LP2950-50LPRE3资料

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LP2950,LP2951

ADJUSTABLEMICROPOWERVOLTAGEREGULATORS

WITHSHUTDOWN

SLVS582D–APRIL2006–REVISEDMARCH2007

FEATURES

•••••••

WideInputRange…upto30VRatedOutputCurrentof100mA

LowDropout…380mV(Typ)at100mALowQuiescentCurrent…75µA(Typ)TightLineRegulation…0.03%(Typ)TightLoadRegulation…0.04%(Typ)HighVOAccuracy–1.4%at25°C

–2%OverTemperature

CanBeUsedasaRegulatororReference

•••

StableWithLowESR(>12mΩ)CapacitorsCurrent-andThermal-LimitingFeaturesLP2950Only(3-PinPackage)

–Fixed-OutputVoltagesof5V,3.3V,

and3V

LP2951Only(8-PinPackage)

–Fixed-orAdjustable-OutputVoltages:

5V/ADJ,3.3V/ADJ,and3V/ADJ

–Low-VoltageErrorSignalonFallingOutput–ShutdownCapability

–RemoteSenseCapabilityforOptimal

OutputRegulationandAccuracy

LP2951...D (SOIC) PACKAGE

(TOPVIEW)

•

•

LP2950...LP (TO-226/TO-92 PACKAGE

(BOTTOMVIEW)

OUTPUTGNDINPUT

OUTPUTSENSESHUTDOWN

GND

1234

8765

INPUT

FEEDBACKVTAPERRORDESCRIPTION/ORDERINGINFORMATION

TheLP2950andLP2951devicesarebipolar,low-dropoutvoltageregulatorsthatcanaccommodateawideinputsupply-voltagerangeofupto30V.Theeasy-to-use,3-pinLP2950isavailableinfixed-outputvoltagesof5V,3.3V,and3V.However,the8-pinLP2951isabletooutputeitherafixedoradjustableoutputfromthesamedevice.BytyingtheOUTPUTandSENSEpinstogether,andtheFEEDBACKandVTAPpinstogether,theLP2951outputsafixed5V,3.3V,or3V(dependingontheversion).Alternatively,byleavingtheSENSEandVTAPpinsopenandconnectingFEEDBACKtoanexternalresistordivider,theoutputcanbesettoanyvaluebetween1.235Vto30V.

The8-pinLP2951alsooffersadditionalfunctionalitythatmakesitparticularlysuitableforbattery-poweredapplications.Forexample,alogic-compatibleshutdownfeatureallowstheregulatortobeputinstandbymodeforpowersavings.Inaddition,thereisabuilt-insupervisorresetfunctioninwhichtheERRORoutputgoeslowwhenVOUTdropsby6%ofitsnominalvalueforwhateverreasons–duetoadropinVIN,currentlimiting,orthermalshutdown.

TheLP2950andLP2951aredesignedtominimizeallerrorcontributionstotheoutputvoltage.Withatightoutputtolerance(0.5%at25°C),averylowoutputvoltagetemperaturecoefficient(20ppmtypical),extremelygoodlineandloadregulation(0.3%and0.4%typical),andremotesensingcapability,thepartscanbeusedaseitherlow-powervoltagereferencesor100-mAregulators.

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.ProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.Productionprocessingdoesnotnecessarilyincludetestingofallparameters.

Copyright©2006–2007,TexasInstrumentsIncorporated

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ADJUSTABLEMICROPOWERVOLTAGEREGULATORSWITHSHUTDOWN

SLVS582D–APRIL2006–REVISEDMARCH2007

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ORDERINGINFORMATION(1)

TA

VOUT(NOM)

PACKAGE(2)

TO-226/TO-92–LP

3V

SOIC–D

TO-226/TO-92–LP

3.3V

–40°Cto125°C

SOIC–D

TO-226/TO-92–LP

5V

SOIC–D

ADJ

(1)(2)

SOIC-D

Bulkof1000Reelof2000Tubeof75Reelof2500Bulkof1000Reelof2000Tubeof75Reelof2500Bulkof1000Reelof2000Tubeof75Reelof2500Tubeof75Reelof2500

ORDERABLEPARTNUMBERLP2950-30LPLP2950-30LPRLP2951-30DLP2951-30DRLP2950-33LPLP2950-33LPRLP2951-33DLP2951-33DRLP2950-50LPLP2950-50LPRLP2951-50DLP2951-50DRLP2951DLP2951DR

TOP-SIDEMARKINGKY5030KY5130KY5033KY5133PREVIEWKY5050KY5150KY5150

Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orseetheTIwebsiteatwww.ti.com.

Packagedrawings,standardpackingquantities,thermaldata,symbolization,andPCBdesignguidelinesareavailableatwww.ti.com/sc/package.

