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TPS79625KTTRG3资料

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TPS796xx

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SLVS351I–SEPTEMBER2002–REVISEDMAY2006

ULTRALOW-NOISE,HIGHPSRR,FAST,RF,1ALOW-DROPOUTLINEARREGULATORS

FEATURES

•••••••••

1ALow-DropoutRegulatorWithEnableAvailableinFixedandAdjustable(1.2Vto5.5V)Versions

HighPSRR(53dBat10kHz)

Ultralow-Noise(40µVRMS,TPS79630)FastStart-UpTime(50µs)

StableWitha1µFCeramicCapacitorExcellentLoad/LineTransientResponseVeryLowDropoutVoltage(250mVatFullLoad,TPS79630)

3×3SON,SOT223-6,andDDPAK-5Packages

DESCRIPTION

TheTPS796xxfamilyoflow-dropout(LDO)low-powerlinearvoltageregulatorsfeatureshighpowersupplyrejectionratio(PSRR),ultralow-noise,faststart-up,andexcellentlineandloadtransientresponsesinsmalloutline,3×3SON,SOT223-6,andDDPAK-5packages.Eachdeviceinthefamilyisstablewithasmall1µFceramiccapacitorontheoutput.Thefamilyusesanadvanced,proprietaryBiCMOSfabricationprocesstoyieldextremelylowdropoutvoltages(e.g.,250mVat1A).Eachdeviceachievesfaststart-uptimes(approximately50µswitha0.001µFbypasscapacitor)whileconsumingverylowquiescentcurrent(265µAtypical).Moreover,whenthedeviceisplacedinstandbymode,thesupplycurrentisreducedtolessthan1µA.TheTPS79630exhibitsapproximately40µVRMSofoutputvoltagenoiseat3.0Voutput,witha0.1µFbypasscapacitor.Applicationswithanalogcomponentsthatarenoisesensitive,suchasportableRFelectronics,benefitfromthehighPSRR,lownoisefeatures,andthefastresponsetime.

APPLICATIONS

•••••

RF:VCOs,Receivers,ADCsAudio

Bluetooth™,WirelessLAN

CellularandCordlessTelephonesHandheldOrganizers,PDAs

DRBPACKAGE3mmx3mmSON(TOPVIEW)

DCQ PACKAGESOT223-6(TOP VIEW)

IN1IN2OUT3OUT48EN7NC6GND5NR

Ripple Rejection − dBTPS79630TPS79630

RIPPLE REJECTION

FREQUENCY

807060504030201001

100

10k100k

10M

Frequency (Hz)

IOUT = 1 mAOutput Spectral Noise Density − µV/√HzVIN = 4 VCOUT = 10 µFCNR = 0.01 µFOUTPUT SPECTRAL NOISE DENSITY

FREQUENCY

0.70.60.50.40.3

IOUT = 1 mA0.20.1

IOUT = 1.5 A0.0100

10k

100k

Frequency (Hz)

VIN = 5.5 VCOUT = 2.2 µFCNR = 0.1 µFENINGNDOUTNR/FB

12345

6GND

KTT (DDPAK) PACKAGE

(TOP VIEW)

IOUT = 1 AENINGNDOUTNR/FB

12345

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

BluetoothisatrademarkofBluetoothSIG,Inc.

Allothertrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.ProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.Productionprocessingdoesnotnecessarilyincludetestingofallparameters.

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TPS796xx

SLVS351I–SEPTEMBER2002–REVISEDMAY2006

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ThisintegratedcircuitcanbedamagedbyESD.TexasInstrumentsrecommendsthatallintegratedcircuitsbehandledwithappropriateprecautions.Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.

ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.Precisionintegratedcircuitsmaybemoresusceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.

ORDERINGINFORMATION(1)

PRODUCTTPS796xxyyyz

VOUT(2)

XXisnominaloutputvoltage(forexample,28=2.8V,01=Adjustable).YYYispackagedesignator.Zispackagequantity.

(1)(2)

Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orseetheTIwebsiteatwww.ti.com.

Outputvoltagesfrom1.3Vto4.9Vin100mVincrementsareavailable;minimumorderquantitiesmayapply.Contactfactoryfordetailsandavailability.

ABSOLUTEMAXIMUMRATINGS

overoperatingtemperaturerange(unlessotherwisenoted)(1)

UNIT

VINrangeVENrangeVOUTrangePeakoutputcurrentESDrating,HBMESDrating,CDM

ContinuoustotalpowerdissipationJunctiontemperaturerange,TJStoragetemperaturerange,Tstg(1)

–0.3Vto6V–0.3VtoVIN+0.3V6V

Internallylimited2kV500V

SeeDissipationRatingsTable–40°Cto+150°C–65°Cto+150°C

Stressesbeyondthoselistedunderabsolutemaximumratingsmaycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderrecommendedoperatingconditionsisnotimplied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.

PACKAGEDISSIPATIONRATINGS

PACKAGEDDPAKSOT2233×3SON

(1)(2)

BOARDHigh-K(1)Low-K(2)High-K(1)

RθJC2°C/W15°C/W1.2°C/W

RθJA23°C/W53°C/W40°C/W

TheJEDEChigh-K(2s2p)boarddesignusedtoderivethisdatawasa3-inch×3-inch(7,5-cm×7,5-cm),multilayerboardwith1-ounceinternalpowerandgroundplanesand2-ouncecoppertracesontopandbottomoftheboard.

