TPS737XX资料

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1ALow-DropoutRegulatorwithReverseCurrentProtection

FEATURES

••••••••••

Stablewith1.0µForLargerCeramicOutputCapacitor

InputVoltageRange:2.2Vto5.5V

Ultra-LowDropoutVoltage:130mVtypat1AExcellentLoadTransientResponse—EvenWithOnly1.0µFOutputCapacitor

NMOSTopologyDeliversLowReverseLeakageCurrent

0.5%InitialAccuracy

3%OverallAccuracyOverLine,Load,andTemperature

LessThan20nAtypicalIQinShutdownModeThermalShutdownandCurrentLimitforFaultProtection

AvailableinMultipleOutputVoltageVersions–AdjustableOutput:1.20Vto5.5V

–CustomOutputsAvailableUsingFactoryPackage-LevelProgramming

DESCRIPTION

TheTPS737xxfamilyoflinearlow-dropout(LDO)voltageregulatorsusesanNMOSpasselementinavoltage-followerconfiguration.ThistopologyisrelativelyinsensitivetooutputcapacitorvalueandESR,allowingawidevarietyofloadconfigurations.Loadtransientresponseisexcellent,evenwithasmall1.0µFceramicoutputcapacitor.TheNMOStopologyalsoallowsverylowdropoutforthediesizeused.

TheTPS737xxfamilyusesanadvancedBiCMOSprocesstoyieldhighprecisionwhiledeliveringverylowdropoutvoltagesandlowgroundpincurrent.Currentconsumption,whennotenabled,isunder1µAandidealforportableapplications.Thesedevicesareprotectedbythermalshutdownandfoldbackcurrentlimit.

APPLICATIONS

•••

PointofLoadRegulationforDSPs,FPGAs,ASICs,andMicroprocessors

Post-RegulationforSwitchingSuppliesPortable/Battery-PoweredEquipment

DCQ󰀀PACKAGE

SOT223(TOP󰀀VIEW)

VOUT1.0mF

ENGNDFBTAB󰀀IS󰀀GNDOptionalVININOUTTPS737xx12345INTypical󰀀Application󰀀CircuitGNDENOUTFB/NCPleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.ProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.Productionprocessingdoesnotnecessarilyincludetestingofallparameters.

Copyright©2006,TexasInstrumentsIncorporated

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ThisintegratedcircuitcanbedamagedbyESD.TexasInstrumentsrecommendsthatallintegratedcircuitsbehandledwithappropriateprecautions.Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.

ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.Precisionintegratedcircuitsmaybemoresusceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.

ORDERINGINFORMATION(1)

PRODUCTTPS737xxyyyz

VOUT(2)

XXisnominaloutputvoltage(forexample,25=2.5V,01=Adjustable(3)).YYYispackagedesignator.Zispackagequantity.

(1)(2)(3)ForthemostcurrentpackageandorderinginformationseethePackageOptionAddendumattheendofthisdocument,orseetheTIwebsiteatwww.ti.com.

Mostoutputvoltagesfrom1.5Vto5.0Vin100mVincrementsareavailableonaquick-turnbasisusinginnovativefactorypackage-levelprogramming.Minimumorderquantitiesapply;contactfactoryfordetailsandavailability.Forfixed1.2Voperation,tieFBtoOUT.

ABSOLUTEMAXIMUMRATINGS

overoperatingfree-airtemperaturerangeunlessotherwisenoted(1)

TPS737xx

VINrangeVENrangeVOUTrangePeakoutputcurrentOutputshort-circuitdurationContinuoustotalpowerdissipationJunctiontemperaturerange,TJStoragetemperaturerangeESDrating,HBMESDrating,CDM(1)

–0.3to+6.0–0.3to+6.0–0.3to+5.5Internallylimited

Indefinite

SeeDissipationRatingsTable

–55to+150–65to+150

2500

°C°CkVVUNITVVV

StressesbeyondthoselistedunderAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedundertheElectricalCharacteristicsisnotimplied.Exposuretoabsolutemaximumratedconditionsforextendedperiodsmayaffectdevicereliability.

