TPS61058DRCR

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TPS61058TPS61059

SLVS572B–APRIL2005–REVISEDDECEMBER2005

SYNCHRONOUSBOOSTCONVERTERWITHDOWNMODE

HIGHPOWERWHITELEDDRIVER

FEATURES

•

80%EfficientSynchronousBoostConverter–500-mALEDCurrentFrom3.3-VInput(TPS61058)

–800-mALEDCurrentFrom3.3-VInput(TPS61059)

InputVoltageRange:2.7Vto5.5V

FixedFrequency650kHz(Typ)OperationLEDDisconnectDuringShutdownOpen/ShortedLEDProtectionOver-TemperatureProtection

LowShutdownCurrent:100nA(Typ)TotalSolutionOfLessThan80mm2Small3mmx3mmQFN-10Package

DESCRIPTION

TheTPS61058/9devicesarefixedfrequency,synchronousboostdc-dcconverterswithanintegrateddownconversionmode.ThedevicesareoptimizedfordrivinghighpowersinglecellwhiteLEDsupto800mAfroma2.7-Vto5.5-Vinput.TheLEDcurrentcanbeprogrammedtodifferentlevels(e.g.torch,flashlight)byasetofexternalresistors.Theboostconverterisbasedona650frequency,pulse-width-modulation(PWM)usingasynchronousrectifiertoobtainefficiency.Themaximumpeakcurrentinswitchislimitedto1000mA(TPS61058)mA(TPS61059).

kHzfixedcontrollermaximumtheboostand1500

••••••••

APPLICATIONS

•

Torch/CameraWhiteLEDSupplyforCellPhones,Smart-PhonesandPDAs

Theconvertercanbedisabledtomaximizebatterylife.Intheshutdownmode,theloadiscompletelydisconnectedandthecurrentconsumptionisreducedtolessthan1µA.Built-inprechargeandsoft-startcircuitrypreventsexcessiveinrushcurrentduringstart-up.

Thedeviceispackagedina10-pinQFNPowerPAD™packagemeasuring3mmx3mm(DRC).

L12.7 V . . 5.5 VVIN

4.7 µHCIN22 µFTPS61058SWPVINVINFBVOUTC1, C2, C3R239 kΩR356 kΩRs1.5 Ω100D1LED Power Efficiency (PLED/PIN) - %22 µFx3C31 nF(COG)R122 kΩ9080706050403020100

2.703.10ILED= 500 mA@ VF= 3.7 VFLASH ON (0/1.8 V)ENGNDGNDIOKPGNDR55.6 kΩR462 kΩFigure1.500mAFlashlightApplication

3.503.904.304.70VI- Input Voltage - V

5.105.50Figure2.FlashlightEfficiencyvsVIN

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

PowerPADisatrademarkofTexasInstruments.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.ProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.Productionprocessingdoesnotnecessarilyincludetestingofallparameters.

Copyright©2005,TexasInstrumentsIncorporated

TPS61058TPS61059

SLVS572B–APRIL2005–REVISEDDECEMBER2005

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Thesedeviceshavelimitedbuilt-inESDprotection.TheleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoamduringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.

AVAILABLEOPTIONS

TA

-40°Cto85°C(1)(2)

CURRENTLIMIT

1000mA1500mA

PACKAGEMARKING

BNFBNG

PACKAGE10-PinQFN

PARTNUMBER(1)(2)

TPS61058DRCTPS61059DRC

TheDRCpackageisavailabletapedandreeled.AddRsuffixtodevicetype(e.g.TPS61058DRCR,TPS61059DRCR)toorderquantitiesof3000devicesperreel.

Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orseetheTIwebsiteatwww.ti.com.

ABSOLUTEMAXIMUMRATINGS

overoperatingfree-airtemperaturerange(unlessotherwisenoted)(1)

TPS61058/9

InputvoltagerangeonPVIN,VIN,EN,FB,IOK,SW,VOUTPowerdissipation

Operationtemperaturerange,TA

Maximumoperatingjunctiontemperature,TJ(max)Storagetemperaturerange,Tstg(1)

-0.3Vto7VInternallylimited-40°Cto85°C

150°C-65°Cto150°C

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

DISSIPATIONRATINGSTABLE

PACKAGEDRC

THERMALRESISTANCE

ΘJA

48.7°C/W

POWERRATING

TA≤25°C

2040mW

DERATINGFACTORABOVE

TA=25°C

21mW/°C

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TPS61058TPS61059

SLVS572B–APRIL2005–REVISEDDECEMBER2005

ELECTRICALCHARACTERISTICS

VIN=3.6V,ILED=500mA,EN=VIN,L=4.7µH,CO=3x22µF,TA=–40°Cto85°C,typicalvaluesareatTA=25°C(unlessotherwisenoted)

DC/DCSTAGE

PARAMETER

VINVOUTVOVPVFBfISW

Inputvoltagerange

TPS61058/9outputvoltagerangeOutputovervoltageprotectionTPS61058/9feedbackvoltageOscillatorfrequency

Switchcurrentlimit(TPS61058)Switchcurrentlimit(TPS61059)Pre-chargecurrent

rDS(on)

SWNswitchonresistanceSWPswitchonresistance

Totalaccuracy(includinglineandloadregulation)

