LM3520IntegratedWhiteLEDDriverwithOrganicLEDDisplayPowerSupplySeptember2005
LM3520
IntegratedWhiteLEDDriverwithOrganicLEDDisplayPowerSupply
GeneralDescription
TheLM3520isadualstep-upDC/DCconverter,designedtodriveupto5whiteLEDswithaconstantcurrentandtopoweranorganicLEDdisplaywithaconstantvoltage.
AsingleexternalresistorisusedtosetthemaximumLEDcurrent.TheLEDcurrentcanbeadjustedbyapplyingaPWMsignaltotheENpin.ForhigherefficiencytheLM3520operateswithpulsefrequencymodulation(PFM)controlschemewhenthesub-displayisenabled.WhenMaindis-playisenabled,thedeviceisoperatinginPWMmode.
Overvoltageprotectioncircuitryanda1MHzswitchingfre-quencyallowfortheuseofsmall,lowcostexternalcompo-nents.
Additionalfeaturesincludealow-sideNFETswitchthatcanturnofftheLEDstringwithnoDCcurrentpathtoground.TheLM3520isavailableinasmall14-pinthermally-enchancedLLPpackage.
Features
nIntegratedOLEDandwhite-LEDdrivern80%efficiency
nDrivesupto5LEDsat20mA/3.6Vand4LEDsat30mA/3.6Vformain-display
nUpto20V@50mA/3.6Vforsub-displaynTrueshutdownisolationnSmallExternalComponentsn1MHzSwitchingFrequencyn23VOverVoltageProtection
nWideInputVoltageRange:2.7Vto5.5VnCycle-By-CycleCurrentLimitnPWMDimmingControl
nLowProfile14-PinLLP(3mmx4mmx0.8mm)
Applications
nnnnn
Flip-phones/Clam-shellCellularPhonesHandheldDevices
High-fashioncellularphonesWhiteLEDBacklightingDigitalCameras
TypicalApplications
20128803
MainDisplaywithOLEDSubDisplay
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LM3520FunctionalBlockDiagram
20128802
FIGURE1.FunctionalBlockDiagram
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LM3520PinDescriptions
Pin#1234567891011121314
PinNameVSWVINAGNDNCMAIN_ENSUB_ENPFM_ENSUB_FBVSUBVO_MAINMAIN_FBMAIN_RTNDGNDNC
SwitchingVoltageInputVoltageAnalogGroundNoConnectMainEnableSubDisplayEnable
PFMmode:OLEDsub-display,pinmustbetiedtoSUB_ENSubDisplayFeedback
SubDisplayPowerSupplyVoltageMainOutputVoltageMainDisplayFeedbackMainDisplayReturnVoltageDigitalGroundNoConnect
Description
OrderingInformation
OrderNumberLM3520SDLM3520SDX
PackageLLP-14
NSCPackageMarkingL133BL133B
SuppliedAs
1000units,TapeandReel4500units,TapeandReel
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LM3520OperationModes
LM3520hastwooperatingmodes;Figure2showsmaindisplayinPWMcurrentmodeoperation,theappropriateselectionofRFBresistorinserieswithfourwhiteLEDsset
theoutputcurrentdrivingthemaindisplay.Figure3showsSubdisplayinPFMmode,theappropriateselectionofRSUB1andRSUB2resistorssettheoutputvoltagedrivingtheOLEDsubdisplay.
20128804
FIGURE2.MainDisplay
20128806
20128805
FIGURE3.SubDisplay
20128807
*Note:ThecurrentIFB1isverysmallandisnegligible.