POWERDISSIPATIONRATINGS(1)

BOARDLow-K(2)(1)(2)

PACKAGEDCQ

RθJC15°C/W

RθJA53°C/W

DERATINGFACTORABOVETA=+25°C

18.9mW/°C

TA≤+25°CTA=+70°CTA=+85°CPOWERRATINGPOWERRATINGPOWERRATING

1.W

1.04W

0.76W

SeePowerDissipationintheApplicationssectionformoreinformationrelatedtothermaldesign.

TheJEDECLow-K(1s)boarddesignusedtoderivethisdatawasa3-inch×3-inch,2-layerboardwith2-ouncecoppertracesontopoftheboard.

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ELECTRICALCHARACTERISTICS

Overoperatingtemperaturerange(TJ=–40°Cto+125°C),VIN=VOUT(nom)+1.0V(1),IOUT=10mA,VEN=2.2V,andCOUT=2.2µF,unlessotherwisenoted.TypicalvaluesareatTJ=+25°C.

PARAMETER

VINVFB

Inputvoltagerange(1)(2)Internalreference(TPS73701)Outputvoltagerange(TPS73701)

VOUT

Accuracy(1)(3)

∆VOUT%/∆VIN∆VOUT%/∆IOUTVDOZO(DO)ICLISCIREVIGNDISHDNIFBPSRR

NominaloverVIN,IOUT,andT

TJ=+25°C

VOUT+0.5V≤VIN≤5.5V;10mA≤IOUT≤1A

VOUT(nom)+0.5V≤VIN≤5.5V1mA≤IOUT≤1A10mA≤IOUT≤1AIOUT=1A

2.2V≤VIN≤VOUT+VDOVOUT=0.9×VOUT(nom)VOUT=0V

VEN≤0.5V,0V≤VIN≤VOUTIOUT=10mA(IQ)IOUT=1A

VEN≤0.5V,VOUT≤VIN≤5.5f=100Hz,IOUT=1A,VIN=VOUT+1Vf=10kHz,IOUT=1A,VIN=VOUT+1VCOUT=10µF

VOUT=3V,RL=30Ω,COUT=1µF

1.70

VEN=5.5V

Shutdown,temperatureincreasingReset,temperaturedecreasing

–40

20+160+140

+125

1.05

TJ=+25°C

TESTCONDITIONS

MIN2.21.198VFB–1.0–3.0

±0.50.010.0020.00051300.251.500.1400800200.158

dB

3727×VOUT

600

VIN0.5

µVRMSµsVVnA°C°C

0.62.2500

1.20TYP

MAX5.51.2105.5–VDO

+1.0+3.0

%%/V%/mAmVΩAmAµAµAnAµAUNITVVV

Lineregulation(1)LoadregulationDropoutvoltage(4)

(VIN=VOUT(nom)–0.1V)OutputimpedanceindropoutOutputcurrentlimitShort-circuitcurrent

Reverseleakagecurrent(5)(–IIN)GroundpincurrentShutdowncurrent(IGND)FBpincurrent(TPS73701)Power-supplyrejectionratio(ripplerejection)OutputnoisevoltageBW=10Hz–100KHzStartuptime

Enablehigh(enabled)Enablelow(shutdown)Enablepincurrent(enabled)ThermalshutdowntemperatureOperatingjunctiontemperature

VNtSTRVEN(HI)VEN(LO)IEN(HI)TSDTJ(1)(2)(3)(4)(5)

MinimumVIN=VOUT+VDOor2.2V,whicheverisgreater.

ForVOUT(nom)<1.6V,whenVIN≤1.6V,theoutputwilllocktoVINandmayresultinanover-voltageconditionontheoutput.Toavoidthissituation,disablethedevicebeforepoweringdownVIN.

Toleranceofexternalresistorsnotincludedinthisspecification.

VDOisnotmeasuredforfixedoutputversionswithVOUT(nom)<2.3VsinceminimumVIN=2.2V.RefertotheApplicationssectionformoreinformation.