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ADJUSTABLEMICROPOWERVOLTAGEREGULATORS

WITHSHUTDOWN

SLVS582D–APRIL2006–REVISEDMARCH2007

LP2950FUNCTIONALBLOCKDIAGRAM

Unregulated DC+INPUTOUTPUT+−VOUTIL 3 100 mA+ERRORAmplifierSee Application Information+1.23-VReferenceGNDLP2951FUNCTIONALBLOCKDIAGRAM

Unregulated DC+VOUTIL 3 100 mA8INPUT1OUTPUT7FEEDBACK2SENSE+−3FromCMOSor TTLSHUTDOWNERRORAmplifier6VTAP330 kW5+See Application InformationSee Application InformationTo CMOSor TTL++60 mV−+ERROR1.235-VReferenceGND4ERROR Detection ComparatorSubmitDocumentationFeedback

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AbsoluteMaximumRatings(1)

overoperatingfree-airtemperaturerange(unlessotherwisenoted)

MIN

VINVSHDNVFDBKθJATJTstg(1)(2)(3)(4)(5)

ContinuousinputvoltagerangeSHUTDOWNinputvoltagerange

ERRORcomparatoroutputvoltagerange(2)FEEDBACKinputvoltagerange(2)(3)Packagethermalimpedance(4)(5)OperatingvirtualjunctiontemperatureStoragetemperaturerange

–65

DpackageLPpackage

–0.3–1.5–1.5–1.5

MAX3030303097140150150

UNITVVVV°C/W°C°C

Stressesbeyondthoselistedunder\"absolutemaximumratings\"maycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunder\"recommendedoperatingconditions\"isnotimplied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.Mayexceedinputsupplyvoltage

Ifloadisreturnedtoanegativepowersupply,theoutputmustbediodeclampedtoGND.

MaximumpowerdissipationisafunctionofTJ(max),θJA,andTA.ThemaximumallowablepowerdissipationatanyallowableambienttemperatureisPD=(TJ(max)–TA)/θJA.OperatingattheabsolutemaximumTJof150°Ccanaffectreliability.ThepackagethermalimpedanceiscalculatedinaccordancewithJESD51-7.

RecommendedOperatingConditions

MIN

VINTJ(1)

Supplyinputvoltage

Operatingvirtualjunctiontemperature

MinimumVINisthegreaterof:

a.2V(25°C),2.3V(overtemperature),orb.VOUT(MAX)+Dropout(Max)atratedIL

(1)

MAX30125

UNITV°C

–40

4

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ADJUSTABLEMICROPOWERVOLTAGEREGULATORS

WITHSHUTDOWN

SLVS582D–APRIL2006–REVISEDMARCH2007

ElectricalCharacteristics

VIN=VOUT(nominal)+1V,IL=100µA,CL=1µF(5-Vversions)orCL=2.2µF(3-Vand3.3-Vversions),8-pinversion:FEEDBACKtiedtoVTAP,OUTPUTtiedtoSENSE,VSHUTDOWN≤0.7V

PARAMETER

3-VVERSION(LP295x-30)VOUT

Outputvoltage

IL=100µA

25°C–40°Cto125°C

25°C–40°Cto125°C

25°C–40°Cto125°C

2.9702.9403.2673.2344.9504.900

333.33.355

3.0303.0603.3333.3665.0505.100

V

TESTCONDITIONS

TJ

MIN

TYP

MAX

UNIT

3.3-VVERSION(LP295x-33)VOUT

Outputvoltage

IL=100µA

V

5-VVERSION(LP295x-50)VOUT

Outputvoltage

IL=100µA

V

ALLVOLTAGEOPTIONS

Outputvoltagetemperaturecoefficient(1)Lineregulation(2)Loadregulation(2)

IL=100µA

VIN=[VOUT(NOM)+1V]to30VIL=100µAto100mAIL=100µA

VIN–VOUTDropoutvoltage(3)

IL=100mAIL=100µA

IGND

GNDcurrent

IL=100mA

DropoutgroundcurrentCurrentlimitThermalregulation(4)

VIN=VOUT(NOM)–0.5V,IL=100µAVOUT=0VIL=100µACL=1µF(5Vonly)

Outputnoise(RMS),10Hzto100kHz

CL=200µF

LP2951-50:CL=3.3µF,

CBypass=0.01µFbetweenpins1and7

25°C

100

–40°Cto125°C

25°C–40°Cto125°C

25°C–40°Cto125°C

25°C–40°Cto125°C

25°C–40°Cto125°C

25°C–40°Cto125°C

25°C–40°Cto125°C

25°C–40°Cto125°C

25°C–40°Cto125°C

25°C

0.05430160

µV

160110875380500.04200.03

100ppm/°C0.20.40.20.38015045060012014012141702002002200.2

µAmAµAmA%/WmV%/V%

(LP2951-xx)8-PINVERSIONONLYADJ

25°C–40°Cto125°C

Referencevoltage

VOUT=VREFto(VIN–1V),VIN=2.3Vto30V,IL=100µAto100mA

–40°Cto125°C

25°C

1.2181.2121.200

201.235

1.2521.257

V

1.272

ppm/°C

Referencevoltage

temperaturecoefficient(1)

(1)(2)(3)(4)

Outputorreferencevoltagetemperaturecoefficientisdefinedastheworst-casevoltagechangedividedbythetotaltemperaturerange.Regulationismeasuredatconstantjunctiontemperature,usingpulsetestingwithalowdutycycle.Changesinoutputvoltageduetoheatingeffectsarecoveredunderthespecificationforthermalregulation.