IQI(SD)

QuiescentcurrentShutdowncurrentIOKswitchon-resistanceIOKoutputlowcurrentIOKoutputleakagecurrent

V(IL)V(IH)I(I)

ENlow-levelinputvoltageENhigh-levelinputvoltageENinputleakagecurrentENpull-downresistanceOvertemperatureprotectionOvertemperaturehysteresis

InputtiedtoGND

1.4

0.0140014020

0.1

VIOK=7V

ILED=0mA,VO=5.0V,Deviceswitchingat650kHzEN=GND,TA=25°CVO=5.0V,IIOK=100µA

0.6

VO=3.3VVO=3.3V

VO=2.5V,TA=-10°Cto85°CVO=3.3VVO=3.3V

-3%

5.50.10.81000.01

113000.10.4

TESTCONDITIONS

VO>2.0V@ILED=50mA

MIN2.72.55.9490550900120084

260290

3%

mAµAkΩµAµAVVµAkΩ°C°C

6.150065011001500TYP

MAX5.55.56.351075013001800

UNITVVVmVkHzmAmAmAmΩmΩ

CONTROLSTAGE

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SLVS572B–APRIL2005–REVISEDDECEMBER2005

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PINASSIGNMENTS

DRC Package(TOP VIEW)ENVOUTFBIOKGNDPGNDSWVINGNDPVINTerminalFunctions

TERMINALNAMEENVOUTFBIOKGNDPVINVINSWPGNDPowerPAD™

NO.12345,768910

IIII/OIOIO

DESCRIPTION

Thisistheenablepinofthedevice.Connectthispintogroundforcesthedeviceintoshutdownmode.Pullingthispinabove1.4Venablesthedevice.Thispinhasaninternalpull-downresistor.Thisistheoutputofthedc-dcconverter.

Thisisthefeedbackpinofthedevice.ThefeedbackpinmeasurestheLEDcurrentthroughthesenseresistor.Thefeedbackvoltageissetinternallyto500mV.

Thispinindicatesthatthedc-dcconverterisreadyforhighcurrentoperation(opendrainoutput).Control/logicground.

Thisistheinputvoltagepinofthedevice.Connectdirectlytotheinputbypasscapacitor.Thispinneedstobetiedtotheinputvoltagepinofthedevice.Thisistheswitchingpinoftheconverter.Powerground.

Mustbesolderedtoachieveappropriatepowerdissipation.ShouldbeconnectedtoPGND.

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TPS61058TPS61059

SLVS572B–APRIL2005–REVISEDDECEMBER2005

FUNCTIONALBLOCKDIAGRAM(TPS61058/9)

SWVINPVIN20 pFENVmaxcontrol10 kWGateControlPGNDVOUT

PGNDRegulatorError-AmplifierPGNDFB

VrefOVPVrefOscillatorControl LogicEN400 kWTemperatureControlIOKGNDGND

5

TPS61058TPS61059

SLVS572B–APRIL2005–REVISEDDECEMBER2005

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PARAMETERMEASUREMENTINFORMATION

L12.7 V . . 5.5 V4.7mFCIN22mFTPS61058/9SWPVINVINFBC31 nF (COG)R122 kWR3RsVOUTC1, C2, C322mFx3R2D1VIN

TORCH ON (0/1.8 V)ENGNDGNDIOKPGNDR6R5C4(Optional)R4FLASH(0 . .2 V)List of Components:

L1 = TDK VLF5014AT-4R7T

C1,C2,C3 = TDK C2012X5R0J226MTJ

500 mAFlashlightApplication

Rs = 1.3WR2 = 56 kWR3 = 100 kWR4 = 2.4 kWR5 = 6.2 kWR6 = 91 kW

700 mAFlashlightApplication

Rs = 1.2WR2 = 47 kWR3 = 51 kWR4 = 3.3 kWR5 = 4.3 kWR6 = 120 kW

C4 = 100 nF

TYPICALCHARACTERISTICS

TableofGraphs

FIGURE

(TPS61058)LEDPowerEfficiency(TPS61059)LEDPowerEfficiency(TPS61058)LEDPowerEfficiency(TPS61058)DCInputCurrent(TPS61058)LEDCurrentOscillatorFrequency(TPS61059)CurrentLimitWaveforms

vs.Temperature

SwitchingWaveformsinBoostMode(TPS61058)SwitchingWaveformsinDown-Mode(TPS61058)HighCurrentFlashlightPulseWaveform(TPS61058)TorchtoFlashlightTransistion(TPS61058)Start-UpAfterEnable(TPS61058)OvervoltageProtection(TPS61058)DutyCycleJitter(TPS61058)vs.InputVoltagevs.InputVoltagevsLEDCurrentvs.InputVoltagevs.InputVoltage

345678910111213141516

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TPS61058TPS61059

SLVS572B–APRIL2005–REVISEDDECEMBER2005

TPS61058

LEDPOWEREFFICIENCY

vs

INPUTVOLTAGE

10090LEDPowerEfficiency(PLED/PIN)-%TPS61059

LEDPOWEREFFICIENCY

vs

INPUTVOLTAGE

100ILED = 150 mA @ VF = 3.0 VILED= 150 mA@ VF= 3.4 V807060504030201002.703.103.503.904.304.705.105.50ILED= 500 mA@ VF= 3.7 VLED Power Efficiency (PLED/PIN)− %90807060504030201002.70

ILED = 700 mA @ VF = 3.4 VVI- Input Voltage - V

3.103.503.904.304.705.105.50

VI − Input Voltage − V

Figure3.TPS61058EFFICIENCY

vs

LEDCURRENT

10090

1200

80

1400

Figure4.