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FUNCTIONALBLOCKDIAGRAMS

IN4MHzCharge󰀀PumpENRefServo27kWBandgapErrorAmpCurrentLimitGND8kW80kWFBR2OUTThermalProtectionStandard󰀀1%Resistor󰀀Values󰀀forCommon󰀀Output󰀀VoltagesVO1.2V1.5V1.8V2.5V2.8V3.0V3.3VR1R1Short23.2kW28.0kW39.2kW44.2kW46.4kW52.3kWR2Open95.3kW56.2kW36.5kW33.2kW30.9kW30.1kWNOTE:VOUT=󰀀(R1+󰀀R2)/R2x󰀀1.204;R1||󰀀R2=󰀀19kWfor󰀀bestaccuracy.Figure1.AdjustableVoltageVersion

IN4MHzCharge󰀀PumpENRefServo27kWBandgapErrorAmpThermalProtectionCurrentLimitR1OUTGND8kWR1+󰀀R2=󰀀80kWR2Figure2.Fixed-VoltageVersion

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PINASSIGNMENTS

DCQ󰀀PACKAGE

SOT223(TOP󰀀VIEW)

TAB󰀀IS󰀀GND12345INGNDENOUTFB/NCTable1.TerminalFunctions

NAMEINGNDENFBOUTNC

SOT223(DCQ)PINNO.

13,TAB542—

DESCRIPTION

UnregulatedinputsupplyGround

Drivingtheenablepin(EN)highturnsontheregulator.Drivingthispinlowputstheregulatorintoshutdownmode.RefertotheShutdownsectionunderApplicationsInformationformoredetails.ENcanbeconnectedtoINifnotused.

Adjustablevoltageversiononly—thisistheinputtothecontrollooperroramplifier,andisusedtosettheoutputvoltageofthedevice.

Regulatoroutput.A1.0µForlargercapacitorofanytypeisrequiredforstability.Notconnected

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TYPICALCHARACTERISTICS

ForallvoltageversionsatTJ=+25°C,VIN=VOUT(nom)+1.0V,IOUT=10mA,VEN=2.2V,andCOUT=2.2µF,unlessotherwise

noted.

LOADREGULATION

0.50.40.3

Referred󰀀to󰀀IOUT=󰀀10mA-40°C+25°C+125°C0.200.15

Referred󰀀to󰀀VIN=󰀀VOUT+󰀀1.0V󰀀at󰀀IOUT=󰀀10mALINEREGULATION

Change󰀀in󰀀VOUT(%)0.20.10-0.1-0.2-0.3-0.4-0.5

0

100200

300400

500600700

Change󰀀in󰀀VOUT(%)0.100.050-0.05-0.10-0.15-0.20

-40°C+125°C+25°C800900100000.51.01.52.02.53.03.54.04.5

IOUT(mA)VIN-VOUT(V)

Figure3.

DROPOUTVOLTAGEvsOUTPUTCURRENT

200180160140

VOUT=󰀀2.5V+125°C180160

+25°C140120

Figure4.

DROPOUTVOLTAGEvsTEMPERATURE

VDO(mV)VDO(mV)-40°C1201008060402000

100200300

400500

600700

8009001000

IOUT(mA)

100806040200-50

-25

0

25

50

75

100

125

150

Temperature󰀀(°C)

Figure5.

OUTPUTVOLTAGEHISTOGRAM

30

IOUT=󰀀10mA25

181614

Figure6.

DROPOUTVOLTAGEDRIFTHISTOGRAM

IOUT=󰀀10mAPercent󰀀of󰀀Units󰀀(%)20151050

Percent󰀀of󰀀Units󰀀(%)-1.0-0.9-0.8-0.7-0.6-0.5-0.4-0.3-0.2-0.100.10.20.30.40.50.60.70.80.91.01210820

VOUTError(%)

Figure7.

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-100-90-80-70-60-50-40-30-20-100102030405060708090100Worst󰀀Case󰀀dVOUT/dT󰀀(ppm/°C)

Figure8.