Dropoutvoltageisdefinedastheinput-to-outputdifferentialatwhichtheoutputvoltagedrops100mV,belowthevaluemeasuredat1-Vdifferential.Theminimuminputsupplyvoltageof2V(2.3Vovertemperature)mustbeobserved.

Thermalregulationisdefinedasthechangeinoutputvoltageatatime(T)afterachangeinpowerdissipationisapplied,excludingloadorlineregulationeffects.Specificationsarefora50-mAloadpulseatVIN=30V,VOUT=5V(1.25-Wpulse)fort=10ms.

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ElectricalCharacteristics(continued)

VIN=VOUT(nominal)+1V,IL=100µA,CL=1µF(5-Vversions)orCL=2.2µF(3-Vand3.3-Vversions),8-pinversion:FEEDBACKtiedtoVTAP,OUTPUTtiedtoSENSE,VSHUTDOWN≤0.7V

PARAMETERFEEDBACKbiascurrentFEEDBACKbiascurrenttemperaturecoefficient

ERRORCOMPARATOR

OutputleakagecurrentOutputlowvoltageUpperthresholdvoltage(ERRORoutputhigh)(5)Lowerthresholdvoltage(ERRORoutputlow)(5)Hysteresis(6)

SHUTDOWNINPUT

Inputlogicvoltage

Low(regulatorON)High(regulatorOFF)VTAP=2.4V

SHUTDOWNinputcurrent

VTAP=30V

Regulatoroutputcurrentinshutdown

(5)

VSHUTDOWN≥2V,VIN≤30V,VOUT=0,FEEDBACKtiedtoVTAP

–40°Cto125°C

25°C–40°Cto125°C

25°C–40°Cto125°C

25°C–40°Cto125°C

3450

0.7

2

30

501006007501020

µAµAV

VOUT=30V

VIN=VOUT(NOM)–0.5V,IOL=400µA

25°C–40°Cto125°C

25°C–40°Cto125°C

25°C–40°Cto125°C

25°C–40°Cto125°C

25°C

15

4025

75

95140

601500.01

12250400

µAmVmVmVmV

TESTCONDITIONS

TJ25°C–40°Cto125°C

25°C

0.1

MIN

TYP20

MAX4060

UNITnAnA/°C

(6)

Comparatorthresholdsareexpressedintermsofavoltagedifferentialequaltothenominalreferencevoltage(measuredat

VIN–VOUT=1V)minusFEEDBACKterminalvoltage.Toexpressthesethresholdsintermsofoutputvoltagechange,multiplybytheerroramplifiergain=VOUT/VREF=(R1+R2)/R2.Forexample,ataprogrammedoutputvoltageof5V,theERRORoutputisspecifiedtogolowwhentheoutputdropsby95mV×5V/1.235V=384mV.ThresholdsremainconstantasapercentageofVOUT(asVOUTisvaried),withthelow-outputwarningoccurringat6%belownominal(typ)and7.7%(max).

Comparatorthresholdsareexpressedintermsofavoltagedifferentialequaltothenominalreferencevoltage(measuredat

VIN–VOUT=1V)minusFEEDBACKterminalvoltage.Toexpressthesethresholdsintermsofoutputvoltagechange,multiplybytheerroramplifiergain=VOUT/VREF=(R1+R2)/R2.Forexample,ataprogrammedoutputvoltageof5V,theERRORoutputisspecifiedtogolowwhentheoutputdropsby95mV×5V/1.235V=384mV.ThresholdsremainconstantasapercentageofVOUT(asVOUTisvaried),withthelow-outputwarningoccurringat6%belownominal(typ)and7.7%(max).

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LP2950,LP2951

ADJUSTABLEMICROPOWERVOLTAGEREGULATORS

WITHSHUTDOWN

SLVS582D–APRIL2006–REVISEDMARCH2007

TYPICALCHARACTERISTICS

QUIESCENTCURRENT

vs

LOADCURRENT

10

10090

INPUTCURRENT

vs

INPUTVOLTAGE

RL=∞QuiescentCurrent–mA80InputCurrent–µA1

706050403020

0.1

0.01

0.0001

10

0.0010.010.1

0012345678910VIN–InputVoltage–V

IL–LoadCurrent–A

INPUTCURRENT

vs

INPUTVOLTAGE

200180160

12011010090InputCurrent–mA8070605040302010

INPUTCURRENT

vs

INPUTVOLTAGE

RL= 50 kΩRL= 50ΩInputCurrent–µA1401201008060402000

1

2

3

4

5

6

7

8

9

10

VIN–InputVoltage–V

00

1

2

3

4

5

6

7

8

9

10

VIN–InputVoltage–V

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TYPICALCHARACTERISTICS(continued)