TheJEDEClow-K(1s)boarddesignusedtoderivethisdatawasa3-inch×3-inch(7,5-cm×7,5-cm),two-layerboardwith2-ouncecoppertracesontopoftheboard.

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ELECTRICALCHARACTERISTICS

overrecommendedoperatingtemperaturerange(TJ=–40°Cto+125°C),VEN=VIN,,VIN=VOUT(nom)+1V(1),IOUT=1mA,COUT=10µF,andCNR=0.01µF,unlessotherwisenoted.Typicalvaluesareat+25°C.

PARAMETER

VINInputvoltage(1)

VFBInternalreference(TPS79601)IOUTContinuousoutputcurrent

Outputvoltagerange

Outputvoltage

Accuracy

TPS79601TPS79601(2)Fixed

VOUT<5VFixed

VOUT=5V

Outputvoltagelineregulation(∆VOUT%/VIN)(1)

Loadregulation(∆VOUT%/∆IOUT)

TPS79628

Dropoutvoltage(3)

(VIN=VOUT(nom)–0.1V)

TPS79628DRBTPS79630TPS79633TPS79650

OutputcurrentlimitGroundpincurrentShutdowncurrent(4)FBpincurrentPower-supplyripplerejection

0µA≤IOUT≤1A,VOUT+1V≤VIN≤5.5V(1)0µA≤IOUT≤1A,VOUT+1V≤VIN≤5.5V(1)0µA≤IOUT≤1A,VOUT+1V≤VIN≤5.5V(1)VOUT+1V≤VIN≤5.5V0µA≤IOUT≤1AIOUT=1AIOUT=250mAIOUT=1AIOUT=1AIOUT=1AVOUT=0V0µA≤IOUT≤1A

VEN=0V,2.7V≤VIN≤5.5VVFB=1.225V

f=100Hz,IOUT=10mA

TPS79630

f=100Hz,IOUT=1Af=10Hz,IOUT=1Af=100Hz,IOUT=1A

CNR=0.001µF

Outputnoisevoltage(TPS79630)

BW=100Hzto100kHz,IOUT=1A

CNR=0.0047µFCNR=0.01µFCNR=0.1µFCNR=0.001µF

Time,start-up(TPS79630)ENpincurrent

High-levelenableinputvoltageLow-levelenableinputvoltage(1)(2)(3)(4)

RL=3Ω,COUT=1µFVEN=0V2.7V≤VIN≤5.5V2.7V≤VIN≤5.5V

CNR=0.0047µFCNR=0.01µF

–11.70

59545342544641405075110

1VIN0.7

µAVVµsµVRMSdB

2.4

2650.07

TESTCONDITIONS

MIN2.71.200

01.2250.98VOUT

–2.0–3.0

0.05527052250220200

365903453253004.238511

AµAµAµAmV

VOUT1.225TYP

MAX5.51.250

5.5–VDD1.02VOUT

+2.0+3.00.12

UNITVVAVV%%%/VmV

MinimumVIN=VOUT+VDOor2.7V,whicheverisgreater.TPS79650istestedatVIN=5.5V.Toleranceofexternalresistorsnotincludedinthisspecification.

VDOisnotmeasuredforTPS79618andTPS79625becauseminimumVIN=2.7V.

Foradjustableversion,thisappliesonlyafterVINisapplied;thenVENtransitionshightolow.

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FUNCTIONALBLOCKDIAGRAM—ADJUSTABLEVERSION

UVLOCurrentSenseILIMGNDEN

ThermalShutdownBandgapReference1.225 VUVLOR2Quickstart250 kΩVREFExternal tothe Device_SHUTDOWN+FBR1OUTVINFUNCTIONALBLOCKDIAGRAM—FIXEDVERSION

UVLOGNDEN

ThermalShutdownQuickstartBandgapReference1.225 V250 kΩVREFCurrentSenseILIM_UVLOR2R2 = 40kNR

SHUTDOWN+R1OUT

VINTable1.TerminalFunctions

TERMINAL

NAMENRENFBGNDINOUT

ADJN/A153,Tab24

FIXED51N/A3,Tab24

DESCRIPTION

Connectinganexternalcapacitortothispinbypassesnoisegeneratedbytheinternalbandgap.Thisimprovespower-supplyrejectionandreducesoutputnoise.

Drivingtheenablepin(EN)highturnsontheregulator.Drivingthispinlowputstheregulatorintoshutdownmode.ENcanbeconnectedtoINifnotused.

Thisterminalisthefeedbackinputvoltagefortheadjustabledevice.Regulatorground

Unregulatedinputtothedevice.Outputoftheregulator.

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TYPICALCHARACTERISTICS

TPS79630

OUTPUTVOLTAGE

OUTPUTCURRENT

3.053.043.033.023.01VOUT (V)VOUT (V)3.002.992.982.972.962.95

0.0

0.2

0.4

0.6

0.8

1.0

IOUT (A)

02.775−40−25−105203550658095110125TJ (°C)

290

−40−25−105

203550658095110125

TJ (°C)

22.785IOUT = 1 A12.780300

VIN = 4 VCOUT = 10 µFTJ = 25°C2.7954VIN = 3.8 VCOUT = 10 µF32.790IOUT = 1 mA330IGND (µA)320

IOUT = 1 A310

IOUT = 1 mATPS79628

OUTPUTVOLTAGE

JUNCTIONTEMPERATURE350340

TPS79628

GROUNDCURRENT

JUNCTIONTEMPERATURE

VIN = 3.8 VCOUT = 10 µFFigure1.