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TYPICALCHARACTERISTICS(continued)

ForallvoltageversionsatTJ=+25°C,VIN=VOUT(nom)+1.0V,IOUT=10mA,VEN=2.2V,andCOUT=2.2µF,unlessotherwisenoted.

GROUNDPINCURRENTvsOUTPUTCURRENT

2500

VIN=󰀀5.0V2000

3000

IOUT=󰀀1A2500

VIN=󰀀5.0VGROUNDPINCURRENTvsTEMPERATURE

IGND(mA)1500

VIN=󰀀3.3V1000

VIN=󰀀2.2VIGND(mA)200015001000

VIN=󰀀2.2V5000

VIN=󰀀3.3V500

00

200

400

600

800

1000

IOUT(mA)

-50-250255075100125

Temperature󰀀(°C)

Figure9.

GROUNDPINCURRENTINSHUTDOWN

vsTEMPERATURE

1

VENABLE=󰀀0.5VVIN=󰀀VOUT+󰀀0.5VCurrent󰀀Limit󰀀(A)2.01.91.81.71.61.51.41.31.21.1

Figure10.

CURRENTLIMITvsVIN

IGND(mA)0.1

0.01

-50

1.0

-2502550751001252.02.53.03.54.04.55.05.5

Temperature(°C)

VIN(V)

Figure11.

CURRENTLIMITvsTEMPERATURE

2.01.91.8

Figure12.

PSRR(RIPPLEREJECTION)vsFREQUENCY

9080

IOUT=󰀀100mACOUT=󰀀AnyIOUT=󰀀1mACOUT=󰀀10mFIOUT=󰀀1mACOUT=󰀀AnyIOUT=󰀀1mACOUT=󰀀1mFVOUT=󰀀1.2VCurrent󰀀Limit󰀀(A)1.71.61.51.41.31.21.11.0

-50

-25

0

25

50

75

100

125

Temperature󰀀(°C)

Ripple󰀀Rejection󰀀(dB)70605040302010010

100

IO=󰀀100mACO=󰀀1mFIOUT=󰀀100mACOUT=󰀀10mF1k10k100k1M10M

Frequency󰀀(Hz)

Figure13.Figure14.

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TYPICALCHARACTERISTICS(continued)

ForallvoltageversionsatTJ=+25°C,VIN=VOUT(nom)+1.0V,IOUT=10mA,VEN=2.2V,andCOUT=2.2µF,unlessotherwisenoted.

PSRR(RIPPLEREJECTION)vs

VIN–VOUT

403530

1

COUT=󰀀1mFNOISESPECTRALDENSITY

eN(mV/ÖHz)PSRR󰀀(dB)25201510500

Frequency󰀀=󰀀100kHzCOUT=󰀀10mFVOUT=󰀀2.5V0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

0.1

COUT=󰀀10mFIOUT=󰀀150mA0.01

10

100

1k

Frequency󰀀(Hz)

10k

100k

VIN-VOUT(V)

Figure15.

TPS73701

RMSNOISEVOLTAGEvsCFB

605550

1V/div

RL=󰀀20WCOUT=󰀀1mFFigure16.

TPS73701,VOUT=1.5VTURN-ONRESPONSE

VOUT

VN(RMS)4540353025

VOUT=󰀀2.5VCOUT=󰀀0mFR1=󰀀39.2kW10Hz󰀀<󰀀Frequency󰀀<󰀀100kHz100p

CFB(F)

1n

10n

1V/div

0V2VRL=󰀀20WCOUT=󰀀10mFVEN

2010p

100ms/div

Figure17.

TPS73701,VOUT=1.5VTURN-OFFRESPONSE

RL=󰀀20WCOUT=󰀀10mFFigure18.

TPS73701,VOUT=3.3VPOWER-UP/POWER-DOWN

6543

VOUT

VINVOUT1V/div

RL=󰀀20WCOUT=󰀀1mFVolts210

2V1V/div

0VVEN

100ms/div

-1-2

50ms/div

Figure19.Figure20.