OUTPUTVOLTAGE

vs

TEMPERATURE

5.1005.075

QUIESCENTCURRENT

vs

INPUTVOLTAGE

120110100

IL=0VOUT–OutputVoltage–VQuiescentCurrent–µA5.0505.0255.000

IL=100mA4.9754.9504.925

4.900

-40-25-105

IL=100µA9080706050403020100

203550658095110125012345678TA–Temperature–°CVIN–InputVoltage–V

QUIESCENTCURRENT

vs

INPUTVOLTAGE

120110100

IL=1mA8

IL=100mA76543210

QUIESCENTCURRENT

vs

INPUTVOLTAGE

QuiescentCurrent–µA807060504030201000

1

2

3

4

5

6

7

8

VIN–InputVoltage–V

QuiescentCurrent–µA90

012345678

VIN–InputVoltage–V

8

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ADJUSTABLEMICROPOWERVOLTAGEREGULATORS

WITHSHUTDOWN

SLVS582D–APRIL2006–REVISEDMARCH2007

TYPICALCHARACTERISTICS(continued)

QUIESCENTCURRENT

vs

TEMPERATURE

109.59

IL=100mAVIN=6VQUIESCENTCURRENT

vs

TEMPERATURE

1009590

IL=100µAVIN=6VQuiescentCurrent–mAQuiescentCurrent–µA8.587.576.565.5

5

-40-25-10

85807570656055

50

-40-25-10

5203550658095110125

5203550658095110125

TA–Temperature–°C

TA–Temperature–°C

SHORT-CIRCUITCURRENT

vs

TEMPERATURE

250225

DROPOUTVOLTAGE

vs

TEMPERATURE

500450

(VIN–VOUT)–DropoutVoltage–mVShort-CircuitCurrent–A20017515012510075

50

-40-25-10

40035030025020015010050

RL=100µARL=100mA5203550658095110125

0

-40-25-10

5203550658095110125

TA–Temperature–°C

TA–Temperature–°C

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TYPICALCHARACTERISTICS(continued)

DROPOUTVOLTAGE

vs

OUTPUTCURRENT

400350

MinimumOperatingVoltage–VLP2951MINIMUMOPERATINGVOLTAGE

vs

TEMPERATURE

21.951.91.851.81.751.71.65

1.6

-40-25-10

(VIN–VOUT)–DropoutVoltage–mV300250200150100500

0.0001

0.0010.010.15203550658095110125

IO–OutputCurrent–ATA–Temperature–°C

LP2951FEEDBACKBIASCURRENT

vs

TEMPERATURE

876

LP2951ERRORCOMPARATOROUTPUT

vs

INPUTVOLTAGE

3025FEEDBACKBiasCurrent–nA20151050-5-10-15-20-55

ERROROutput–V50-kWresistor󰀀toexternal󰀀5-V󰀀supply5432100

1

2

3

4

5

6

7

8

VIN–InputVoltage–V

50-kWresistorto󰀀VOUT-30-520457095120145

TA–Temperature–°C

10

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LP2950,LP2951

ADJUSTABLEMICROPOWERVOLTAGEREGULATORS

WITHSHUTDOWN

SLVS582D–APRIL2006–REVISEDMARCH2007

TYPICALCHARACTERISTICS(continued)

LP2951ERRORCOMPARATORSINKCURRENT

vs

OUTPUTLOWVOLTAGE

21.751.51.25

TA= 25TA= 125LINETRANSIENTRESPONSE

vsTIME

InputVoltage

2V/div

ISINK–SinkCurrent–mA10.750.50.2500

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

VOL–OutputLowVoltage–V

OutputVoltage

80 mV/div

TA= –40LOADTRANSIENTRESPONSE

vsTIME

(VOUT=5V,CL=1µF)LOADTRANSIENTRESPONSE

vsTIME

(VOUT=5V,CL=10µF)

OutputVoltage

100 mV/div

OutputVoltage

100 mV/div

Output Load100 mA/div

Output Load100 mA/div

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TYPICALCHARACTERISTICS(continued)

ENABLETRANSIENTRESPONSE

vsTIME

(CL=1µF,IL=1mA)

ENABLETRANSIENTRESPONSE

vsTIME

(CL=10µF,IL=1mA)

OUTPUTIMPEDANCE

vs

FREQUENCY

100

IL=100µAΩhmOutputImpedance–ORIPPLEREJECTION

vs

FREQUENCY

9080706050

IL=100µA4030

IL=010

1

IL=1mA0.1

IL=100mAPower-SupplyRippleRejection–dB0.01

101.E+01

1001.E+021k1.E+0310k1.E+04100k1.E+051M1.E+06

20

101.E+01

VIN=6VCL=1µF1001.E+02

1k1.E+03

10k1.E+04

100k1.E+05

1M1.E+06

f–Frequency–Hz

f–Frequency–Hz

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ADJUSTABLEMICROPOWERVOLTAGEREGULATORS

WITHSHUTDOWN

SLVS582D–APRIL2006–REVISEDMARCH2007

TYPICALCHARACTERISTICS(continued)