TPS79630

OUTPUTSPECTRALNOISE

DENSITY

FREQUENCY

0.7

Output Spectral Noise Density − µV//HzOutput Spectral Noise Density − µV//Hz0.60.50.40.3

IOUT = 1 mA0.20.1

IOUT = 1.5 A0.0100

10k

100k

VIN = 5.5 VCOUT = 2.2 µFCNR = 0.1 µF0.6

Figure2.

TPS79630

OUTPUTSPECTRALNOISE

DENSITY

FREQUENCY

2.5Output Spectral Noise Density − µV//HzVIN = 5.5 VCOUT = 10 µFCNR = 0.1 µFFigure3.

TPS79630

OUTPUTSPECTRALNOISE

DENSITY

FREQUENCY

VIN = 5.5 VCOUT = 10 µFIOUT = 1 A0.50.40.30.20.10.0100

IOUT = 1 AIOUT = 1 mA2.0

CNR = 0.01 µF1.5CNR = 0.1 µFCNR = 0.0047 µFCNR = 0.001 µF1.0

0.5

1k10k100k

0.0100

1k10k100k

Frequency (Hz)Frequency (Hz)Frequency (Hz)

Figure4.Figure5.Figure6.

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TYPICALCHARACTERISTICS(continued)

TPS79630

ROOTMEANSQUAREDOUTPUT

NOISEvs

BYPASSCAPACITANCE

RMS − Root Mean Squared Output Noise − µVRMS605040302010

IOUT = 250 mACOUT = 10 µFBW = 100 Hz to 100 kHz0.0047 µF

0.01 µF

0.1 µF

VDO(mV)20015010050IOUT=250mA0−40−25−105203550658095110125TJ(_C)

350300250VIN=2.7VCOUT=10µFIOUT=1ARipple Rejection − dBTPS79628

DROPOUTVOLTAGE

JUNCTIONTEMPERATURE

807060504030201001

TPS79630

RIPPLEREJECTION

FREQUENCY

VIN = 4 VCOUT = 10 µFCNR = 0.01 µFIOUT = 1 mAIOUT = 1 A0

0.001 µF

1001k10k100k1M10M

CNR (µF)Frequency (Hz)

Figure7.TPS79630

RIPPLEREJECTION

FREQUENCY

8070Ripple Rejection − dB60504030201001

100

10k100k

10M

Frequency (Hz)

IOUT = 1 mAVIN = 4 VCOUT = 10 µFCNR = 0.1 µFRipple Rejection − dB807060504030201001

100

Figure8.TPS79630

RIPPLEREJECTION

FREQUENCY

3VIN = 4 VCOUT = 2.2 µFCNR = 0.01 µF2.752.502.252VOUT (V)IOUT = 1 A1.751.501.2510.750.500.2501k

10k100k

10M

Frequency (Hz)

0100200VIN = 4 V,COUT = 10 µF,IOUT = 1.0 ACNR =0.001 µFFigure9.

START-UPTIME

CNR =0.0047 µFEnableIOUT = 1 mAIOUT = 1 ACNR =0.01 µF300t (ms)

400500600Figure10.

TPS79618

LINETRANSIENTRESPONSE

5VIN (V)43240∆VOUT (mV)200−20−40020406080100120140160180200t (µs)

IOUT = 1 ACOUT = 10 µFCNR = 0.01 µFdv1V+msdt654340∆VOUT (mV)200−20−400IOUT = 1 ACOUT = 10 µFCNR = 0.01 µFFigure11.

TPS79630

LINETRANSIENTRESPONSE

2IOUT (A)10−1150∆VOUT (mV)750−75VIN = 3.8 VCOUT = 10 µFCNR = 0.01 µFFigure12.

TPS79628

LOADTRANSIENTRESPONSE

VIN (V)dv1V+msdtdi1A+msdt20406080100120140160180200t (µs)

−15001002003004005006007008009001000t (µs)

Figure13.Figure14.Figure15.

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TYPICALCHARACTERISTICS(continued)

TPS79630

DROPOUTVOLTAGE

OUTPUTCURRENT

350

VOUT = 2.5 VRL = 10 ΩCNR = 0.01 µFTPS79625

POWERUP/POWERDOWN

4.03.53.0500 mV/Div2.52.01.51.00.50012345678910200 µs/Div

VINVOUTTPS79601

DROPOUTVOLTAGE

INPUTVOLTAGE

300250

300250VDO (mV)200150100500

01002003004005006007008009001000

IOUT (mA)

TJ = −40°CTJ = 25°CTJ = 125°CTJ = 125°C200VDO (mV)TJ = 25°C150

TJ = −40°C1005002.5

3.0

3.5

4.0

4.5

5.0

VIN (V)

IOUT = 1 ACOUT = 10 µFCNR = 0.01 µFFigure16.