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TYPICALCHARACTERISTICS(continued)

ForallvoltageversionsatTJ=+25°C,VIN=VOUT(nom)+1.0V,IOUT=10mA,VEN=2.2V,andCOUT=2.2µF,unlessotherwisenoted.

TPS73701

IFBvsTEMPERATURE

160140120

IENABLEvsTEMPERATURE

10

IENABLE(nA)1

100

IFB(nA)0.1

-25

0

25

50

75

100

125

80604020

0.01

-500-50

-250255075100125

Temperature(°C)Temperature󰀀(°C)

Figure21.

TPS73701

LOADTRANSIENT,ADJUSTABLEVERSION

CFB=󰀀10nFR1=󰀀39.2kW100mV/div

Figure22.

TPS73701

LINETRANSIENT,ADJUSTABLEVERSION

VOUT=󰀀2.5VCFB=󰀀10nFVOUT

COUT=󰀀10mFVOUT

100mV/div

COUT=󰀀10mF4.5V250mA10mAIOUT

3.5VVIN

10ms/div5ms/div

Figure23.Figure24.

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APPLICATIONINFORMATION

TheTPS737xxbelongstoafamilyofnewgenerationLDOregulatorsthatuseanNMOSpasstransistortoachieveultra-low-dropoutperformance,reversecurrentblockage,andfreedomfromoutputcapacitorconstraints.ThesefeaturescombinedwithanenableinputmaketheTPS737xxidealforportableapplications.Thisregulatorfamilyoffersawideselectionoffixedoutputvoltageversionsandanadjustableoutputversion.Allversionshavethermalandover-currentprotection,includingfoldbackcurrentlimit.

Figure25showsthebasiccircuitconnectionsforthefixedvoltagemodels.Figure26givestheconnectionsfortheadjustableoutputversion(TPS73701).

VININENGNDOUTTPS737xxVOUTINPUTANDOUTPUTCAPACITORREQUIREMENTS

Althoughaninputcapacitorisnotrequiredforstability,itisgoodanalogdesignpracticetoconnecta0.1µFto1µFlowequivalentseriesresistance(ESR)capacitoracrosstheinputsupplyneartheregulator.Thiscapacitorcounteractsreactiveinputsourcesandimprovestransientresponse,noiserejection,andripplerejection.Ahigher-valuecapacitormaybenecessaryiflarge,fastrise-timeloadtransientsareanticipatedorthedeviceislocatedseveralinchesfromthepowersource.TheTPS737xxrequiresa1.0µFoutputcapacitorforstability.Itisdesignedtobestableforallavailabletypesandvaluesofcapacitors.InapplicationswhereVIN–VOUT<0.5VandmultiplelowESRcapacitorsareinparallel,ringingmayoccurwhentheproductofCOUTandtotalESRdropsbelow50nΩF.TotalESRincludesallparasiticresistances,includingcapacitorESRandboard,socket,andsolderjointresistance.Inmostapplications,thesumofcapacitorESRandtraceresistancewillmeetthisrequirement.

Figure25.TypicalApplicationCircuitfor

Fixed-VoltageVersions

OUTPUTNOISE

Aprecisionbandgapreferenceisusedtogeneratetheinternalreferencevoltage,VREF.ThisreferenceisthedominantnoisesourcewithintheTPS737xxanditgeneratesapproximately32µVRMS(10Hzto100kHz)atitsoutput.Theregulatorcontrolloopgainsupthereferencenoisewiththesamegainasthereferencevoltage,sothatthenoisevoltageoftheregulatorisapproximatelygivenby:

(R)R2)V

VN+32mVRMS 1+32mVRMS OUT

R2VREF(1)SincethevalueofVREFis1.2V,thisrelationship

reducesto:

VNǒmVRMSǓ+27

VININOUTTPS737xxGNDFBVOUTR1CFBENR2VOUT=(R1+󰀀R2)R1´1.204Figure26.TypicalApplicationCircuitfor

Adjustable-VoltageVersionsR1andR2canbecalculatedforanyoutputvoltageusingtheformulashowninFigure26.SampleresistorvaluesforcommonoutputvoltagesareshowninFigure2.