RIPPLEREJECTION

vs

FREQUENCY

100

VIN=6V90

CL=1µFRIPPLEREJECTION

vs

FREQUENCY

100

VIN=6V90Power-SupplyRippleRejection–dB8070605040

IL=100mA302010101.E+01

IL=50mACL=1µFPower-SupplyRippleRejection–dB80706050403020

IL=10mA10

1.E+0110

1.E+02100

1.E+031k

1.E+0410k

1.E+05100k

1.E+061M

IL=1mA1001.E+021k1.E+0310k1.E+04100k1.E+051M1.E+06

f–Frequency–Hz

f–Frequency–Hz

LP2951OUTPUTNOISE

vs

FREQUENCY

6

LP2951DIVIDERRESISTANCE

vs

TEMPERATURE

400

RP2P4–Pin2toPin4Resistance–kW5

35030025020015010050

0

-40-25-10

OutputNoise–µV4

CL=200µF3

CL=1µF2

1

CL=3.3µF0

1.E+0110

1.E+02100

1.E+031k

1.E+0410k

1.E+05100k

5203550658095110125

f–Frequency–Hz

TA–Temperature–°C

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TYPICALCHARACTERISTICS(continued)

SHUTDOWNTHRESHOLDVOLTAGE(OFFTOON)

vs

TEMPERATURE

1.71.6

SHUTDOWNTHRESHOLDVOLTAGE(ONTOOFF)

vs

TEMPERATURE

1.71.6InputLogicVoltage(ONtoOFF)–V1.51.41.31.21.110.9

0.8

-40-25-10

InputLogicVoltage(OFFtoON)–V1.51.41.31.21.110.9

0.8

-40-25-10

5203550658095110125

TA–Temperature–°C

5203550658095110125

TA–Temperature–°C

LINEREGULATION

vs

INPUTVOLTAGE

65

OutputVoltageChange–mV43210-1-20

5

10

15

20

25

30

VIN–InputVoltage–V

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APPLICATIONINFORMATION

InputCapacitor(CIN)

A1-µF(tantalum,ceramic,oraluminum)electrolyticcapacitorshouldbeplacedlocallyattheinputoftheLP2950orLP2951ifthereis,orwillbe,significantimpedancebetweentheacfiltercapacitorandtheinput;forexample,ifabatteryisusedastheinputoriftheacfiltercapacitorislocatedmorethan10inaway.TherearenoESRrequirementsforthiscapacitor,andthecapacitancecanbeincreasedwithoutlimit.

OutputCapacitor(COUT)

AswithmostPNPLDOs,stabilityconditionsrequiretheoutputcapacitortohaveaminimumcapacitanceandanESRthatfallswithinacertainrange.

CapacitanceValue

ForVOUT≥5V,aminimumof1µFisrequired.ForlowerVOUT,theregulator’sloopgainisrunningclosertounitygainand,thus,haslowerphasemargins.Consequently,alargercapacitanceisneededforstability.ForVOUT=3Vor3.3V,aminimumof2.2µFisrecommended.Forworstcase,VOUT=1.23V(usingtheADJversion),aminimumof3.3µFisrecommended.COUTcanbeincreasedwithoutlimitandonlyimprovestheregulatorstabilityandtransientresponse.Regardlessofitsvalue,theoutputcapacitorshouldhavearesonantfrequencylessthan500kHz.

Theminimumcapacitancevaluesgivenaboveareformaximumloadcurrentof100mA.Ifthemaximumexpectedloadcurrentislessthan100mA,thenlowervaluesofCOUTcanbeused.Forinstance,ifIOUT<10mA,thenonly0.33µFisrequiredforCOUT.ForIOUT<1mA,0.1µFissufficientforstabilityrequirements.Thus,foraworst-caseconditionof100-mAloadandVOUT=VREF=1.235V(representingthehighestloadcurrentandlowestloopgain),aminimumCOUTof3.3µFisrecommended.

FortheLP2950,noloadstabilityisinherentinthedesign—adesirablefeatureinCMOScircuitsthatareputinstandby(suchasRAMkeep-aliveapplications).IftheLP2951isusedwithexternalresistorstosettheoutputvoltage,aminimumloadcurrentof1µAisrecommendedthroughtheresistordivider.

ESRRange

TheregulatorcontrolloopreliesontheESRoftheoutputcapacitortoprovideazerotoaddsufficientphasemargintoensureunconditionalregulatorstability;thisrequirestheclosed-loopgaintointersecttheopen-loopresponseinaregionwheretheopen-loopgainrollsoffat20dB/decade.Thisensuresthatthephasealwaysislessthan180°(phasemargingreaterthan0°)atunitygain.Thus,aminimum-maximumrangefortheESRmustbeobserved.

