www.ti.com
TL5209
500-mALOW-NOISELOW-DROPOUTVOLTAGEREGULATOR
WITHSHUTDOWN
SLVS581–SEPTEMBER2006
FEATURES
••••
AdjustableandFixedVoltagesof1.8V,2.5V,3V,3.3V,and5V
1%/2%Accuracy(25°C/FullRange)
500-mV(Max)DropoutatFullLoadof500mAExtremelyTightRegulationOverTemperatureRange
–0.1%/V(Max)LineRegulation–0.7%(Max)LoadRegulation
Ultra-LowNoiseCapability(300nV/√HzTyp)ShutdownCurrentof3µA(Max)LowTemperatureCoefficient
FIXED VOLTAGE...D PACKAGE
(TOP VIEW)
••••
•••
•
CurrentLimitingandThermalProtectionStableWithMinimumLoadof1mAReverse-BatteryProtectionApplications
–PortableApplications(PDAs,Laptops,CellPhones)
–ConsumerElectronics–Post-RegulationforSMPS
AvailableinConvenientSurface-MountPackages:SOT-223,SOIC-8,andTO-263
FIXED VOLTAGE...DCY (SOT-223) PACKAGE
(TOP VIEW)
ADJUSTABLE VOLTAGE...D PACKAGE
(TOP VIEW)
ENINOUTBYP
1234
8765
GNDGNDGNDGNDENINOUTADJ/BYP
1234
8765
GNDGNDGNDGND
GND
123
OUTGNDIN FIXED VOLTAGE...KTT (TO-263) PACKAGE
(TOP VIEW)
54321
ADJUSTABLE VOLTAGE...KTT (TO-263) PACKAGE
(TOP VIEW)
54321
BYPOUTGNDINENADJ/BYPOUTGNDINEN
GNDDESCRIPTION/ORDERINGINFORMATION
TheTL5209isanefficientPNPlow-dropout(LDO)regulatorthatiswellsuitedforportableapplications.IthassignificantlylowerquiescentcurrentthanpreviouslywasavailablefromtraditionalPNPregulatorsandallowsforashutdowncurrent(SOIC-8andTO-263)ofonly0.05µA(typical).TheTL5209alsohasverygooddropoutvoltagecharacteristics,requiringamaximumdropoutof60mVatlightloadsand500mVatfullload.Inaddition,theLDOalsohas1%outputvoltageaccuracyandextremelytightlineandloadregulationthatishardtomatchbyitsCMOScounterparts.
Fornoise-sensitiveapplications,theTL5209allowsforlow-noisecapabilityviaanexternalbypasscapacitorconnectedtotheBYPASSpin(SOIC-8andTO-263),whichreducestheoutputnoiseoftheregulator.Otherfeaturesincludecurrentlimiting,thermalshutdown,reverse-batteryprotection,andlowtemperaturecoefficient.TheTL5209isavailableinadjustableoutputandfixed-outputversionsof1.8V,2.5V,3V,3.3V,and5V.Offeredinsurface-mountpackagesofSOT-223,SOIC,andTO-263,theTL5209ischaracterizedforoperationoverthevirtualjunctiontemperaturerangesof–40°Cto125°C.
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.ProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.Productionprocessingdoesnotnecessarilyincludetestingofallparameters.
GNDCopyright©2006,TexasInstrumentsIncorporated
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TL5209
500-mALOW-NOISELOW-DROPOUTVOLTAGEREGULATORWITHSHUTDOWN
SLVS581–SEPTEMBER2006
www.ti.com
ORDERINGINFORMATION
TJ
VOUT(NOM)
SOIC–D
1.8V
SOT-223–DCYTO-263–KTTSOIC–D
2.5V
SOT-223–DCYTO-263–KTTSOIC–D
3V
–40°Cto125°C
3.3V
SOT-223–DCYTO-263–KTTSOIC–DSOT-223–DCYTO-263–KTTSOIC–D
5V
SOT-223–DCYTO-263–KTT
ADJ
(1)
SOIC–DTO-263–KTT
PACKAGE(1)
Reelof2000Reelof2000Reelof2000Reelof2000Reelof2000Reelof2000Reelof2000Reelof2000Reelof2000Reelof2000Reelof2000Reelof2000Reelof2000Reelof2000Reelof2000Reelof2000Reelof2000
ORDERABLEPARTNUMBERTL5209-18DRTL5209-18DCYRTL5209-18KTTRTL5209-25DRTL5209-25DCYRTL5209-25KTTRTL5209-30DRTL5209-30DCYRTL5209-30KTTRTL5209-33DRTL5209-33DCYRTL5209-33KTTRTL5209-50DRTL5209-50DCYRTL5209-50KTTRTL5209DRTL5209KTTR
TOP-SIDEMARKINGTL520918TATL5209-18TL520925TBTL5209-25TL520930TCTL5209-30TL520933TDTL5209-33TL520950TETL5209-50TL5209TL5209
Packagedrawings,standardpackingquantities,thermaldata,symbolization,andPCBdesignguidelinesareavailableatwww.ti.com/sc/package.