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LM3520AbsoluteMaximumRatings(Note1)
IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheNationalSemiconductorSalesOffice/Distributorsforavailabilityandspecifications.VINVO_MAINVSWMain_FB,Main_RTNMAIN_EN,PFM_EN&SUB_EN(Note2)
ContinuousPowerDissipation(Note3)MaximumJunctionTemperature(TJ-MAX)StorageTemperatureRangeMaximumLeadTemperature(Soldering,10sec)
−0.3Vto+7.5V−0.3Vto+25V−0.3VtoVOUT+0.3V−0.3Vto+7.5V−0.3Vto+7.5VInternallyLimited
ESDRating(Note4)HumanBodyModel:MachineModel:
2.0kV200V
OperatingRatings
InputVoltageRange
JunctionTemperature(TJ)RangeAmbientTemperature(TA)Range(Note3)
2.7Vto5.5V−40˚Cto+125˚C−40˚Cto+85˚C
ThermalProperties
Junction-to-AmbientThermalResistance(θJA),LeadlessLeadframePackage(Note5)
55˚C/W
+150˚C
−65˚Cto+150˚C
+265˚C
LimitsinstandardtypefaceareforTJ=+25˚C.Limitsinboldface
typeapplyoverthefulloperatingjunctiontemperaturerange(−40˚C≤=TJ≤+125˚C).Unlessotherwisenoted:specificationsapplytotheLM3520.VIN=3.6V,V(En)>1.0V,CIN=10µF(Note8).SymbolEnableThreshold
Parameter
MAIN_EN=lowSUB_EN=lowMAIN_EN=highSUB_EN=highPFM_EN=lowPFM_EN=high
IENEnablePinCurrent
MAIN_EN=3.6V(Note10)SUB_EN=3.6V(Note10)PFM_EN=3.6V
IQQuiescentCurrent,DeviceNotSwitching(PWMmode)QuiescentCurrent,DeviceNotSwitching(PFMmode)QuiescentCurrent,DeviceSwitching
PowerOffCurrent(Shutdown)
MAIN_FB>0.5VSUB_FB>1.0V
MAIN_FB=0VorSUB_FB=0V(openloop)MAIN_EN=lowSUB_EN=lowPFM_EN=lowVIN=3.6VVIN=3.6V
MAIN_FB=0.5V(Note9)SUB_FB=1.0V(Note9)VMAIN_FB=0V,VIN=3.6VISW=300mAIPMOS=20mAIMain_RTN=30mA
VMain_RTN=0.5V,VIN=3.6VVFB=0V,VIN=3.6VVIN=3.6VVSW=24V
5
ElectricalCharacteristics(Notes6,7)
ConditionsMinTypMax0.3
Units
V
0.95
0.3
0.95
3330.50.251.75
5551.30.454.5
mAµAV
0.1
0.4551.18
0.51.231050
0.518
0.70.533
20.5451.28
µA
VFBIBICurrentLimitRDS(ON)
FeedbackVoltage(MAIN_FB)FeedbackVoltage(SUB_FB)FBPinLeakageCurrentFBPinBiasCurrentSwitchCurrentLimitMain_SwitchRDS(ON),N1PMOSSwitchRDS(ON),P1MAIN_RTNRDS(ON),N2
VnA
0.917AΩ
Imain_RTN_leakageMain_RTNLeakageCurrentDLimitFSWILeakDutyCycleLimitatPWM&PFMSwitchingFrequencySwitchLeakageCurrent
0.2
90
0.8
1.10.01
1.40.5
µA%MHzµA
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LM3520ElectricalCharacteristics(Notes6,7)LimitsinstandardtypefaceareforTJ=+25˚C.Limitsinboldface
typeapplyoverthefulloperatingjunctiontemperaturerange(−40˚C≤=TJ≤+125˚C).Unlessotherwisenoted:specificationsapplytotheLM3520.VIN=3.6V,V(En)>1.0V,CIN=10µF(Note8).(Continued)SymbolOVPUVPIVout_main_leakIVout_main_biasParameter
OutputOver-VoltageProtection(Main&SubDisplays)InputUnder-VoltageProtectionVOUTLeakageCurrentVOUTBiasCurrentatNoLoad
Conditions
ONThresholdOFFThresholdONThresholdOFFThreshold
VOUT=VIN,MAIN_EN=SUB_EN=0V
VOUT=20V,SUB_EN=0
Min22.221.52.32.35
Typ23.222.52.42.450.160
150Max24.223.52.52.55
UnitsVVnAµA
Note1:AbsoluteMaximumRatingsindicatelimitsbeyondwhichdamagetothecomponentmayoccur.OperatingRatingsareconditionsunderwhichoperationofthedeviceisguaranteed.OperatingRatingsdonotimplyguaranteedperformancelimits.Forguaranteedperformancelimitsandassociatedtestconditions,seetheElectricalCharacteristicstables.
Note2:EnablesignalmustnotbehigherthanInputvoltage.
Note3:Inapplicationswherehighpowerdissipationand/orpoorpackagethermalresistanceispresent,themaximumambienttemperaturemayhavetobederated.Maximumambienttemperature(TA-MAX)isdependentonthemaximumoperatingjunctiontemperature(TJ-MAX-OP=125oC),themaximumpowerdissipationofthedeviceintheapplication(PD-MAX),andthejunction-toambientthermalresistanceofthepart/packageintheapplication(θJA),asgivenbythefollowingequation:TA-MAX=TJ-MAX-OP–(θJAxPD-MAX).