TPS79630

TYPICALREGIONSOFSTABILITYEQUIVALENTSERIESRESISTANCE

(ESR)vs

OUTPUTCURRENT

100ESR − Equivalent Series Resistance − ΩESR − Equivalent Series Resistance − ΩCOUT = 1 µF10Region ofInstabilityFigure17.

TPS79630

TYPICALREGIONSOFSTABILITYEQUIVALENTSERIESRESISTANCE

(ESR)vs

OUTPUTCURRENT

ESR − Equivalent Series Resistance − ΩFigure18.

TPS79630

TYPICALREGIONSOFSTABILITYEQUIVALENTSERIESRESISTANCE

(ESR)vs

OUTPUTCURRENT

100COUT = 10.0 µF10Region ofInstability100COUT = 2.2 µF10Region ofInstability1Region of Stability0.11Region of Stability0.11Region of Stability0.10.010.0111030601252505007501000IOUT (mA)

0.0111030601252505007501000IOUT (mA)

11030601252505007501000IOUT (mA)

Figure19.Figure20.Figure21.

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APPLICATIONINFORMATION

TheTPS796xxfamilyoflow-dropout(LDO)regulatorshasbeenoptimizedforuseinnoise-sensitiveequipment.Thedevicefeaturesextremelylowdropoutvoltages,highPSRR,ultralowoutputnoise,lowquiescentcurrent(265µAtypically),andenableinputtoreducesupplycurrentstolessthan1µAwhentheregulatoristurnedoff.AtypicalapplicationcircuitisshowninFigure22.

VIN2.2µFINENGNDOUTTPS796xxNR0.01µF1 µFVOUT

Forexample,theTPS79630exhibits40µVRMSofoutputvoltagenoiseusinga0.1µFceramicbypasscapacitoranda10µFceramicoutputcapacitor.NotethattheoutputstartsupslowerasthebypasscapacitanceincreasesduetotheRCtimeconstantatthebypasspinthatiscreatedbytheinternal250kΩresistorandexternalcapacitor.

BoardLayoutRecommendationtoImprovePSRRandNoisePerformance

ToimproveacmeasurementslikePSRR,outputnoise,andtransientresponse,itisrecommendedthattheboardbedesignedwithseparategroundplanesforVINandVOUT,witheachgroundplaneconnectedonlyatthegroundpinofthedevice.Inaddition,thegroundconnectionforthebypasscapacitorshouldconnectdirectlytothegroundpinofthedevice.

Figure22.TypicalApplicationCircuit

ExternalCapacitorRequirements

Althoughnotrequired,itisgoodanalogdesignpracticetoplacea0.1µF—2.2µFcapacitorneartheinputoftheregulatortocounteractreactiveinputsources.A2.2µForlargerceramicinputbypasscapacitor,connectedbetweenINandGNDandlocatedclosetotheTPS796xx,isrequiredforstabilityandimprovestransientresponse,noiserejection,andripplerejection.Ahigher-valueinputcapacitormaybenecessaryiflarge,fast-rise-timeloadtransientsareanticipatedandthedeviceislocatedseveralinchesfromthepowersource.Likemostlowdropoutregulators,theTPS796xxrequiresanoutputcapacitorconnectedbetweenOUTandGNDtostabilizetheinternalcontrolloop.Theminimumrecommendedcapacitoris1µF.Any1µForlargerceramiccapacitorissuitable.

TheinternalvoltagereferenceisakeysourceofnoiseinanLDOregulator.TheTPS796xxhasanNRpinwhichisconnectedtothevoltagereferencethrougha250kΩinternalresistor.The250kΩinternalresistor,inconjunctionwithanexternalbypasscapacitorconnectedtotheNRpin,createsalow-passfiltertoreducethevoltagereferencenoiseand,therefore,thenoiseattheregulatoroutput.Inorderfortheregulatortooperateproperly,thecurrentflowoutoftheNRpinmustbeataminimum,becauseanyleakagecurrentcreatesanIRdropacrosstheinternalresistor,thuscreatinganoutputerror.Therefore,thebypasscapacitormusthaveminimalleakagecurrent.Thebypasscapacitorshouldbenomorethan0.1µFinordertoensurethatitisfullychargedduringthequickstarttimeprovidedbytheinternalswitchshowninthefunctionalblockdiagram.

RegulatorMounting

ThetaboftheSOT223-6packageiselectricallyconnectedtoground.Forbestthermalperformance,thetabofthesurface-mountversionshouldbesoldereddirectlytoacircuit-boardcopperarea.Increasingthecopperareaimprovesheatdissipation.

SolderpadfootprintrecommendationsforthedevicesarepresentedinanapplicationbulletinSolderPadRecommendationsforSurface-MountDevices,literaturenumberAB-132,availablefordownloadfromtheTIwebsite(www.ti.com).

ProgrammingtheTPS79601AdjustableLDORegulator

TheoutputvoltageoftheTPS79601adjustableregulatorisprogrammedusinganexternalresistordividerasshowninFigure28.TheoutputvoltageiscalculatedusingEquation1:VOUT+VREF 1)R1R2(1)

ǒǓwhere:

•VREF=1.2246Vtyp(theinternalreference

voltage)ResistorsR1andR2shouldbechosenforapproximately40µAdividercurrent.Lowervalueresistorscanbeusedforimprovednoiseperformance,butthedevicewastesmorepower.Highervaluesshouldbeavoided,asleakagecurrentatFBincreasestheoutputvoltageerror.