TPS61058

DCINPUTCURRENT

vs

INPUTVOLTAGE

Input DC Current - mA706050403020

1000800600400

ILED= 500 mA200

10010015020025030035040045050002.703.103.503.904.304.70VI- Input Voltage - V

5.105.50LED Current - mA

Figure5.Figure6.

7

TPS61058TPS61059

SLVS572B–APRIL2005–REVISEDDECEMBER2005

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TPS61058LEDCURRENT

vs

INPUTVOLTAGE

600ILED= 500 mA500OSCILLATORFREQUENCY

16141210864TA = 255CLED Current - mA400300200ILED= 150 mA100Percent of Units − %202.70

3.10

3.503.904.304.70VI- Input Voltage - V

5.10

5.50

0606615622629636643650657664f − Oscillator Frequency − kHz

672Figure7.TPS61059CURRENTLIMIT

vs

TEMPERATURE

1750

Figure8.

TPS61058

SWITCHINGWAVEFORMSINBOOSTMODE

VI= 3.6 V, ILED= 500 mA

Switch Current Limit−mA1650

SW (2 V/div)

1550

IL(200 mA/div)

1450

ILED(200 mA/div)

1350

1250

-40-30-20-1001020304050607080VOUT(10 mV/div - 3.8 V OFFSET)

t - Time - 500 ns/divAmbient Temperature−C

Figure9.Figure10.

8

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TPS61058TPS61059

SLVS572B–APRIL2005–REVISEDDECEMBER2005

TPS61058

SWITCHINGWAVEFORMSINDOWNMODETPS61058

HIGHCURRENTFLASHLIGHTPULSEWAVEFORM

EN (1 V/div)

SW(2 V/div)VOUT(1 V/div)

IL(200mA/div)IL(200 mA/div)

ILED(200mA/div)

ILED(200 mA/div)

VOUT

(10 mV/div - 3.8 V OFFSET)

VI= 4.5 V, ILED= 500 mA

VI= 3.6 V

t - Time - 5 ms/div

t - Time - 500 ns/divFigure11.

TPS61058

TORCHTOFLASHLIGHTTRANSISTION

Figure12.

TPS61058

START-UPAFTERENABLE

VOUT(1 V/div)

EN (1 V/div)VOUT(1 V/div)IL(500 mA/div)

ILED(50 mA/div)ILED(200 mA/div)

IL(100 mA/div)t - Time - 50ms/divt - Time - 200ms/divFigure14.

Figure13.

9

TPS61058TPS61059

SLVS572B–APRIL2005–REVISEDDECEMBER2005

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TPS61058

OVERVOLTAGEPROTECTION

VOUT(200 mV/div - 5 V OFFSET)TPS61058

DUTYCYCLEJITTER

SW (2 V/div)

VI= 3.6 VILED= 500 mA

Triggered On Falling Edget - Time - 50 ms/divt - Time - 50 ns/div

Figure15.Figure16.

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TPS61058TPS61059

SLVS572B–APRIL2005–REVISEDDECEMBER2005

DETAILEDDESCRIPTION

OPERATION

TheTPS61058/9famillyisbasedonafixedfrequencymultiplefeedforwardcontrollertopology.Inputvoltage,outputvoltage,andvoltagedropontheNMOSswitcharemonitoredandforwardedtotheregulator.Sochangesintheoperatingconditionsoftheconverterdirectlyaffectthedutycycleandmustnottaketheindirectandslowwaythroughthecontrolloopandtheerroramplifier.

Thecontrolloop,determinedbytheerroramplifier,onlyhastohandlesmallsignalerrors.TheinputforitisthefeedbackvoltageontheFBpin.ItiscomparedwiththeinternalreferencevoltagetogenerateanaccurateandstableLEDcurrent.

ThepeakcurrentoftheNMOSswitchisalsosensedtolimitthemaximumcurrentflowingthroughtheswitchandtheinductor.Thetypicalpeakcurrentlimitissetto1000mA(TPS61058)and1500mA(TPS61059).Aninternaltemperaturesensorpreventsthedevicefromgettingoverheatedincaseofexcessivepowerdissipation.SynchronousRectifier

ThedeviceintegratesanN-channelandaP-channelMOSFETtransistortorealizeasynchronousrectifier.BecausethecommonlyuseddiscreteSchottkyrectifierisreplacedwithalowRDS(ON)PMOSswitch,thepowerconversionstageitselfcanreach96%efficiency.

InordertoavoidgroundshiftduetothehighcurrentsintheNMOSswitch,twoseparategroundpinsareused.ThereferenceforallcontrolfunctionsistheGNDpin.ThesourceoftheNMOSswitchisconnectedtoPGND.BothgroundsmustbeconnectedonthePCBatonlyonepointclosetotheGNDpin.