Note4:TheHumanbodymodelisa100pFcapacitordischargedthrougha1.5kΩresistorintoeachpin.Themachinemodelisa200pFcapacitordischargeddirectlyintoeachpin.MIL-STD-8833015.7
Note5:Junction-to-ambientthermalresistance(θJA)istakenfromathermalmodelingresult,performedundertheconditionsandguidelinessetforthintheJEDECstandardJESD51-7.Thetestboardisa4-layerFR-4boardmeasuring101.6mmx76.2mmx1.6mm.Thicknessofthecopperlayersare2oz/1oz/1oz/2oz.Themiddlelayeroftheboardis60mmx60mm.Ambienttemperatureinsimulationis22˚C,stillair.
Junction-to-ambientthermalresistanceishighlyapplicationandboard-layoutdependent.Inapplicationswherehighmaximumpowerdissipationexists,specialcaremustbepaidtothermaldissipationissuesinboarddesign.Note6:AllvoltageiswithrespecttoGND.
Note7:MinandMaxlimitsareguaranteedbydesign,test,orstatisticalanalysis.Typicalnumbersarenotguaranteed,butdorepresentthemostlikelynorm.Note8:CINandCOUT:Low-ESRSurface-MountCeramicCapacitors(MLCCs)usedinsettingelectricalcharacteristics.Note9:FeedbackcurrentflowsoutoftheSub_FBpin.Note10:Currentflowsintothepin.
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LM3520TypicalPerformanceCharacteristics
CMMSHI-40,CIN=10µF,COUTTypicalApplicationcircuitFigure1,VIN=3.6V,L=10µH,D=
=1µF,TA=25˚C,UnlessotherwiseStated.
Non-SwitchingQuiescentCurrentvs.Vin
(DisconnectedRfbfromLED&Rsub2fromVsub)
CloseLoop
SwitchingQuiescentCurrentvs.Vin
(DisconnectedLEDsfromVO_Main&Rsub1fromVsub)
CloseLoop
20128809
20128810
DutyCyclevs.LoadCurrent(PWMatMain_EN)
VIN=3.6V
OscillatorFrequencyvs.Vin
20128812
20128813
Vsub(18V)vs.LoadVsub(15V)vs.Load
20128814
20128815
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LM3520TypicalPerformanceCharacteristicsTypicalApplicationcircuitFigure1,VIN=3.6V,L=10µH,D=
CMMSHI-40,CIN=10µF,COUT=1µF,TA=25˚C,UnlessotherwiseStated.(Continued)
ShutdownCurrentvs.Vin
FeedbackVoltagevs.Vin(4LEDs)
20128829
20128817
FeedbackVoltagevs.Vin(3LEDs)FeedbackVoltagevs.Vin(2LEDs)
2012882720128828
MainDisplayEfficiency(4LEDs)MainDisplayEfficiency(3LEDs)
2012882220128821
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LM3520TypicalPerformanceCharacteristicsTypicalApplicationcircuitFigure1,VIN=3.6V,L=10µH,D=
CMMSHI-40,CIN=10µF,COUT=1µF,TA=25˚C,UnlessotherwiseStated.(Continued)
MainDisplayEfficiency(2LEDs)
VsubEfficiencyvs.Load(Vsub=15V)
20128825
20128823
VsubEfficiencyvs.Load(Vsub=18V)VsubEfficiencyvs.Load(Vsub=20V)
2012882420128826
TypicalPWMSwitchingWaveform(Vin=3.6Vat30mALEDCurrent)TypicalPWMSwitchingWaveform(Vin=3.6Vat4mALEDCurrent)
20128837
20128839
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LM3520TypicalPerformanceCharacteristicsTypicalApplicationcircuitFigure1,VIN=3.6V,L=10µH,D=
CMMSHI-40,CIN=10µF,COUT=1µF,TA=25˚C,UnlessotherwiseStated.(Continued)
TypicalPFMSwitchingWaveform(Vin=3.6V,at30mALoadCurrent)
TypicalPFMSwitchingWaveform(Vin=3.6Vat4mALoadCurrent)
20128838
20128840
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LM3520CircuitDescription
TheLM3520isdesignedforWhiteLED&OLEDbacklightinginmobilephoneapplications.Ithasamaindisplayloopwhichcandriveupto5whiteLEDSinseriesandasubdisplayloopwhichisdesignedtodriveOLEDupto20V/50mA.Themaindisplayloopemploysafixedfrequencycur-rentmodeschemetoregulatetheLEDcurrent.Thesubdisplayloopemploysafixedfrequencygatedoscillatorschemetoregulatetheoutputvoltage.ThedevicehastwoindependentcontrolpinstoenabletheMainorSubdisplays.NotethatbothdisplayscannotbeONatthesametime.