TheupperlimitofthisESRrangeisestablishedbythefactthattoohighanESRcouldresultinthezerooccurringtoosoon,causingthegaintorollofftooslowly,which,inturnallowsathirdpoletoappearbeforeunitygainandintroduceenoughphaseshifttocauseinstability.ThistypicallylimitsthemaxESRtoapproximately5Ω.

Conversely,thelowerlimitoftheESRistiedtothefactthattoolowanESRshiftsthezerotoofarout(pastunitygain)and,thus,allowsthegaintorolloffat40dB/decadeatunitygain,witharesultingphaseshiftofgreaterthan180°.Typically,thislimitstheminimumESRtoapproximately20mΩto30mΩ.ForspecificESRrequirements,seeTypicalCharacteristics.

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LP2950,LP2951

ADJUSTABLEMICROPOWERVOLTAGEREGULATORSWITHSHUTDOWN

SLVS582D–APRIL2006–REVISEDMARCH2007

www.ti.com

APPLICATIONINFORMATION(continued)

CapacitorTypes

Mosttantalumoraluminumelectrolyticsaresuitableforuseattheinput.Film-typecapacitorsalsowork,butathighercost.Whenoperatingatlowtemperature,careshouldbetakenwithaluminumelectrolytics,astheirelectrolytesoftenfreezeat–30°C.Forthisreason,solidtantalumcapacitorsshouldbeusedattemperaturesbelow–25°C.

Ceramiccapacitorscanbeused,butduetotheirlowESR(aslowas5mΩto10mΩ),theymaynotmeettheminimumESRrequirementpreviouslydiscussed.Ifaceramiccapacitorisused,aseriesresistorbetween0.1Ωto2ΩmustbeaddedtomeettheminimumESRrequirement.Inaddition,ceramiccapacitorshaveoneglaringdisadvantagethatmustbetakenintoaccount—apoortemperaturecoefficient,wherethecapacitancecanvarysignificantlywithtemperature.Forinstance,alarge-valueceramiccapacitor(≥2.2µF)canlosemorethanhalfofitscapacitanceastemperaturerisesfrom25°Cto85°C.Thus,a2.2-µFcapacitorat25°CdropswellbelowtheminimumCOUTrequiredforstabilityasambienttemperaturerises.Forthisreason,selectanoutputcapacitorthatmaintainstheminimum2.2-µFrequiredforstabilityfortheentireoperatingtemperaturerange.

CBYPASS:NoiseandStabilityImprovement

IntheLP2951,anexternalFEEDBACKpindirectlyconnectedtotheerroramplifiernoninvertinginputcanallowstraycapacitancetocauseinstabilitybyshuntingtheerroramplifierfeedbacktoGND,especiallyathighfrequencies.Thisisworsenedifhigh-valueexternalresistorsareusedtosettheoutputvoltage,becauseahighresistanceallowsthestraycapacitancetoplayamoresignificantrole;i.e.,alargerRCtimedelayisintroducedbetweentheoutputoftheerroramplifieranditsFEEDBACKinput,leadingtomorephaseshiftandlowerphasemargin.Asolutionistoadda100-pFbypasscapacitor(CBYPASS)betweenOUTPUTandFEEDBACK;becauseCBYPASSisinparallelwithR1,itlowerstheimpedanceseenatFEEDBACKathighfrequencies,ineffectoffsettingtheeffectoftheparasiticcapacitancebyprovidingmorefeedbackathigherfrequencies.Morefeedbackforcestheerroramplifiertoworkatalowerloopgain,soCOUTshouldbeincreasedtoaminimumof3.3µFtoimprovetheregulator’sphasemargin.

CBYPASScanbealsousedtoreduceoutputnoiseintheLP2951.Thisbypasscapacitorreducestheclosedloopgainoftheerroramplifieratthehighfrequency,sonoisenolongerscaleswiththeoutputvoltage.Thisimprovementismorenoticeablewithhigheroutputvoltages,becauseloopgainreductionisgreatest.AsuitableCBYPASSiscalculatedasshowninEquation1:

1f(CBYPASS)]200Hz³CBYPASS+

2p R1 200Hz(1)Onthe3-pinLP2950,noisereductioncanbeachievedbyincreasingtheoutputcapacitor,whichcausesthe

regulatorbandwidthtobereduced,therefore,eliminatinghigh-frequencynoise.However,thismethodisrelativelyinefficient,asincreasingCOUTfrom1µFto220µFonlyreducestheregulator’soutputnoisefrom430µVto160µV(overa100-kHzbandwidth).

ERRORFunction(LP2951Only)

TheLP2951hasalow-voltagedetectioncomparatorthatoutputsalogiclowwhentheoutputvoltagedropsby≈6%fromitsnominalvalue,andoutputsalogichighwhenVOUThasreached≈95%ofitsnominalvalue.This95%ofnominalfigureisobtainedbydividingthebuilt-inoffsetof≈60mVbythe1.235-Vbandgapreference,andremainsindependentoftheprogrammedoutputvoltage.Forexample,thetrip-pointthreshold(ERRORoutputgoeshigh)typicallyis4.75Vfora5-Voutputand11.4Vfora12-Voutput.Typically,thereisahysteresisof15mVbetweenthethresholdsforhighandlowERRORoutput.