2
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TL5209
500-mALOW-NOISELOW-DROPOUTVOLTAGEREGULATOR
WITHSHUTDOWN
SLVS581–SEPTEMBER2006
BLOCKDIAGRAMS
VIN
INR1+−BandgapReferenceR2OUTVOUTCOUTCurrent Limiting andThermal ShutdownGNDFigure1.FixedRegulator(SOT-223only)
VIN
INR1OUTVOUTCOUTBYP+−ENCurrent Limiting andThermal ShutdownGNDBandgapReferenceR2CBYP(optional)Figure2.Low-NoiseFixedRegulator(SOICandTO-263only)
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TL5209
500-mALOW-NOISELOW-DROPOUTVOLTAGEREGULATORWITHSHUTDOWN
SLVS581–SEPTEMBER2006
www.ti.com
BLOCKDIAGRAMS(continued)
INOUTCOUTVINVOUTR1+−ENCurrent Limiting andThermal ShutdownGNDBandgapReferenceADJ/BYPR2CBYP(optional)Figure3.Low-NoiseAdjustableRegulator(SOICandTO-263only)
4
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TL5209
500-mALOW-NOISELOW-DROPOUTVOLTAGEREGULATOR
WITHSHUTDOWN
SLVS581–SEPTEMBER2006
AbsoluteMaximumRatings(1)
overoperatingfree-airtemperaturerange(unlessotherwisenoted)
MIN
VITstg(1)
ContinuousinputvoltagerangeStoragetemperaturerange
–20–65
MAX20150
UNITV°C
StressesbeyondthoselistedunderAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderRecommendedOperatingConditionsisnotimplied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.
PackageThermalData(1)
PACKAGESOIC(D)SOT-223(DCY)TO-263(KTT)
(1)
BOARDHighK,JESD51-7HighK,JESD51-7HighK,JESD51-5
θJA97°C/W53°C/W26.5°C/W
θJC39°C/W4°C/W31.8°C/W
MaximumpowerdissipationisafunctionofTJ(max),θJA,andTA.ThemaximumallowablepowerdissipationatanyallowableambienttemperatureisPD=(TJ(max)–TA)/θJA.OperatingattheabsolutemaximumTJof150°Ccanaffectreliability.
RecommendedOperatingConditions
MIN
VIVENTJ
InputvoltageEnableinputvoltage
Operatingjunctiontemperaturerange
2.50–40
MAX16VI125
UNITVV°C
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TL5209
500-mALOW-NOISELOW-DROPOUTVOLTAGEREGULATORWITHSHUTDOWN
SLVS581–SEPTEMBER2006
www.ti.com
ElectricalCharacteristics
VIN=VOUT+1V,COUT=4.7µF,IOUT=1mA,fullrangeTJ=–40°Cto125°C
PARAMETEROutputvoltageaccuracy
αVOUT
OutputvoltagetemperaturecoefficientLineregulationLoadregulation
VIN=(VOUT+1V)to16VIOUT=1mAto500mA(1)IOUT=1mAIOUT=50mA
VIN–VOUTDropoutvoltage(2)
IOUT=100mAIOUT=500mAVEN≥3V,IOUT=1mAVEN≥3V,IOUT=50mA
IQ
Quiescentcurrent
VEN≥3V,IOUT=100mAVEN≥3V,IOUT=500mA
IminISD
Minimumloadcurrent(3)
VEN≤0.4V
ShutdowncurrentRipplerejection
ILIMIT
Currentlimit
VEN≤0.18Vf=120HzVOUT=0V
VIN=16V,500-mAloadpulsefort=10ms
VOUT=2.5V,IOUT=50mA,COUT=2.2µF,CBYP=0IOUT=50mA,COUT=2.2µF,CBYP=470pF(5)
VEN=logicLOW(shutdown)VEN=logicHIGH(enabled)
TESTCONDITIONSVOUT=2.5VforADJonly