Aspecialcircuitisappliedtodisconnecttheloadfromtheinputduringshutdownoftheconverter.Inconventionalsynchronousrectifiercircuits,thebackgatediodeofthehigh-sidePMOSisforwardbiasedinshutdownandallowscurrentflowfromthebatterytotheoutput.Thisdevicehoweverusesaspecialcircuitwhichtakesthecathodeofthebackgatediodeofthehigh-sidePMOSanddisconnectsitfromthesourcewhentheregulatorisnotenabled(EN=Low).

Thebenefitofthisfeatureforthesystemdesignengineeristhatthebatteryisnotdepletedduringshutdownoftheconverter.Noadditionalcomponentshavetobeaddedtothedesigntomakesurethatthebatteryisdisconnectedfromtheoutputoftheconverter.DownRegulation

Ingeneral,aboostconverteronlyregulatesoutputvoltageswhicharehigherthantheinputvoltage.ThisdeviceoperatesdifferentlyandiscapableofdrivinghighpowersinglediewhiteLEDsfromafullychargedLi-Ioncell.Tocontrolthisapplicationsproperly,adownconversionmodeisimplemented.

IftheinputvoltagereachesorexceedstheoutputvoltagenecessarytomaintaintheLEDcurrentwithinregulation,theconverterchangestoadownconversionmode.Inthismode,thecontrolcircuitchangesthebehavioroftherectifyingPMOStransitor.ItsetsthevoltagedropacrossthePMOSashighasneededtoregulatetheoutputvoltage.Thismeansthepowerlossesintheconverterincrease.ThishastobetakenintoaccountforthermalconsiderationespeciallywhenoperatingwithlowVFLEDs,highbatteryvoltagesandhighLEDcurrents.Enable

ThedeviceisputintooperationwhenENissethigh.ItisputintoashutdownmodewhenENissettoGND.TheENinputpinhasaninternal400-kΩpull-downresistortodisablethedevicewhenthispinisfloating.

Inshutdownmode,theregulatorstopsswitching,theinternalcontrolcircuitryisswitchedoff,andtheloadisisolatedfromtheinput(asdescribedintheSynchronousRectifierSection).Thisalsomeansthattheoutputvoltagecandropbelowtheinputvoltageduringshutdown.

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DETAILEDDESCRIPTION(continued)

Softstart

Toavoidhighinrushcurrentduringstart-up,specialcareistakentocontroltheinrushcurrent.Whenthedeviceisfirstenabled,theoutputcapacitorischargedwithaconstantpre-chargecurrentof115mA(typ)untileithertheoutputvoltageistypically0.1Vbelowtheinputvoltageorthefeedbackvoltageis500mV(typ).Therectifyingswitchiscurrentlimitedduringthepre-chargephase.Thisalsolimitstheoutputcurrentundershortcircuitconditionsattheoutput.

Thefixedpre-chargecurrentduringstart-upallowsthedevicetostartupwithoutproblemswhendrivingsinglediewhiteLEDsaslongastheLEDstart-upcurrentissettoavaluelowerthanthepre-chargecurrent(84mAmin.).Refertotheapplicationsectionformoredetails.

Whenthedevicehasfinishedstart-upandisreadyforhighcurrentoperation,thedeviceforcesIOKoutputtoground,startsswitchingandregulatestheLEDcurrenttothedesiredvalue(e.g.torchorflashlightcurrentlevel).OvervoltageProtection(OVP)

Aswithanycurrentsource,theoutputvoltageriseswhentheloadbecomeshighimpedanceorgetsdisconnected.Topreventtheoutputvoltageexceedingthemaximumswitchvoltagerating(7V)ofthemainswitch,anovervoltageprotectioncircuitisintegrated.AssoonastheoutputvoltageexceedstheOVPthreshold,theconverterstopsswitchingandtheoutputvoltagedecreases.WhentheoutputvoltagefallsbelowtheOVPthreshold,theconvertercontinuesoperationuntiltheoutputvoltageexceedstheOVPthresholdagain.EfficiencyandSenseVoltage

Thevoltageacrossthesenseresistor(RS)hasadirecteffectoftheconverterefficiency.Becausethesensevoltagedoesnotcontributetotheoutputpower(PLED),thelowerthisvoltagethehighertheefficiency.Itisthereforerecommendedtooperatewithasensevoltageofapproximately0.75VatmaximumLEDcurrent.ThermalShutdown

AninternalthermalshutdownisimplementedandturnsofftheinternalMOSFETswhenthetypicaljunctiontemperatureof140°Cisexceeded.Thethermalshutdownhasahysteresisoftypically20°C.RefertotheThermalInformationsection.

