackage,or2)lead-baseddieadhesiveusedbetweenthedieandleadframe.ThecomponentisotherwiseconsideredPb-(RoHScompatible)asdefinedabove.Green(RoHS&noSb/Br):TIdefines"Green"tomeanPb-(RoHScompatble),andofBromine(Br)andAntimony(Sb)basedflameretardants(BrorSbdonotexceed0.1%byweightinhomogeneousmaterial)(3)MSL,PeakTemp.--TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksolder(4)MultipleTop-SideMarkingswillbeinsideparentheses.OnlyoneTop-SideMarkingcontainedinparenthesesandseparatedbya"~"willappearonadevice.Ifalineisindentedthenitisa