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TherecommendeddesignprocedureistochooseR2=30.1kΩtosetthedividercurrentat40µA,C1=15pFforstability,andthencalculateR1usingEquation2:

R1+

RegulatorProtection

TheTPS796xxPMOS-passtransistorhasabuilt-inbackdiodethatconductsreversecurrentwhentheinputvoltagedropsbelowtheoutputvoltage(e.g.,duringpower-down).Currentisconductedfromtheoutputtotheinputandisnotinternallylimited.Ifextendedreversevoltageoperationisanticipated,externallimitingmightbeappropriate.

TheTPS796xxfeaturesinternalcurrentlimitingandthermalprotection.Duringnormaloperation,theTPS796xxlimitsoutputcurrenttoapproximately2.8A.Whencurrentlimitingengages,theoutputvoltagescalesbacklinearlyuntiltheovercurrentconditionends.Whilecurrentlimitingisdesignedtopreventgrossdevicefailure,careshouldbetakennottoexceedthepowerdissipationratingsofthepackage.Ifthetemperatureofthedeviceexceedsapproximately+165°C,thermal-protectioncircuitryshutsitdown.Oncethedevicehascooleddowntobelowapproximately+140°C,regulatoroperationresumes.

VOUT

ǒVV

OUTREF

*1 R2

(2)

Inordertoimprovethestabilityoftheadjustableversion,itissuggestedthatasmallcompensationcapacitorbeplacedbetweenOUTandFB.TheapproximatevalueofthiscapacitorcanbecalculatedasEquation3:

(3x10–7)x(R1)R2)

C1+

(R1xR2)(3)Thesuggestedvalueofthiscapacitorforseveral

resistorratiosisshowninthetablebelow(seeFigure23).Ifthiscapacitorisnotused(suchasinaunity-gainconfiguration)thentheminimumrecommendedoutputcapacitoris2.2µFinsteadof1µF.

VIN2.2 µFINENOUTTPS79601GNDFBOUTPUT VOLTAGEPROGRAMMING GUIDE

OUTPUTVOLTAGE

1.8 V3.6V

R114.0 kΩ57.9 kΩ

R230.1 kΩ30.1 kΩ

C133 pF15 pF

R1C11 µFR2Figure23.TPS79601AdjustableLDORegulatorProgramming

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THERMALINFORMATION

TheamountofheatthatanLDOlinearregulatorgeneratesisdirectlyproportionaltotheamountofpoweritdissipatesduringoperation.Allintegratedcircuitshaveamaximumallowablejunctiontemperature(TJmax)abovewhichnormaloperationisnotassured.Asystemdesignermustdesigntheoperatingenvironmentsothattheoperatingjunctiontemperature(TJ)doesnotexceedthemaximumjunctiontemperature(TJmax).Thetwomainenvironmentalvariablesthatadesignercanusetoimprovethermalperformanceareairflowandexternalheatsinks.Thepurposeofthisinformationistoaidthedesignerindeterminingtheproperoperatingenvironmentforalinearregulatorthatisoperatingataspecificpowerlevel.

Ingeneral,themaximumexpectedpower(PD(max))consumedbyalinearregulatoriscomputedasEquation4:

PDmax+ǒVIN(avg)*VOUT(avg)Ǔ IOUT(avg))VIN(avg) I(Q)

(4)

dissipation.Thetemperatureriseiscomputedbymultiplyingthemaximumexpectedpowerdissipationbythesumofthethermalresistancesbetweenthejunctionandthecase(RθJC),thecasetoheatsink(RθCS),andtheheatsinktoambient(RθSA).Thermalresistancesaremeasuresofhoweffectivelyanobjectdissipatesheat.Typically,thelargerthedevice,themoresurfaceareaavailableforpowerdissipationandthelowertheobject'sthermalresistance.

Figure24illustratesthesethermalresistancesfor(a)aSOT223packagemountedinaJEDEClow-Kboard,and(b)aDDPAKpackagemountedonaJEDEChigh-Kboard.

Equation5summarizesthecomputation:

+T)PDmaxxR)R)R

AθJCθCSθSA

(5)

where:

•VIN(avg)istheaverageinputvoltage.•VOUT(avg)istheaverageoutputvoltage.•IOUT(avg)istheaverageoutputcurrent.•I(Q)isthequiescentcurrent.

FormostTILDOregulators,thequiescentcurrentisinsignificantcomparedtotheaverageoutputcurrent;therefore,thetermVIN(avg)×I(Q)canbeneglected.Theoperatingjunctiontemperatureiscomputedbyaddingtheambienttemperature(TA)andtheincreaseintemperatureduetotheregulator'spower

CIRCUIT BOARD COPPER AREA

BRθCS

CRθSARθJC

TheRθJCisspecifictoeachregulatorasdeterminedbyitspackage,leadframe,anddiesizeprovidedintheregulator'sdatasheet.TheRθSAisafunctionofthetypeandsizeofheatsink.Forexample,blackbodyradiatortypeheatsinkscanhaveRθCSvaluesrangingfrom5°C/Wforverylargeheatsinksto50°C/Wforverysmallheatsinks.TheRθCSisafunctionofhowthepackageisattachedtotheheatsink.Forexample,ifathermalcompoundisusedtoattachaheatsinktoaSOT223package,RθCSof1°C/Wisreasonable.