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APPLICATIONINFORMATION

DESIGNPROCEDURE

Thestandardapplicationcircuit(Figure17)oftheTPS61058/9isacompletesolutiontodrivehigh-powerwhiteLEDswithtwodiscretecurrentsteps.L12.7 V . . 5.5 VVIN

4.7 µHCIN22 µFFBTPS61058/9SWPVINVINVOUTC1, C2, C322 µFx3R2C4R122 kΩMOVIE-LIGHTENIOKR6C5R5GNDGND100nFMOVIE-LIGHT

D1nFLASH

VSENSE1 nF (COG)R3RsIOKHi-ZMovie-LightHi-ZFlashlightVxR4PGNDILEDPre-ChargenFLASHFigure17.TypicalApplication

Figure18.WaveformProfiles

TheLEDcurrentisprogrammedusingexternalresistors(RS,R2,R3,R4,R5,andR6).ThefirststeptoturnontheLEDistoenablethedevice(EN=High).Afterchargingtheoutputcapacitor,thedeviceforcesIOKtoground,startsswitching,andregulatestheLEDcurrenttothedesiredvalue.Thecontrolsignal,nFLASH,injectscurrentintothefeedbacknetworkthroughR4,thereby,changingtheLEDcurrent.Forthisreason,thenFLASHcontrolsignalneedsatleasttobebiasedupuntilIOKgoeslow.Incasethisisnotdoneproperlytheconverterstaysstuckinthepre-chagephase.

Tofaciliatethesizingoftheexternalresistornetwork,itisrecommendedtousethecalculationsheetavailableinthedeviceproductfolder.1.Senseresistor,RS

Thevoltageacrossthesenseresistorshouldbesettoapproximately0.75VatmaximumLEDcurrent.V

R+SENSESI

LED

Checkthepowerratingofthesenseresistor(PD=RS×ILED2).2.LEDcurrentsetting

Figure19showsanequivalentcircuitforthefeedbacknetwork.Theregulationloopisusinganexternalcontrolvoltage(nFLASH)tosettheLEDcurrent.Withthehelpofthisvoltagethefeedbackbiascurrent(IBIAS)canbeadjustedwhich,ineffect,controlstheLEDcurrentwithoutchanginganyexternals.

InmostapplicationsavariablecontrolvoltageisnotavailabletosettheLEDcurrent.Inpracticalapplications,nFLASHcaneitherbe:

Aconstantbiasvoltage(2.8Vforexample)whichincombinationwithIOKcanbeusedtoswitchbetweentwoLEDcurrents(Off,Flashlight).

Alogicsignalgeneratedbytheimagingprocessor.ThisconfigurationpermitsthreedifferentLEDcurrents:Off,Movie-light(nFLASH=High),Flashlight(nFLASH=Low).

(1)

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Thecircuitoperationcanbesplitintodifferentphases:1.Pre-ChargePhase(IOK=Hi-Z)

DuringthisphaseIOKiskepthigh-impedance.ForproperstartuptheexternalloopcomponentsneedtobechosensothattheregulationloopcansettleforamaximumLEDcurrentoflessthan84mA.Thiscanbeachievedbyincreasingthebiasvoltage(VX)ofthefeedbacknetwork.

0.5*R2 I

ILED

+

R

ǒ

BIAS

Ǔ

SR5I[nFLASH*0.5,assumingR4ńńR5issmallcomparedR3.

BIASR3 (R4)R5)R3

(2)(3)

2.High-CurrentOperation(IOK=GND)

Afterthepre-chargephase,IOKisautomaticallypulledtoground.ThismodifiesthefeedbackdividernetworkchangingthepotentialoftheVXnode.AsaconsequencetheLEDcurrentisadjustedaccordingly.

1R2R2)*Vx

LEDR2 R2 R3 RR3 R

SSSSR5ȀI[nFLASH*0.5,withR5Ȁ+R5 R6

BIAS2R3 (R4)R5Ȁ)R3R5)R6I

+

[

0.5*R2 I

ǒ

BIAS2

Ǔ

(4)(5)

ForoperationatmaximumLEDcurrent(flashlightmode),nFLASHneedstobesettogroundlevel.I[R2)R3,assumingR4ńńR5ńńR6issmallcomparedR3.LED(FLASH)2 R3 R

S

(6)

ForoperationatotherLEDcurrents(movie-lightorpre-charge),nFLASHappliesapositivebiasvoltage(1.8Vforexample)tothefeedbackdividernetwork.ThefollowingequationsshowtherelationshipbetweenLEDcurrentandbiasvoltageVx.

R3)R

R3S1Vx[)*I

LED(MOVIE*LIGHT,PRE*CHARGE)22 R2R2(7)

Vx[

R5ȀnFLASH,withR5Ȁ+R5 R6

R4)R5ȀR5)R6

(8)

Forstableoperation,itisrecommendedthatR3besetintherangeof50kΩto150kΩandR5intherangeof3.3kΩto10kΩ.Bestperformanceisobtainedwithapre-chargecurrentof45mAtyp.

Forsinglecurrentlevelapplications(e.g.torchorflashlightonly)itisrecommendedtooperatewithR4intherangeof50kΩto200kΩ.InthatcaseR5isnotneedanymore.