Forbestaccuracy,maketheparallelcombinationofR1andR2approximatelyequalto19kΩ.This19kΩ,inadditiontotheinternal8kΩresistor,presentsthesameimpedancetotheerrorampasthe27kΩbandgapreferenceoutput.Thisimpedancehelpscompensateforleakagesintotheerrorampterminals.

ǒmVVǓ V

RMS

OUT

(V)

(2)

Connectingafeedbackcapacitor,CFB,fromtheoutputtotheFBpinreducesoutputnoiseandimproveloadtransientperformance.Thiscapacitorshouldbelimitedto0.1µF.

TheTPS737xxusesaninternalchargepumptodevelopaninternalsupplyvoltagesufficienttodrivethegateoftheNMOSpasselementaboveVOUT.Thechargepumpgenerates~250µVofswitchingnoiseat~2MHz;however,charge-pumpnoisecontributionisnegligibleattheoutputoftheregulatorformostvaluesofIOUTandCOUT.

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BOARDLAYOUTRECOMMENDATIONTOIMPROVEPSRRANDNOISEPERFORMANCE

ToimproveacperformancesuchasPSRR,outputnoise,andtransientresponse,itisrecommendedthattheprintedcircuitboard(PCB)bedesignedwithseparategroundplanesforVINandVOUT,witheachgroundplaneconnectedonlyattheGNDpinofthedevice.Inaddition,thegroundconnectionforthebypasscapacitorshouldconnectdirectlytotheGNDpinofthedevice.

TRANSIENTRESPONSE

Thelowopen-loopoutputimpedanceprovidedbytheNMOSpasselementinavoltagefollowerconfigurationallowsoperationwithouta1.0µFoutputcapacitor.Aswithanyregulator,theadditionofadditionalcapacitancefromtheoutputpintogroundreducesundershootmagnitudebutincreasesduration.Intheadjustableversion,theadditionofacapacitor,CFB,fromtheoutputtotheadjustpinwillalsoimprovethetransientresponse.

TheTPS737xxdoesnothaveactivepull-downwhentheoutputisover-voltage.Thisarchitectureallowsapplicationsthatconnecthighervoltagesources,suchasalternatepowersupplies,totheoutput.Thisarchitecturealsoresultsinanoutputovershootofseveralpercentiftheloadcurrentquicklydropstozerowhenacapacitorisconnectedtotheoutput.Thedurationofovershootcanbereducedbyaddingaloadresistor.TheovershootdecaysataratedeterminedbyoutputcapacitorCOUTandtheinternal/externalloadresistance.Therateofdecayisgivenby:

(Fixedvoltageversion)

VOUTdV+

dTCOUT 80kWøRLOAD

(Adjustablevoltageversion)

VOUTdV+

dTCOUT 80kWø(R1)R2)øRLOAD

INTERNALCURRENTLIMIT

TheTPS737xxinternalcurrentlimithelpsprotectthe

regulatorduringfaultconditions.Foldbackhelpstoprotecttheregulatorfromdamageduringoutputshort-circuitconditionsbyreducingcurrentlimitwhenVOUTdropsbelow0.5V.

SHUTDOWN

TheEnablepinisactivehighandiscompatiblewithstandardTTL-CMOSlevels.VENbelow0.5V(max)turnstheregulatoroffanddropsthegroundpincurrenttoapproximately10nA.Whenshutdowncapabilityisnotrequired,theEnablepincanbeconnectedtoVIN.Whenapull-upresistorisused,andoperationdownto1.8Visrequired,usepull-upresistorvaluesbelow50kΩ.

(3)

DROPOUTVOLTAGE

TheTPS737xxusesanNMOSpasstransistortoachieveextremelylowdropout.When(VIN–VOUT)islessthanthedropoutvoltage(VDO),theNMOSpassdeviceisinitslinearregionofoperationandtheinput-to-outputresistanceistheRDS,ONoftheNMOSpasselement.