ABTC

SOT223 Package

(a)

DDPAK Package

(b)

CFigure24.ThermalResistances

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SLVS351I–SEPTEMBER2002–REVISEDMAY2006

RθJA− Thermal Resistance − °C/WEvenifnoexternalblackbodyradiatortypeheatsinkisattachedtothepackage,theboardonwhichtheregulatorismountedprovidessomeheatsinkingthroughthepinsolderconnections.Somepackages,liketheDDPAKandSOT223packages,useacopperplaneunderneaththepackageorthecircuitboard'sgroundplaneforadditionalheatsinkingtoimprovetheirthermalperformance.Computer-aidedthermalmodelingcanbeusedtocomputeveryaccurateapproximationsofanintegratedcircuit'sthermalperformanceindifferentoperatingenvironments(e.g.,differenttypesofcircuitboards,differenttypesandsizesofheatsinks,anddifferentairflows,etc.).Usingthesemodels,thethreethermalresistancescanbecombinedintoonethermalresistancebetweenjunctionandambient(RθJA).ThisRθJAisvalidonlyforthespecificoperatingenvironmentusedinthecomputermodel.Equation5simplifiesintoEquation6:T+T)PDmaxxRJAθJARearrangingEquation6givesEquation7:

TJ–TA

R+θJAPmax

θJA

max+(125*55)°Cń2.5W+28°CńW

(9)

FromFigure25,DDPAKThermalResistancevs

CopperHeatsinkArea,thegroundplaneneedstobe1cm2fortheparttodissipate2.5W.TheoperatingenvironmentusedinthecomputermodeltoconstructFigure25consistedofastandardJEDECHigh-Kboard(2S2P)witha1-oz.internalcopperplaneandgroundplane.Thepackageissolderedtoa2-oz.copperpad.Thepadistiedthroughthermalviastothe1-oz.groundplane.Figure26showsthesideviewoftheoperatingenvironmentusedinthecomputermodel.

40No Air Flow35150 LFM30(6)

250 LFM25(7)

UsingEquation6andthecomputermodelgeneratedcurvesshowninFigure25andFigure28,adesignercanquicklycomputetherequiredheatsinkthermalresistance/boardareaforagivenambienttemperature,powerdissipation,andoperatingenvironment.

20150.1110Copper Heatsink Area − cm2

100DDPAKPowerDissipation

TheDDPAKpackageprovidesaneffectivemeansofmanagingpowerdissipationinsurfacemountapplications.TheDDPAKpackagedimensionsareprovidedintheMechanicalDatasectionattheendofthedatasheet.TheadditionofacopperplanedirectlyunderneaththeDDPAKpackageenhancesthethermalperformanceofthepackage.

Toillustrate,theTPS72525inaDDPAKpackagewaschosen.Forthisexample,theaverageinputvoltageis5V,theoutputvoltageis2.5V,theaverageoutputcurrentis1A,theambienttemperature55°C,theairflowis150LFM,andtheoperatingenvironmentisthesameasdocumentedbelow.Neglectingthequiescentcurrent,themaximumaveragepoweriscalculatedasEquation8:PDmax+(5*2.5)Vx1A+2.5W(8)SubstitutingTJmaxforTJintoEquation6givesEquation9:

Figure25.DDPAKThermalResistancevsCopper

HeatsinkArea

2 oz. Copper Solder Padwith 25 Thermal Vias1 oz. CopperPower Plane1 oz. CopperGround PlaneThermal Vias, 0.3 mmDiameter, 1,5 mm Pitch

Figure26.DDPAKThermalResistanceFromthedatainFigure27andrearrangingEquation6,themaximumpowerdissipationforadifferentgroundplaneareaandaspecificambienttemperaturecanbecomputed.

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TPS796xx

SLVS351I–SEPTEMBER2002–REVISEDMAY2006

www.ti.com

5TA = 55°CRθJA− Thermal Resistance − °C/W18016014012010080604020No Air Flow4250 LFMPD Maximum (W)150 LFM3No Air Flow210.1110Copper Heatsink Area − cm2

10000.11PCB Copper Area − in2

10Figure27.MaximumPowerDissipationvs

CopperHeatsinkArea

Figure28.SOT223ThermalResistancevsPCB

AreaFromthedatainFigure28andrearrangingEquation6,themaximumpowerdissipationforadifferentgroundplaneareaandaspecificambienttemperaturecanbecomputed(seeFigure29).

6TA = 25°C5SOT223PowerDissipation

TheSOT223packageprovidesaneffectivemeansofmanagingpowerdissipationinsurfacemountapplications.TheSOT223packagedimensionsareprovidedintheMechanicalDatasectionattheendofthedatasheet.TheadditionofacopperplanedirectlyunderneaththeSOT223packageenhancesthethermalperformanceofthepackage.