TJ25°CFullrangeFullrange25°CFullrange25°CFullrange25°CFullrange25°CFullrange25°CFullrange25°CFullrange25°CFullrange25°CFullrange25°CFullrange25°CFullrangeFullrange25°C25°CFullrange25°C25°CFullrange25°C25°C25°C25°CFullrange25°C
2
0.05500
nV/√Hz300
0.40.18
V
75700
9001000
0.050.1
8
dBmA%/W
81.2350100350150115450.05
MIN–1–2
400.009
0.050.10.50.7608017525025030050060014017065090023202513
µAmAmAµAmV
TYP
MAX
12
UNIT%ppm/°C%/V%
∆VOUT/∆PDThermalregulation(4)
Vn
Outputnoise
VEN
Enablelogicvoltage
(1)(2)(3)(4)(5)6
Lowdutycycletestingisusedtomaintainthejunctiontemperatureasclosetotheambienttemperatureaspossible.Changesinoutputvoltageduetothermaleffectsarecoveredseparatelybythethermalregulationspecification.
Dropoutisdefinedastheinputtooutputdifferentialatwhichtheoutputdrops2%belowitsnominalvaluemeasuredat1-Vdifferential.Forstabilityacrosstheinputvoltageandtemperature.ForADJversions,theminimumcurrentcanbesetbyR1andR2.
Thermalregulationisdefinedasthechangeinoutputvoltageataspecifiedtimeafterachangeinpowerdissipationisapplied,excludinglineandloadregulationeffects.
CBYPisoptionalandconnectedtotheBYP/ADJpin.
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TL5209
500-mALOW-NOISELOW-DROPOUTVOLTAGEREGULATOR
WITHSHUTDOWN
SLVS581–SEPTEMBER2006
ElectricalCharacteristics(continued)
VIN=VOUT+1V,COUT=4.7µF,IOUT=1mA,fullrangeTJ=–40°Cto125°C
PARAMETER
TESTCONDITIONSVEN≤0.4V(shutdown)
IEN
Enableinputcurrent
VEN≤0.18V(shutdown)VEN≥2V(enabled)
TJ25°CFullrange25°CFullrange
MIN
TYP0.010.015
MAX–1–22025
µAUNIT
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TL5209
500-mALOW-NOISELOW-DROPOUTVOLTAGEREGULATORWITHSHUTDOWN
SLVS581–SEPTEMBER2006
www.ti.com
TYPICALCHARACTERISTICS
POWER-SUPPLYREJECTIONRATIO
0-10-20-30VIN=3.5VCOUT=2.2µFCBYP=0µFIOUT=1mAPOWER-SUPPLYREJECTIONRATIO
0-10-20-30PSRR–dB-40-50-60-70-80-90-1001.E+0110VIN=3.5VCOUT=2.2µFCBYP=0.01µFIOUT=1mAPSRR–dB-40-50-60-70-80-90-100-110101.E+011001.E+021k1.E+0310k1.E+04100k1.E+051M1.E+061.E+021001.E+031k1.E+0410k1.E+05100k1.E+061MFrequency–Hz
Frequency–HzPOWER-SUPPLYREJECTIONRATIO
-10-20-30-40PSRR–dB0
POWER-SUPPLYREJECTIONRATIO
VIN=3.5VCOUT=2.2µFCBYP=0µFIL=10mAPSRR–dB-10-20-30-40-50-60-70-80-90
VIN=3.5VCOUT=2.2µFCBYP=0.01µFIOUT=10mA-50-60-70-80-90-100-110101.E+011001.E+021k1.E+0310k1.E+04100k1.E+051M1.E+06-100
1.E+0110
1.E+021001.E+031k1.E+0410k1.E+05100k1.E+061M
Frequency – Hzf–Frequency–Hz
Frequency–Hz
8
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TL5209
500-mALOW-NOISELOW-DROPOUTVOLTAGEREGULATOR
WITHSHUTDOWN
SLVS581–SEPTEMBER2006
TYPICALCHARACTERISTICS(continued)