AtimingdiagramisshowninFigure1forERRORvsVOUT(5V),asVINisrampedupanddown.ERRORbecomesvalid(low)whenVIN≈1.3V.WhenVIN≈5V,VOUT=4.75V,causingERRORtogohigh.Becausethedropoutvoltageisloaddependent,theoutputtrip-pointthresholdisreachedatdifferentvaluesofVIN,dependingontheloadcurrent.Forinstance,athigherloadcurrent,ERRORgoeshighataslightlyhighervalueofVIN,andviceversaforlowerloadcurrent.Theoutput-voltagetrippointremainsat≈4.75V,regardlessoftheload.NotethatwhenVIN≤1.3V,theERRORcomparatoroutputisturnedoffandpulledhightoitspullupvoltage.IfVOUTisusedasthepullupvoltage,ratherthananexternal5-Vsource,ERRORtypicallyis≈1.2V.Inthiscondition,anequalresistordivider(10kΩissuitable)canbetiedtoERRORtodividedownthevoltagetoavalidlogiclowduringanyfaultcondition,whilestillenablingalogichighduringnormaloperation.

16

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LP2950,LP2951

ADJUSTABLEMICROPOWERVOLTAGEREGULATORS

WITHSHUTDOWN

SLVS582D–APRIL2006–REVISEDMARCH2007

APPLICATIONINFORMATION(continued)

OutputVoltage

4.75 V

ERRORInputVoltage

5 V

1.3 V

Figure1.ERROROutputTiming

BecausetheERRORcomparatorhasanopen-collectoroutput,anexternalpullupresistorisrequiredtopulltheoutputuptoVOUToranothersupplyvoltage(upto30V).Theoutputofthecomparatorisratedtosinkupto400µA.Asuitablerangeofvaluesforthepullupresistorisfrom100kΩto1MΩ.IfERRORisnotused,itcanbeleftopen.

ProgrammingOutputVoltage(LP2951Only)

AuniquefeatureoftheLP2951isitsabilitytooutputeitherafixedvoltageoranadjustablevoltage,dependingontheexternalpinconnections.Tooutputtheinternallyprogrammedfixedvoltage,tietheSENSEpintotheOUTPUTpinandtheFEEDBACKpintotheVTAPpin.Alternatively,auser-programmablevoltagerangingfromtheinternal1.235-Vreferencetoa30-Vmaxcanbesetbyusinganexternalresistordividerpair.TheresistordivideristiedtoVOUT,andthedivided-downvoltageistieddirectlytoFEEDBACKforcomparisonagainsttheinternal1.235-Vreference.Tosatisfythesteady-stateconditioninwhichitstwoinputsareequal,theerroramplifierdrivestheoutputtoequalEquation2:

VOUT+VREF 1)R1*IFBR1

R2ǒǓ(2)

Where:

VREF=1.235VappliedacrossR2

IFB=FEEDBACKbiascurrent,typically20nA

Aminimumregulatoroutputcurrentof1µAmustbemaintained.Thus,inanapplicationwhereano-loadconditionisexpected(forexample,CMOScircuitsinstandby),this1-µAminimumcurrentmustbeprovidedbytheresistorpair,effectivelyimposingamaximumvalueofR2=1.2MΩ(1.235V/1.2MΩ≈1µA).

IFB=20nAintroducesanerrorof≈0.02%inVOUT.ThiscanbeoffsetbytrimmingR1.Alternatively,increasingthedividercurrentmakesIFBlesssignificant,thus,reducingitserrorcontribution.Forinstance,usingR2=100kΩreducestheerrorcontributionofIFBto0.17%byincreasingthedividercurrentto≈12µA.Thisincreaseinthedividercurrentstillissmallcomparedtothe600-µAtypicalquiescentcurrentoftheLP2951undernoload.

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PACKAGEOPTIONADDENDUM

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11-Jun-2007

PACKAGINGINFORMATION

OrderableDeviceLP2950-30LPLP2950-30LPRLP2950-33LPE3LP2950-33LPRE3LP2950-50LPRE3LP2951-30DLP2951-30DG4LP2951-30DRLP2951-30DRG4LP2951-33DLP2951-33DG4LP2951-33DRLP2951-33DRG4LP2951-50DLP2951-50DG4LP2951-50DRLP2951-50DRG4

LP2951DLP2951DR

(1)

Status(1)ACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVEACTIVE

PackageTypeTO-92TO-92TO-92TO-92TO-92SOICSOICSOICSOICSOICSOICSOICSOICSOICSOICSOICSOICSOICSOIC

PackageDrawingLPLPLPLPLPDDDDDDDDDDDDDD

PinsPackageEcoPlan(2)