Toillustrate,theTPS72525inaSOT223packagewaschosen.Forthisexample,theaverageinputvoltageis3.3V,theoutputvoltageis2.5V,theaverageoutputcurrentis1A,theambienttemperature55°C,noairflowispresent,andtheoperatingenvironmentisthesameasdocumentedbelow.Neglectingthequiescentcurrent,themaximumaveragepoweriscalculatedasEquation10:

PDmax+(3.3*2.5)Vx1A+800mW(10)SubstitutingTJmaxforTJintoEquation6givesEquation11:Rmax+(125*55)°Cń800mW+87.5°CńWθJA

4PD Maximum (W)4 in2 PCB Area30.5 in2 PCB Area2100255075TA (°C)

100125150(11)

FromFigure28,RθJAvsPCBCopperArea,thegroundplaneneedstobe0.55in2fortheparttodissipate800mW.TheoperatingenvironmentusedtoconstructFigure28consistedofaboardwith1-oz.copperplanes.Thepackageissolderedtoa1-oz.copperpadonthetopoftheboard.Thepadistiedthroughthermalviastothe1-oz.groundplane.

Figure29.SOT223PowerDissipation

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improvements,andotherchangestoitsproductsandservicesatanytimeandtodiscontinueanyproductorservicewithoutnotice.Customersshouldobtainthelatestrelevantinformationbeforeplacingordersandshouldverifythatsuchinformationiscurrentandcomplete.AllproductsaresoldsubjecttoTI’stermsandconditionsofsalesuppliedatthetimeoforderacknowledgment.TIwarrantsperformanceofitshardwareproductstothespecificationsapplicableatthetimeofsaleinaccordancewithTI’sstandardwarranty.TestingandotherqualitycontroltechniquesareusedtotheextentTIdeemsnecessarytosupportthiswarranty.Exceptwheremandatedbygovernmentrequirements,testingofallparametersofeachproductisnotnecessarilyperformed.

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PACKAGEOPTIONADDENDUM

www.ti.com

16-Mar-2007

PACKAGINGINFORMATION

OrderableDeviceTPS79601DCQTPS79601DCQG4TPS79601DCQRTPS79601DCQRG4TPS79601KTTTPS79601KTTRTPS79601KTTRG3TPS79601KTTTTPS79601KTTTG3TPS79613DRBRTPS79613DRBTTPS79618DCQTPS79618DCQG4TPS79618DCQRTPS79618DCQRG4TPS79618KTTTPS79618KTTRTPS79618KTTRG3TPS79618KTTTTPS79618KTTTG3TPS79625DCQTPS79625DCQG4TPS79625DCQRTPS79625DCQRG4TPS79625KTTTPS79625KTTR

Status(1)ACTIVEACTIVEACTIVEACTIVEOBSOLETEACTIVEACTIVEACTIVEACTIVEPREVIEWPREVIEWACTIVEACTIVEACTIVEACTIVEOBSOLETEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEOBSOLETEACTIVE

PackageTypeSOT-223SOT-223SOT-223SOT-223DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263SONSONSOT-223SOT-223SOT-223SOT-223DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263SOT-223SOT-223SOT-223SOT-223DDPAK/TO-263DDPAK/

PackageDrawingDCQDCQDCQDCQKTTKTTKTTKTTKTTDRBDRBDCQDCQDCQDCQKTTKTTKTTKTTKTTDCQDCQDCQDCQKTTKTT

PinsPackageEcoPlan(2)

Qty66665555588666655555666655

50050050050507878787850050050507878

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

Lead/BallFinishCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCallTICUSNCUSNCUSNCUSNCallTICallTICUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCallTICUSNCUSNCUSNCUSNCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCallTICUSN

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

Level-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARCallTICallTI

Level-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARCallTI

Level-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARCallTI

Level-2-260C-1YEAR

2500Green(RoHS&

noSb/Br)2500Green(RoHS&

noSb/Br)

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

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

2500Green(RoHS&

noSb/Br)2500Green(RoHS&

noSb/Br)

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

2500Green(RoHS&

noSb/Br)2500Green(RoHS&

noSb/Br)

TBDGreen(RoHS&

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PACKAGEOPTIONADDENDUM

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16-Mar-2007

OrderableDevice

Status(1)

PackageTypeTO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263SOT-223SOT-223SOT-223SOT-223SONSONSONSONDDPAK/TO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263SOT-223SOT-223SOT-223SOT-223DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263

PackageDrawingKTTKTTKTTDCQDCQDCQDCQDRBDRBDRBDRBKTTKTTKTTKTTKTTDCQDCQDCQDCQKTTKTTKTTKTTKTT

PinsPackageEcoPlan(2)

Qty

noSb/Br)

5556666888855555666655555

50050050505005005050787850050507878

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

Lead/BallFinish

MSLPeakTemp(3)

TPS79625KTTRG3TPS79625KTTTTPS79625KTTTG3TPS79628DCQTPS79628DCQG4TPS79628DCQRTPS79628DCQRG4TPS79628DRBRTPS79628DRBRG4TPS79628DRBTTPS79628DRBTG4TPS79628KTTTPS79628KTTRTPS79628KTTRG3TPS79628KTTTTPS79628KTTTG3TPS79630DCQTPS79630DCQG4TPS79630DCQRTPS79630DCQRG4TPS79630KTTTPS79630KTTRTPS79630KTTRG3TPS79630KTTTTPS79630KTTTG3

ACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEOBSOLETEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEOBSOLETEACTIVEACTIVEACTIVEACTIVE

CUSNCUSNCUSNCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCallTICUSNCUSNCUSNCUSNCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCallTICUSNCUSNCUSNCUSN

Level-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARCallTI

Level-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARCallTI

Level-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEARLevel-2-260C-1YEAR

2500Green(RoHS&

noSb/Br)2500Green(RoHS&

noSb/Br)3000Green(RoHS&

noSb/Br)250250

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

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

2500Green(RoHS&

noSb/Br)2500Green(RoHS&

noSb/Br)

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

Addendum-Page2

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PACKAGEOPTIONADDENDUM

www.ti.com

16-Mar-2007

OrderableDeviceTPS79633DCQTPS79633DCQG4TPS79633DCQRTPS79633DCQRG4TPS79633KTTTPS79633KTTRTPS79633KTTRG3TPS79633KTTTTPS79633KTTTG3TPS79650DCQTPS79650DCQG4TPS79650DCQRTPS79650DCQRG4TPS79650DRBRTPS79650DRBRG4TPS79650DRBTTPS79650DRBTG4

(1)

Status(1)ACTIVEACTIVEACTIVEACTIVEOBSOLETEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVE

PackageTypeSOT-223SOT-223SOT-223SOT-223DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263DDPAK/TO-263SOT-223SOT-223SOT-223SOT-223SONSONSONSON

PackageDrawingDCQDCQDCQDCQKTTKTTKTTKTTKTTDCQDCQDCQDCQDRBDRBDRBDRB

PinsPackageEcoPlan(2)

Qty66665555566668888

500500505078787878

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

Lead/BallFinishCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCallTICUSNCUSNCUSNCUSNCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAU

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

2500Green(RoHS&

noSb/Br)2500Green(RoHS&

noSb/Br)

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

2500Green(RoHS&

noSb/Br)2500Green(RoHS&

noSb/Br)3000Green(RoHS&

noSb/Br)250250

Green(RoHS&noSb/Br)Green(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)

Addendum-Page3

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PACKAGEOPTIONADDENDUM

www.ti.com

16-Mar-2007

(3)

MSL,PeakTemp.--TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature.

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

InnoeventshallTI'sliabilityarisingoutofsuchinformationexceedthetotalpurchasepriceoftheTIpart(s)atissueinthisdocumentsoldbyTItoCustomeronanannualbasis.

Addendum-Page4

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PACKAGEMATERIALSINFORMATION

www.ti.com

15-May-2007

TAPEANDREELINFORMATION

PackMaterials-Page1

元器件交易网www.cecb2b.com

PACKAGEMATERIALSINFORMATION

www.ti.com

15-May-2007

DevicePackagePinsSite

ReelDiameter(mm)330330330330330180330330330330180

ReelWidth(mm)888812128881212

A0(mm)B0(mm)K0(mm)

P1(mm)88888888888

WPin1(mm)Quadrant1212121212121212121212

Q3Q3Q3Q3Q2Q2Q3Q3Q3Q2Q2

TPS79601DCQRTPS79618DCQRTPS79625DCQRTPS79628DCQRTPS79628DRBRTPS79628DRBTTPS79630DCQRTPS79633DCQRTPS79650DCQRTPS79650DRBRTPS79650DRBT

DCQDCQDCQDCQDRBDRBDCQDCQDCQDRBDRB

66668866688

HNTHNTHNTHNTMLAMLAHNTHNTHNTMLAMLA

6.86.86.86.83.33.36.86.86.83.33.3

7.37.37.37.33.33.37.37.37.33.33.3

1.881.881.881.881.11.11.881.881.881.11.1

TAPEANDREELBOXINFORMATION

DeviceTPS79601DCQRTPS79618DCQRTPS79625DCQRTPS79628DCQRTPS79628DRBRTPS79628DRBTTPS79630DCQRTPS79633DCQRTPS79650DCQRTPS79650DRBR

PackageDCQDCQDCQDCQDRBDRBDCQDCQDCQDRB

Pins6666886668

SiteHNTHNTHNTHNTMLAMLAHNTHNTHNTMLA

Length(mm)

358.0358.0358.0358.0346.0190.0358.0358.0358.0346.0

Width(mm)335.0335.0335.0335.0346.0212.7335.0335.0335.0346.0

Height(mm)

35.035.035.035.029.031.7535.035.035.029.0

PackMaterials-Page2

元器件交易网www.cecb2b.com

PACKAGEMATERIALSINFORMATION

www.ti.com

15-May-2007

DeviceTPS79650DRBT

PackageDRB

Pins8

SiteMLA

Length(mm)

190.0

Width(mm)212.7

Height(mm)

31.75

PackMaterials-Page3

元器件交易网www.cecb2b.com

IMPORTANTNOTICE

TexasInstrumentsIncorporatedanditssubsidiaries(TI)reservetherighttomakecorrections,modifications,enhancements,

amplifier.ti.comdataconverter.ti.comdsp.ti.cominterface.ti.comlogic.ti.compower.ti.commicrocontroller.ti.comwww.ti-rfid.comwww.ti.com/lpwApplicationsAudioAutomotiveBroadbandDigitalControlMilitary

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