Forlargestepchangesinloadcurrent,theTPS737xxrequiresalargervoltagedropfromVINtoVOUTtoavoiddegradedtransientresponse.Theboundaryofthistransientdropoutregionisapproximatelytwicethedcdropout.ValuesofVIN–VOUTabovethislineensurenormaltransientresponse.

Operatinginthetransientdropoutregioncancauseanincreaseinrecoverytime.Thetimerequiredtorecoverfromaloadtransientisafunctionofthemagnitudeofthechangeinloadcurrentrate,therateofchangeinloadcurrent,andtheavailableheadroom(VINtoVOUTvoltagedrop).Underworst-caseconditions[full-scaleinstantaneousloadchangewith(VIN–VOUT)closetodcdropoutlevels],theTPS737xxcantakeacoupleofhundredmicrosecondstoreturntothespecifiedregulationaccuracy.

(4)

REVERSECURRENT

TheNMOSpasselementoftheTPS737xxprovidesinherentprotectionagainstcurrentflowfromtheoutputoftheregulatortotheinputwhenthegateofthepassdeviceispulledlow.Toensurethatallchargeisremovedfromthegateofthepasselement,theenablepinmustbedrivenlowbeforetheinputvoltageisremoved.Ifthisisnotdone,thepasselementmaybeleftonbecauseofstoredchargeonthegate.

Aftertheenablepinisdrivenlow,nobiasvoltageisneededonanypinforreversecurrentblocking.NotethatreversecurrentisspecifiedasthecurrentflowingoutoftheINpinbecauseofvoltageappliedontheOUTpin.TherewillbeadditionalcurrentflowingintotheOUTpinasaresultofthe80kΩinternalresistordividertoground(seeFigure1andFigure2).

FortheTPS73701,reversecurrentmayflowwhenVFBismorethan1.0VaboveVIN.

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THERMALPROTECTION

Thermalprotectiondisablestheoutputwhenthejunctiontemperaturerisestoapproximately+160°C,allowingthedevicetocool.Whenthejunctiontemperaturecoolstoapproximately+140°C,theoutputcircuitryisagainenabled.Dependingonpowerdissipation,thermalresistance,andambienttemperature,thethermalprotectioncircuitmaycycleonandoff.Thiscyclinglimitsthedissipationoftheregulator,protectingitfromdamageduetooverheating.

Anytendencytoactivatethethermalprotectioncircuitindicatesexcessivepowerdissipationoraninadequateheatsink.Forreliableoperation,junctiontemperatureshouldbelimitedto+125°Cmaximum.Toestimatethemarginofsafetyinacompletedesign(includingheatsink),increasetheambienttemperatureuntilthethermalprotectionistriggered;useworst-caseloadsandsignalconditions.Forgoodreliability,thermalprotectionshouldtriggeratleast+35°Cabovethemaximumexpectedambientconditionofyourapplication.Thisproducesaworst-casejunctiontemperatureof+125°Catthehighestexpectedambienttemperatureandworst-caseload.

TheinternalprotectioncircuitryoftheTPS737xxhasbeendesignedtoprotectagainstoverloadconditions.Itwasnotintendedtoreplaceproperheatsinking.ContinuouslyrunningtheTPS737xxintothermalshutdownwilldegradedevicereliability.

POWERDISSIPATION

Theabilitytoremoveheatfromthedieisdifferentforeachpackagetype,presentingdifferentconsiderationsinthePCBlayout.ThePCBareaaroundthedevicethatisfreeofothercomponentsmovestheheatfromthedevicetotheambientair.PerformancedataforJEDEClow-andhigh-KboardsareshowninthePowerDissipationRatingstable.Usingheaviercopperwillincreasetheeffectivenessinremovingheatfromthedevice.Theadditionofplatedthrough-holestoheat-dissipatinglayerswillalsoimprovetheheatsinkeffectiveness.

Powerdissipationdependsoninputvoltageandloadconditions.Powerdissipation(PD)isequaltotheproductoftheoutputcurrenttimesthevoltagedropacrosstheoutputpasselement(VINtoVOUT):PD+ǒVIN*VOUTǓ IOUT(5)Powerdissipationcanbeminimizedbyusingthelowestpossibleinputvoltagenecessarytoassuretherequiredoutputvoltage.