POWER-SUPPLYREJECTIONRATIO
0-10-20-30
VIN=3.5VCOUT=2.2µFCBYP=0µFIOUT=100mAPOWER-SUPPLYREJECTIONRATIO
0-10-20-30VIN=3.5VCOUT=2.2µFCBYP=0.01µFIOUT=100mAPSRR–dBPSRR–dB-40-50-60-70-80-90-100
1.E+0110
-40-50-60-70-80-90-100101.E+011.E+021001.E+031k1.E+0410k1.E+05100k1.E+061M1001.E+021k1.E+0310k1.E+04100k1.E+051M1.E+06Frequency–HzFrequency–Hz
POWER-SUPPLYRIPPLEREJECTION
vs
VOLTAGEDROP
1201101009080PSRR–dBIL=100mAVOUT=2.5VCOUT=2.2µFCBYP=0µFIL=10mAIL=1mA1201101009080
POWER-SUPPLYRIPPLEREJECTION
vs
VOLTAGEDROP
VOUT=2.5VCOUT=2.2µFCBYP=0.01µFIL=1mAIL=10mAPSRR–dB7060504030201000
0.1
0.2
0.3
706050403020100
IL=100mA0.40.500.10.20.30.40.5
VoltageDrop–VVoltageDrop–V
Figure4.
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TL5209
500-mALOW-NOISELOW-DROPOUTVOLTAGEREGULATORWITHSHUTDOWN
SLVS581–SEPTEMBER2006
www.ti.com
TYPICALCHARACTERISTICS(continued)
NOISEPERFORMANCE
0.7
NOISEPERFORMANCE
0.8
VIN=3.5V0.70.6Noise –V µVq/√Noise–µ/srHt(zHz)COUT=2.2µFCBYP=0µFIL=100mAIL=10mAoise –V µV/√HNoNise–µ/sqrt(zHz)0.60.50.40.30.2
IL=100mAIL=1mA0.50.40.30.20.10
101.E+01
IL=10mAIL=1mAVIN=3.5V0.1
COUT=2.2µFCBYP=0.01µF1001.E+02
1k1.E+03
10k1.E+04
100k1.E+05
0
101.E+01
1001.E+021k1.E+0310k1.E+04100k1.E+05
Frequency–Hz
Frequency–Hz
DROPOUTVOLTAGE
vs
LOADCURRENT
2.55
OUTPUTVOLTAGE
vs
TEMPERATURE
500450
VOUT=2.5VCOUT=2.2µFCBYP=0VOUT–OutputVoltage–V2.542.532.522.512.502.492.482.472.46
VIN=3.5VCOUT=4.7µFIL=1mAVDO–DropoutVoltage–mV4003503002502001501005000
50100150200250300350400450500
IL–LoadCurrent–mA
2.45
-40-25-10
5203550658095110125
TA–Temperature–°C
10
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TL5209
500-mALOW-NOISELOW-DROPOUTVOLTAGEREGULATOR
WITHSHUTDOWN
SLVS581–SEPTEMBER2006
TYPICALCHARACTERISTICS(continued)
GROUNDCURRENT
vs
LOADCURRENT
2018VIN=3.5VCOUT=4.7µFCIN=1µFGROUNDCURRENT
vs
SUPPLYVOLTAGE
21.8IGND–GNDPinCurrent–mA1.61.41.210.80.60.40.20IL=1mAIL=100mAIGND–GNDPinCurrent–mA1614121086420050100150200250300350400450500IL–LoadCurrent–mA012345678VCC–SupplyVoltage–VGROUNDCURRENTvsSUPPLYVOLTAGE201816IGND–GNDPinCurrent–mA2.53VIN=3.5VOUTPUTVOLTAGEvsLOADCURRENTIL=500mAVOUT–OutputVoltage–V2.52COUT=4.7µFIL=1mAto500mA14121086420012345678VCC–SupplyVoltage–V2.51TA=25°C2.502.49TA=125°C2.48TA=-40°C2.47050100150200250300350400450500IL–LoadCurrent–mASubmitDocumentationFeedback11元器件交易网www.cecb2b.com
TL5209
500-mALOW-NOISELOW-DROPOUTVOLTAGEREGULATORWITHSHUTDOWN
SLVS581–SEPTEMBER2006
www.ti.com
TYPICALCHARACTERISTICS(continued)
OUTPUTIMPEDANCE
vs
FREQUENCY
10VIN=3.5VCOUT=1µFVENB=2VOutputImpedance–Ω♦OutputImpedance–ΩℵOUTPUTIMPEDANCE