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TPS61058TPS61059

SLVS572B–APRIL2005–REVISEDDECEMBER2005

Thefollowingexampleisusedtoexplaintheproceduretosizetheexternalcomponentsforagivensetofrequirements:

•Movie-lightmode:ILED=150mA•Flashlightmode:ILED=500mA

•LEDforwardvoltage:VF(MAX)=4.4Vat500mA

•nFLASHsignalis1.8Vlogiccompliant(0Vand1.8V±4%)

Step1–CurrentSenseResistorCalculation–RS

V

R+SENSE+0.75+1.5WV+4.4)0.75+5.15VSOUT(MAX)0.5I

LEDStep2–FeedbackDividerResistorCalculation–R2,R3

I

LED(FLASH)

[

R2)R32 R3 R

S

R3+100kW(recommendedvalue)R2+47kW(calculated)

(9)

(10)

Step3–BiasResistorNetworkCalculation–R4,R5,R6

Vx[1)R3*I

LED22 R2

R3 RR2

S

V+1.1V@I+150mA(movie−light)

XLEDV+1.4V@I+45mA(pre−load)XLED

(11)

Duringthepre-chargephase,IOKishighimpedance.R5+0.78R4)R5

R5Vx[nFLASHR4)R5R5+10kW(recommendedvalue)

R4+2.7kW(calculated)Inmovie-lightmode,IOKisgrounded.

Vx[

R5ȀnFLASHR4)R5Ȁ

R5Ȁ+0.61,R5Ȁ+1.57 R4,R5Ȁ+R5 R6R4)R5ȀR5)R6R6+7.5kW(calculated)

(12)

(13)

FB = 500 mVILED

R2VSENSERS

R3IOKM1R5R4R6IBIASVXnFLASHFigure19.FeedbackNetworkEquivalentCircuit

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INDUCTORSELECTION

Aboostconverternormallyrequirestwomainpassivecomponentsforstoringenergyduringtheconversion.Aboostinductorandastoragecapacitorattheoutputarerequired.Toselecttheboostinductor,itisrecommendedtokeepthepossiblepeakinductorcurrentbelowthecurrentlimitthresholdofthepowerswitchinthechosenconfiguration.Forexample,thecurrentlimitthresholdoftheTPS61059switchis1700mAatanoutputvoltageof5V.Thehighestpeakcurrentthroughtheinductorandtheswitchdependsontheoutputload,theinputvoltageandtheoutputvoltage.EstimationofthemaximumaverageinductorcurrentcanbedoneusingEquation14:V

OUTI+I

LOUTV 0.8

IN(14)

V+V)R IOUTF(LED)SLED(15)Forexample,foranoutputcurrentof500mAat4.5V,atleast800mAofaveragecurrentflowsthroughtheinductorataminimuminputvoltageof3.3V.

Thesecondparameterforchoosingtheinductoristhedesiredcurrentrippleintheinductor.Inordertooptimizedthesolutionsize,inductorripplecurrentsashighas40%oftheaverageinductorcurrentcanbetolerated.Asmallerripplereducesthemagnetichysteresislossesintheinductor,aswellasoutputvoltagerippleandEMI.Withthoseparameters,itispossibletocalculatethevaluefortheinductorbyusingEquation16: V*VINOUTINL+

DI ƒ VLOUT

V

ǒǓ

(16)

Parameterfistheswitchingfrequencyand∆IListheripplecurrentintheinductor,i.e.,40%×IL.Inthisexample,

thedesiredinductorhasthevalueof4.5µH.Withthiscalculatedvalueandthecalculatedcurrents,itispossibletochooseasuitableinductor.IntypicalhighcurrentwhiteLEDapplicationsa4.7µHinductanceisrecommended.CarehastobetakenthatloadtransientsandlossesinthecircuitcanleadtohighercurrentsasestimatedinEquation16.Also,thelossesintheinductorcausedbymagnetichysteresislossesandcopperlossesareamajorparameterfortotalcircuitefficiency.

ThefollowinginductorseriesfromdifferentsuppliershavebeenusedwiththeTPS61058/9converters:

Table1.ListofInductors

MANUFACTURERCOILCRAFT

TDKTAIYOYUDEN

SERIESLPS3015VLF3014ATVLF5014ATNP04SZB

DIMENSIONS

3mmx3mmx1.5mmmax.height2.6mmx2.8mmx1.4mmmax.height4.5mmx4.7mmx1.4mmmax.height5mmx5mmx2.0mmmax.height

REMARKSTPS61058TPS61058TPS61059TPS61059

16

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TPS61058TPS61059

SLVS572B–APRIL2005–REVISEDDECEMBER2005

CAPACITORSELECTION

InputCapacitor

ForgoodinputvoltagefilteringlowESRceramiccapacitorsarerecommended.Atleasta10-µFinputcapacitorisrecommendedtoimprovetransientbehavioroftheregulatorandEMIbehaviorofthetotalpowersupplycircuit.Theinputcapacitorshouldbeplacedascloseaspossibletotheinputpinoftheconverter.OutputCapacitor

Themajorparameternecessarytodefinetheoutputcapacitoristhemaximumallowedoutputvoltagerippleoftheconverter.Thisrippleisdeterminedbytwoparametersofthecapacitor,thecapacitanceandtheESR.Itispossibletocalculatetheminimumcapacitanceneededforthedefinedripple,supposingthattheESRiszero,byusingEquation17: V*VOUTOUTIN

C+minƒ DV V

OUT

I

ǒǓ

(17)

Parameterfistheswitchingfrequencyand∆Visthemaximumallowedripple.