Qty3333388888888888888

100020001000200020007575

Pb-Free(RoHS)Pb-Free(RoHS)Pb-Free(RoHS)Pb-Free(RoHS)Pb-Free(RoHS)Green(RoHS&noSb/Br)Green(RoHS&noSb/Br)

Lead/BallFinish

CUSNCUSNCUSNCUSNCUSNCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAU

MSLPeakTemp(3)N/AforPkgTypeN/AforPkgTypeN/AforPkgTypeN/AforPkgTypeN/AforPkgTypeLevel-1-260C-UNLIMLevel-1-260C-UNLIMLevel-1-260C-UNLIMLevel-1-260C-UNLIMLevel-1-260C-UNLIMLevel-1-260C-UNLIMLevel-1-260C-UNLIMLevel-1-260C-UNLIMLevel-1-260C-UNLIMLevel-1-260C-UNLIMLevel-1-260C-UNLIMLevel-1-260C-UNLIMLevel-1-260C-UNLIMLevel-1-260C-UNLIM

2500Green(RoHS&

noSb/Br)2500Green(RoHS&

noSb/Br)7575

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

2500Green(RoHS&

noSb/Br)2500Green(RoHS&

noSb/Br)7575

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

2500Green(RoHS&

noSb/Br)2500Green(RoHS&

noSb/Br)75

Green(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.Wheredesignedtobesoldered

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PACKAGEOPTIONADDENDUM

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11-Jun-2007

athightemperatures,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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PACKAGEMATERIALSINFORMATION

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16-Jun-2007

TAPEANDREELINFORMATION

PackMaterials-Page1

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PACKAGEMATERIALSINFORMATION

www.ti.com

16-Jun-2007

DevicePackagePinsSite

ReelDiameter(mm)330330330330

ReelWidth(mm)12121212

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

P1(mm)8888

WPin1(mm)Quadrant12121212

Q1Q1Q1Q1

LP2951-30DRLP2951-33DRLP2951-50DRLP2951DR

DDDD

8888

FMXFMXFMXFMX

6.46.46.46.4

5.25.25.25.2

2.12.12.12.1

TAPEANDREELBOXINFORMATION

DeviceLP2951-30DRLP2951-33DRLP2951-50DRLP2951DR

Package

DDDD

Pins8888

SiteFMXFMXFMXFMX

Length(mm)

342.9342.9342.9342.9

Width(mm)336.6336.6336.6336.6

Height(mm)

20.6420.6420.6420.64

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16-Jun-2007

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MSOT002A – OCTOBER 1994 – REVISED NOVEMBER 2001 MECHANICAL DATA LP (O-PBCY-W3) 0.205 (5,21)0.175 (4,44)PLASTIC CYLINDRICAL PACKAGE0.165 (4,19)0.125 (3,17)DIA0.210 (5,34)0.170 (4,32)SeatingPlane0.157 (4,00) MAX0.050 (1,27)C0.500 (12,70) MIN0.104 (2,65)FORMED LEAD OPTION0.022 (0,56)0.016 (0,41)STRAIGHT LEAD OPTIOND0.016 (0,41)0.014 (0,35)0.135 (3,43) MIN0.105 (2,67)0.095 (2,41)0.055 (1,40)0.045 (1,14)1230.105 (2,67)0.080 (2,03)NOTES:A.All linear dimensions are in inches (millimeters).B.This drawing is subject to change without notice.C.Lead dimensions are not controlled within this area0.105 (2,67)0.080 (2,03)4040001-2/C 10/01D.FAlls within JEDEC TO -226 Variation AA (TO-226 replaces TO-92)E.Shipping Method:Straight lead option available in bulk pack only.Formed lead option available in tape & reel or ammo pack.POST OFFICE BOX 655303 DALLAS, TEXAS 75265•1元器件交易网www.cecb2b.com

MSOT002A – OCTOBER 1994 – REVISED NOVEMBER 2001MECHANICAL DATA LP (O-PBCY-W3) PLASTIC CYLINDRICAL PACKAGE0.539 (13,70)0.460 (11,70)1.260 (32,00)0.905 (23,00)0.650 (16,50)0.610 (15,50)0.098 (2,50)0.020 (0,50) MIN0.384 (9,75)0.335 (8,50)0.433 (11,00)0.335 (8,50)0.748 (19,00)0.217 (5,50)0.748 (19,00)0.689 (17,50)0.114 (2,90)0.094 (2,40)0.114 (2,90)0.094 (2,40)0.266 (6,75)0.234 (5,95)0.512 (13,00)0.488 (12,40)0.169 (4,30)0.146 (3,70)DIATAPE & REEL4040001-3/C 10/01NOTES:A.All linear dimensions are in inches (millimeters).B.This drawing is subject to change without notice.C.Tape and Reel information for the Format Lead Option package.2POST OFFICE BOX 655303 DALLAS, TEXAS 75265•元器件交易网www.cecb2b.com

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