vs
FREQUENCY
10VIN=3.5VCOUT=2.2µFVENB=2V1IL=1mAIL=10mAIL=100mA1IL=1mAIL=10mAIL=100mA0.10.10.01101.E+011001.E+021k1.E+0310k1.E+04100k1.E+051M1.E+060.01101.E+011001.E+021k1.E+0310k1.E+04100k1.E+051M1.E+06Frequency–Hz
Frequency–HzOUTPUTVOLTAGE
vs
INPUTVOLTAGE
2.552.542.53VOUT–OutputVoltage–V2.522.512.502.492.482.472.462.45
3
6
9
12
15
18
VIN–InputVoltage–V
0
-40-25-100.5
LOADREGULATION
VIN=3.5Vto16VCOUT=4.7µFIL=1mALoadRegulation–%VIN=3.5VCOUT=4.7µF0.4
IL=1mAto500mA0.3
TA=25°CTA=125°CTA=-40°C0.2
0.1
5203550658095110125
TA–Temperature–°C
12
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TL5209
500-mALOW-NOISELOW-DROPOUTVOLTAGEREGULATOR
WITHSHUTDOWN
SLVS581–SEPTEMBER2006
TYPICALCHARACTERISTICS(continued)
LINEREGULATION
0.01
Load(mA)LOADTRANSIENTRESPONSE
COUT=10µFVIN= 3.5V
VIN=3.5Vto16VCOUT=4.7µF0.008LineRegulation–%/V1001
VENB= 2VCIN=1µF
IL=100µAChangeinOutputVoltage(mV)0.006
100-10
0.004
0.002
Time(25µs/div)
0-50
-250255075100125
TA–Temperature–°C
LOADTRANSIENTRESPONSE
COUT=2.2µFVIN= 3.5VVENB= 2V
Load(mA)CIN=1µF
1001
LOADTRANSIENTRESPONSE
COUT=10µFVIN= 3.5V
5001
ChangeinOutputVoltage(mV)VENB= 2VCIN=1µF
ChangeinOutputVoltage(mV)100-10
Load(mA)200-20
Time(25µs/div)
Time(25µs/div)
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TL5209
500-mALOW-NOISELOW-DROPOUTVOLTAGEREGULATORWITHSHUTDOWN
SLVS581–SEPTEMBER2006
www.ti.com
TYPICALCHARACTERISTICS(continued)
LOADTRANSIENTRESPONSE
COUT=10µF
InputVoltage(V)LINETRANSIENTRESPONSE
VIN= 3.5V
Load(mA)VENB= 2V
50010040200-20
CIN=1µF
4.53.5
COUT=1µFIL=1mA
ChangeinOutputVoltage(mV)ChangeinOutputVoltage(mV)20100-10
Time(500µs/div)
Time(25µs/div)
LINETRANSIENTRESPONSELINETRANSIENTRESPONSE
InputVoltage(V)4.53.5
COUT=2.2µFIL=1mA
InputVoltage(V)4.53.5
COUT=1µFIL=100mA
ChangeinOutputVoltage(mV)20100-10
ChangeinOutputVoltage(mV)20100-10
Time(500µs/div)Time(500µs/div)
LINETRANSIENTRESPONSE
ChangeinOutputVoltage(mV)InputVoltage(V)LINETRANSIENTRESPONSE
InputVoltage(V)4.53.5
COUT=2.2µFIL=100mA
4.53.5
COUT=1µFIL=500mA
ChangeinOutputVoltage(mV)20100-10
20100-10
Time(500µs/div)
Time(500µs/div)
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TL5209
500-mALOW-NOISELOW-DROPOUTVOLTAGEREGULATOR
WITHSHUTDOWN
SLVS581–SEPTEMBER2006
TYPICALCHARACTERISTICS(continued)
LINETRANSIENTRESPONSE
EnableVoltage(V)TURN-ONTIME
ChangeinOutputVoltage(mV)InputVoltage(V)20
4.53.5
COUT=2.2µFIL=500mA
20100-10
OutputVoltage(mV)210
COUT=1µFVIN= 3.5VILOAD= 10 mACIN=1µF
Time(500µs/div)
Time(50µs/div)
TURN-ONTIME
EnableVoltage(V)EnableVoltage(V)TURN-ONTIME
20
20
OutputVoltage(mV)10
OutputVoltage(mV)2210