PackageMounting

SolderpadfootprintrecommendationsfortheTPS737xxarepresentedinApplicationBulletinSolderPadRecommendationsforSurface-MountDevices(SBFA015),availablefromtheTexasInstrumentswebsiteatwww.ti.com.

12

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PACKAGEOPTIONADDENDUM

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12-Sep-2006

PACKAGINGINFORMATION

OrderableDeviceTPS73701DCQTPS73701DCQG4TPS73701DCQRTPS73701DCQRG4

(1)

Status(1)ACTIVEACTIVEACTIVEACTIVE

PackageTypeSOT-223SOT-223SOT-223SOT-223

PackageDrawingDCQDCQDCQDCQ

PinsPackageEcoPlan(2)

Qty6666

7878

Green(RoHS&noSb/Br)Green(RoHS&noSb/Br)

Lead/BallFinishCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAU

MSLPeakTemp(3)Level-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEAR

2500Green(RoHS&

noSb/Br)2500Green(RoHS&

noSb/Br)

Themarketingstatusvaluesaredefinedasfollows:ACTIVE:Productdevicerecommendedfornewdesigns.

LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect.

NRND:Notrecommendedfornewdesigns.Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartinanewdesign.

PREVIEW:Devicehasbeenannouncedbutisnotinproduction.Samplesmayormaynotbeavailable.OBSOLETE:TIhasdiscontinuedtheproductionofthedevice.

(2)

EcoPlan-Theplannedeco-friendlyclassification:Pb-Free(RoHS),Pb-Free(RoHSExempt),orGreen(RoHS&noSb/Br)-pleasecheckhttp://www.ti.com/productcontentforthelatestavailabilityinformationandadditionalproductcontentdetails.TBD:ThePb-Free/Greenconversionplanhasnotbeendefined.

Pb-Free(RoHS):TI'sterms\"Lead-Free\"or\"Pb-Free\"meansemiconductorproductsthatarecompatiblewiththecurrentRoHSrequirementsforall6substances,includingtherequirementthatleadnotexceed0.1%byweightinhomogeneousmaterials.Wheredesignedtobesolderedathightemperatures,TIPb-Freeproductsaresuitableforuseinspecifiedlead-freeprocesses.

Pb-Free(RoHSExempt):ThiscomponenthasaRoHSexemptionforeither1)lead-basedflip-chipsolderbumpsusedbetweenthedieandpackage,or2)lead-baseddieadhesiveusedbetweenthedieandleadframe.ThecomponentisotherwiseconsideredPb-Free(RoHScompatible)asdefinedabove.

Green(RoHS&noSb/Br):TIdefines\"Green\"tomeanPb-Free(RoHScompatible),andfreeofBromine(Br)andAntimony(Sb)basedflameretardants(BrorSbdonotexceed0.1%byweightinhomogeneousmaterial)

(3)

MSL,PeakTemp.--TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature.

ImportantInformationandDisclaimer:TheinformationprovidedonthispagerepresentsTI'sknowledgeandbeliefasofthedatethatitisprovided.TIbasesitsknowledgeandbeliefoninformationprovidedbythirdparties,andmakesnorepresentationorwarrantyastotheaccuracyofsuchinformation.Effortsareunderwaytobetterintegrateinformationfromthirdparties.TIhastakenandcontinuestotakereasonablestepstoproviderepresentativeandaccurateinformationbutmaynothaveconducteddestructivetestingorchemicalanalysisonincomingmaterialsandchemicals.TIandTIsuppliersconsidercertaininformationtobeproprietary,andthusCASnumbersandotherlimitedinformationmaynotbeavailableforrelease.

InnoeventshallTI'sliabilityarisingoutofsuchinformationexceedthetotalpurchasepriceoftheTIpart(s)atissueinthisdocumentsoldbyTItoCustomeronanannualbasis.

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