Withachosenripplevoltageof10mV,aminimumcapacitanceof22µFisneeded.ThetotalrippleislargerduetotheESRoftheoutputcapacitor.ThisadditionalcomponentoftheripplecanbecalculatedusingEquation18:DV+I RESROUTESR(18)ThetotalrippleisthesumoftheripplecausedbythecapacitanceandtheripplecausedbytheESRofthecapacitor.Additionalrippleiscausedbyloadtransients.Thismeansthattheoutputcapacitorhastocompletelysupplytheloadduringthechargingphaseoftheinductor.Areasonablevalueoftheoutputcapacitancedependsonthespeedoftheloadtransientsandtheloadcurrentduringtheloadchange.

ForthehighcurrentwhiteLEDapplication,aminimumof20µFeffectiveoutputcapacitanceisusuallyrequiredwhenoperatingwith4.7µH(typ)inductors.Forsolutionsizereasons,thisisusuallyoneormoreX5R/X7Rceramiccapacitors.Inordertomaintainthecontrolloopstable,theadditionofacompensationnetworkformedbyR1(22kΩ)andC3(1nFCOG)isnecessary.

CHECKINGLOOPSTABILITY

Thefirststepofcircuitandstabilityevaluationistolookfromasteady-stateperspectiveatthefollowingsignals:•Switchingnode,SW•Inductorcurrent,IL

•Outputripplevoltage,VOUT(AC)

Thesearethebasicsignalsthatneedtobemeasuredwhenevaluatingaswitchingconverter.Whentheswitchingwaveformshowslargedutycyclejitterortheoutputvoltageorinductorcurrentshowsoscillations,theregulationloopmaybeunstable.Thisisoftenaresultofboardlayoutand/orL-Ccombination.

Asanextstepintheevaluationoftheregulationloop,theloadtransientresponseistested.VOUTcanbemonitoredforsettlingtime,overshootorringingthathelpsjudgetheconverter'sstability.Withoutanyringing,theloophasusuallymorethan45°ofphasemargin.

Becausethedampingfactorofthecircuitryisdirectlyrelatedtoseveralresistiveparameters(e.g.,MOSFETrDS(on))thataretemperaturedependant,theloopstabilityanalysishastobedoneovertheinputvoltagerange,LEDcurrentrange,andtemperaturerange.

17

TPS61058TPS61059

SLVS572B–APRIL2005–REVISEDDECEMBER2005

www.ti.com

LAYOUTCONSIDERATIONS

Asforallswitchingpowersupplies,thelayoutisanimportantstepinthedesign,especiallyathighpeakcurrentsandhighswitchingfrequencies.Ifthelayoutisnotcarefullydone,theregulatorcouldshowstabilityproblemsaswellasEMIproblems.Therefore,usewideandshorttracesforthemaincurrentpathandforthepowergroundtracks.

Theinputcapacitor,outputcapacitor,andtheinductorshouldbeplacedascloseaspossibletotheIC.Useacommongroundnodeforpowergroundandadifferentoneforcontrolgroundtominimizetheeffectsofgroundnoise.ConnectthesegroundnodesatanyplaceclosetooneofthegroundpinsoftheIC.

ThecompensationnetworkaswellasthecurrentsettingresistorsshouldbeplacedascloseaspossibletothecontrolgroundpinoftheIC.Tolayoutthecontrolground,itisrecommendedtouseshorttracesaswell,separatedfromthepowergroundtraces.Thisavoidsgroundshiftproblems,whichcanoccurduetosuperimpositionofpowergroundcurrentandcontrolgroundcurrent.

Figure20.SuggestedLayout–TopSide

Figure21.SuggestedLayout–BottomSide

18

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TPS61058TPS61059

SLVS572B–APRIL2005–REVISEDDECEMBER2005

APPLICATIONEXAMPLES

L14.7 mH2.7 V . . 5.5 VVIN

CIN22 mFSWPVINVINFBC31 nF(COG)R122 kWFLASH ON (0/1.8 V)ENGNDGNDIOK5.6 kWPGNDR468 kWR6R356 kWTPS61058VOUTC1, C2, C322mFx3D1R239 kWRs1.5 WList of Components:

L1 = COILCRAFT LPS3015−4R7

C1,C2, C3 = TDK C2012X5R0J226MTJ

Figure22.500mAFlashlightApplication-1.8VLogic

L12.7 V . . 5.5 VVIN

4.7 mHCIN22 mFFBTPS61059SWPVINVINVOUTC1, C2, C322 mFx3R2C41nF (COG)R122 kWMOVIE−LIGHT (0/2.8V)ENR6IOK10 kWR54.7 kWPGNDC5100 nFR43.9 kW33 kWR375 kWRs1.2 WD1GNDGNDnFLASH (0/2.8V)List of Components:

L1 = TDK VLF5014AT−4R7

C1,C2, C3 = TDK C2012X5R0J226MTJ

MOVIE−LIGHT

0011

nFLASH

0101

ILEDOFFOFF

FLASHLIGHTMOVIE−LIGHT

Note: Before turning into the flashlight mode, thedevice to be driven into movie−light mode. See theDesign Procedure section for more details.