COUT=1µFVIN= 3.5VILOAD= 500 mACIN=1µF
COUT=2.2µFVIN= 3.5VILOAD= 10 mACIN=1µF
Time(50µs/div)Time(50µs/div)
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TL5209
500-mALOW-NOISELOW-DROPOUTVOLTAGEREGULATORWITHSHUTDOWN
SLVS581–SEPTEMBER2006
www.ti.com
TYPICALCHARACTERISTICS(continued)
SHORT-CIRCUITCURRENT
vs
SUPPLYVOLTAGE
1000
COUT=2.2µFISC–Short-CircuitCurrentLimit–mA900
TURN-ONTIME
EnableVoltage(V)20
OutputVoltage(mV)210
800
COUT=2.2µFVIN= 3.5VILOAD= 500 mACIN=1µF
700
600
Time(50µs/div)
500
3
6
9
12
15
18
VCC–SupplyVoltage–V
SHORT-CIRCUITCURRENT
vsTIME
CIN= 1 µF
Short-CircuitCurrent–mA8006004002000
COUT= 4.7 µF
VIN= 3.5VVOUT= 0V
SHORT-CIRCUITCURRENT
vsTIME
CIN= 1 µF1000Short-CircuitCurrent–mA9008006004002000
COUT= 4.7 µFVIN= 16VVOUT= 0VTime – 25 ms/divTime – 10 ms/div
16
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TL5209
500-mALOW-NOISELOW-DROPOUTVOLTAGEREGULATOR
WITHSHUTDOWN
SLVS581–SEPTEMBER2006
TYPICALAPPLICATIONCIRCUITS
VIN = 3.3 V
1 µFINGNDOUT2.2 µFVOUT = 2.5 V ±1%
Figure5.Fixed2.5-VRegulator(TL5209-25,SOT-223)
VIN = 5 V
1 µFINENOUTBYP470 pFVOUT = 3.3 V ±1%2.2 µF
GNDFigure6.Fixed3.3-VLow-NoiseRegulator(TL5209-33,SOIC-8,orTO-263)
VIN
1 µFINENOUTR1GNDADJ/BYP470 pFR22.2 µFVOUT†
A.B.
VOUT=1.242V(1+R2/R1)
R2shouldbe≤470kΩforoptimalperformance.
Figure7.Low-NoiseAdjustableRegulator(TL5209,SOIC-8,orTO-263)
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500-mALOW-NOISELOW-DROPOUTVOLTAGEREGULATORWITHSHUTDOWN
SLVS581–SEPTEMBER2006
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APPLICATIONINFORMATION
Enable/Shutdown
TheenablefunctionisonlyavailableintheSOIC(D)andTO-263(KTT)packages.TheENpinisCMOS-logiccompatible.WhenENisheldhigh(>2V),theregulatorisactive.Likewise,applyingalowsignal(<0.4Vat25°C)toENorleavingitopenshutsdowntheregulator.Iftheenable/shutdownfeatureisnotneeded,ENshouldbetiedtoVIN.
InputCapacitor
Iftheinputoftheregulatorislocatedmorethanteninchesfromthepower-supplyfilter,orifabatteryisusedtopowertheregulator,aminimum1-µFinputcapacitorisrecommended.
OutputCapacitor
AswithallPNPregulators,anoutputcapacitorisneededforstability.Therequiredminimumsizeofthisoutputcapacitordependsonseveralfactors,oneofwhichiswhetherabypasscapacitorisused.•Withnobypasscapacitor,aminimumCOUTof1µFisrecommended.
•Withabypasscapacitorof470pF(seeFigure6),aminimumCOUTof2.2µFisrecommended.•LargervaluesofCOUTarebeneficial,becausetheyimprovetheregulatortransientresponse.
Anotherfactorthatcandeterminetheminimumsizeoftheoutputcapacitoristheloadcurrent.Atlowloads,asmalleroutputcapacitorisneededforstability.
Theequivalentseriesresistance(ESR)oftheoutputcapacitoralsocanaffectregulatorstability.COUTshouldhaveanESRof≈1Ω,anditshouldhavearesonantfrequencyabove1MHz.ToolowanESRcancausetheoutputtohavealow-amplitudeoscillationand/orunderdampedtransientresponse.Mosttantalumoraluminumelectrolyticcapacitorscanbeusedfortheoutputcapacitors.However,careshouldbeusedatlowtemperatures,becausealuminumelectrolyticsuseelectrolytesthatcanfreezeatlowtemperature(≈–30°C).Solidtantalumcapacitorsdonotexhibitthisproblemandshouldbeusedbelow–25°C.
BypassCapacitor
Anoptionalbypasscapacitor,CBYP,canbeexternallyconnectedtotheregulatorviatheBYPpinforimprovednoiseperformance(onlyforSOICandTO-263packages).Connectedtotheinternalvoltagedividerandtheerroramplifieroftheregulator,thisbypasscapacitorfiltersthenoiseoftheinternalreferenceandreducesthenoiseeffectsontheerroramplifier.Theoverallresultisasignificantdropinoutputnoiseoftheregulator.A470-pFbypasscapacitorisrecommended.
Addingabypasscapacitorhasseveraleffectsontheregulatorthatmustbetakenintoaccount.First,thebypasscapacitorreducesthephasemarginoftheregulatorand,thus,theminimumCOUTneedstobeincreasedto2.2µF,aspreviouslymentioned.Second,uponstartupoftheregulator,thebypasscapacitorhasaneffectontheregulatorturn-ontime.Ifaslowramp-upoftheoutputisneeded,largervaluesofCBYPshouldbeused.Conversely,ifafastramp-upoftheoutputisneeded,useasmallerCBYPornoneatall.Ifabypasscapacitorisnotneeded,BYPshouldbeleftopen.
Low-VoltageOperation
WhenusingtheTL5209-18andTL5209-25involtage-sensitiveapplications,specialconsiderationsarerequired.Ifappropriateoutputandbypasscapacitorsarenotchosenproperly,thesedevicesmayexperienceatemporaryovershootoftheirnominalvoltages.
Atstart-up,thefullinputvoltageisinitiallyappliedacrosstheregulatorpasstransistor,causingittobetemporarilyfullyturnedon.Bycontrast,theerroramplifierandvoltage-referencecircuits,beingpoweredfromtheoutput,arenotpoweredupasfast.Inordertoslowdowntheoutputrampandgivetheerroramplifiertimetorespond,selectlargervaluesofoutputandbypasscapacitors.Thelongerramptimeoftheoutputallowstheregulatorenoughtimetorespondandkeepstheoutputfromovershootingitsnominalvalue.
Topreventanovershootwhenstartingupintoalightload(≈100µA),4.7-µFand470-pFcapacitorsarerecommendedfortheoutputandbypasscapacitors,respectively.Athigherloads,10-µFand470-pFcapacitorsshouldbeused.
18
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TL5209
500-mALOW-NOISELOW-DROPOUTVOLTAGEREGULATOR
WITHSHUTDOWN
SLVS581–SEPTEMBER2006
APPLICATIONINFORMATION(continued)
Iftheapplicationisnottoosensitivetoregulatorovershoot,boththeoutputcapacitorandbypasscapacitor(ifapplicable)canbereduced.
AdjustableOutputVersion
Fortheadjustableversion,theoutputvoltageissetbytwoexternalresistorsformingavoltagedividerconnectedtotheoutputandtheADJpin(seeFigure7).VOUTissetbasedontheequation:VOUT=1.242V(1+R2/R1)
AlthoughADJrepresentsahigh-impedanceinput,limitR2to≤470kΩforoptimumperformance.
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PACKAGEOPTIONADDENDUM
www.ti.com
2-Nov-2006
PACKAGINGINFORMATION
OrderableDevice
TL5209DRTL5209DRG4
(1)
Status(1)ACTIVEACTIVE
PackageTypeSOICSOIC
PackageDrawing
DD
PinsPackageEcoPlan(2)
Qty88
2500Green(RoHS&
noSb/Br)2500Green(RoHS&
noSb/Br)
Lead/BallFinishCUNIPDAUCUNIPDAU
MSLPeakTemp(3)Level-1-260C-UNLIMLevel-1-260C-UNLIM
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.
Addendum-Page1
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