Figure23.150mAMovie-Light/600mAFlashlightApplication-2.8VLogic

19

TPS61058TPS61059

SLVS572B–APRIL2005–REVISEDDECEMBER2005

www.ti.com

L12.7 V . . 5.5 VVIN

4.7 mHCIN22 mFTPS61058SWPVINVINVOUTC1, C2, C322 mFx3FBR2C41nF (COG)R122 kW39 kWR351 kWRs1.5 W

D1FLASH ON (0/2.8V)ENIOKR610 kWR4150 kWPGNDGNDGNDList of Components:

L1 = COILCRAFT LPS3015−4R7

C1,C2, C3 = TDK C2012X5R0J226MTJ

Figure24.500mAFlashlightApplication-2.8VLogic

L12.7 V . . 5.5 VVIN

4.7 mHCIN22 mFFBC41nF (COG)R122 kWMOVIE−LIGHT (0/1.8 V)ENIOKR612 kWR56.8 kWGNDGNDPGNDC5100nFR43.6 kWTPS61059SWPVINVINVOUTC1, C2, C322 mFx3R268 kWR3100 kWRs1.2 WD1TX−TOFF (0/1.8 V)n FLASH (0/1.8 V)List of Components:

L1 = TDK VLF5014AT−4R7

C1,C2, C3 = TDK C2012X5R0J226MTJ

1V8LVC1G32Figure25.150mAMovie-Light/700mAFlashlightwithNo-LatencyCurrentReduction

20

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TPS61058TPS61059

SLVS572B–APRIL2005–REVISEDDECEMBER2005

L12.7 V . . 5.5 VVIN

4.7 mHCIN22 mFTPS61059SWPVINVINVOUTC1, C2, C322 mFx3FBR4C31nF (COG)R122 kW75 kWR575 kWV1R12.0 WD1R3D2V2R22.0 W

75 kWFLASH ON (0/2.8V)ENIOKR75.1 kWC5100 nFPGNDR6110 kWGNDGNDList of Components:

L1 = TDK VLF5014AT−4R7

C1,C2, C3 = TDK C2012X5R0J226MTJ

Figure26.2x350mAFlashlightApplication-2.8VLogic

21

TPS61058TPS61059

SLVS572B–APRIL2005–REVISEDDECEMBER2005

www.ti.com

THERMALINFORMATION

Implementationofintegratedcircuitsinlow-profileandfine-pitchsurface-mountpackagestypicallyrequiresspecialattentiontopowerdissipation.Manysystem-dependentissuessuchasthermalcoupling,airflow,addedheatsinksandconvectionsurfaces,andthepresenceofotherheat-generatingcomponentsaffectthepower-dissipationlimitsofagivencomponent.

Threebasicapproachesforenhancingthermalperformancearelistedbelow.•ImprovingthepowerdissipationcapabilityofthePCBdesign•ImprovingthethermalcouplingofthecomponenttothePCB•Introducingairflowinthesystem

Themaximumrecommendedjunctiontemperature(TJ)oftheTPS61058/9devicesis125°C.Thethermalresistanceofthe10-pinQFN3x3package(DRC)isRθJA=48.7°C/W,ifthePowerPADissoldered.SpecifiedregulatoroperationisassuredtoamaximumambienttemperatureTAof85°C.Therefore,themaximumpowerdissipationisabout820mW.Morepowercanbedissipatedifthemaximumambienttemperatureoftheapplicationislower.

T*TJ(MAX)A

P++125°C*85°C+820mWD(MAX)R48.7°CńWqJA(19)

22

PACKAGEOPTIONADDENDUM

www.ti.com

5-Feb-2007

PACKAGINGINFORMATION

OrderableDeviceTPS61058DRCRTPS61058DRCRG4TPS61059DRCRTPS61059DRCRG4TPS61059DRCTTPS61059DRCTG4

(1)

Status(1)ACTIVEACTIVEACTIVEACTIVEACTIVEACTIVE

PackageTypeSONSONSONSONSONSON

PackageDrawingDRCDRCDRCDRCDRCDRC

PinsPackageEcoPlan(2)

Qty101010101010

3000Green(RoHS&

noSb/Br)3000Green(RoHS&

noSb/Br)3000Green(RoHS&

noSb/Br)3000Green(RoHS&

noSb/Br)250250

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

Lead/BallFinishCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAUCUNIPDAU

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

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

PACKAGEMATERIALSINFORMATION

www.ti.com

11-Mar-2008

TAPEANDREELINFORMATION

*Alldimensionsarenominal

Device

PackagePackagePinsTypeDrawingSONSONSON

DRCDRCDRC

101010

SPQ

ReelReelDiameterWidth(mm)W1(mm)330.0330.0180.0

12.412.412.4

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

P1(mm)8.08.08.0

WPin1(mm)Quadrant12.012.012.0

Q2Q2Q2

TPS61058DRCRTPS61059DRCRTPS61059DRCT

30003000250

3.33.33.3

3.33.33.3

1.11.11.1

PackMaterials-Page1

PACKAGEMATERIALSINFORMATION

www.ti.com

11-Mar-2008

*Alldimensionsarenominal

DeviceTPS61058DRCRTPS61059DRCRTPS61059DRCT

PackageType

SONSONSON

PackageDrawing

DRCDRCDRC

Pins101010

SPQ30003000250

Length(mm)

346.0346.0190.5

Width(mm)346.0346.0212.7

Height(mm)

29.029.031.8

PackMaterials-Page2

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