(typ.).Thereisa~1Vhysteresisassociatedwiththiscir-cuitry,whichwillturntheNMOSoffwhentheoutputvoltageisat24.2V(max.)untiltheoutputvoltagereach22.5V(typ.)orlower.The23.5Vlimitallowstheuseof25V1µFceramicoutputcapacitorscreatinganoverallsmallsolutionforwhiteLEDapplications.
UnderVoltageProtection
TheLM3520hasanUVPcomparatortoturntheNMOSpowerdeviceoffincasetheinputvoltageorbatteryvoltageistoolowpreventinganonstateofthepowerdevicecon-ductinglargeamountsofcurrent.
PWMOperation
TheLM3520utilizesasynchronousCurrentModePWMcontrolschemetoregulatethefeedbackvoltageoverallloadandlineconditionsforthemaindisplay.TheLM3520isinternallycompensatedpreventingtheneedforexternalcompensationcomponentsyieldingacompactsolution.Theoperationcanbestbeunderstoodreferringtothefunctionalblockdiagram.TheLM3520operatesasfollows:Duringthefirstcycle,theoscillatorsetsthedriverlogicandturnsontheNMOSpowerdeviceconductingcurrentthroughtheinductorandreversebiasestheexternaldiodeisolatingtheoutputfromtheVSWnode.
TheLEDcurrentissuppliedbytheoutputcapacitorwhentheNMOSpowerdeviceisactive.Duringthiscycle,theoutputvoltageoftheEAMPcontrolsthecurrentthroughtheinductor.Thisvoltagewillincreaseforlargerloadsandde-creaseforsmallerloadslimitingthepeakcurrentintheinductor.ThesumoftheEAMPvoltageandvoltagerampiscomparedwiththesensedswitchvoltage.Oncethesevolt-agesareequal,thePWMCOMPwillthenresetthelogicturningofftheNMOSpowerdeviceandforwardbiasingtheexternaldiodetothewhiteLEDloadandflowsthroughthediodetothewhiteLEDloadandoutputcapacitor.Theinduc-torcurrentrechargestheoutputcapacitorandsuppliesthecurrentforthewhiteLEDbranches.Theoscillatorthensetsthedriverlogicagainrepeatingtheprocess.
ReliabilityandThermalShutdown
TheLM3520hasaninternalthermalshutdownfunctiontoprotectthediefromexcessivetemperatures.Thethermalshutdowntrippointistypically160˚C,Normaloperationre-sumeswhenthetemperaturedropsbelow140˚C.
Startup
TheLM3520doesnotincludeapoweronresetcircuitandreliesonexternalsignaltomonitorenablesignal.Intheeventofundervoltagecondition,thedeviceenablepinmustbebroughtlowuntiltheinputvoltageisabovetheminimumguaranteevoltage(2.7V).
ApplicationInformation
SETTINGLEDCURRENT
TheWhiteLEDcurrentissetusingthefollowingequation:Formaindisplay:
(1)
PWMCONTROL
TheLEDcurrentcanbecontrolledusingaPWMsignalontheenablepinwithfrequenciesintherangeof100Hzto1kHz.LM3520LEDcurrentcanbecontrolledwithPWMsignalfrequenciesabove1kHzbutLEDcurrentisnotlinearlyporportionaltothedutycycle.ThemaximumLEDcurrentwouldbeachievedusingtheequationabovewith100%dutycycle,ie.Theenablepinisalwayshigh.SETTINGSUBVOLTAGE
Sub-displayvoltageisbesetbychoosingRSUB1andRSUB2asillustratedinFigure4.VSUBiscalculatedasfollow:
PFMOperation
TheLM3520utilizesagatedoscillatorcontrolschemeforthesub-display.Thereisahysteresiswindowtoregulatetheoutputvoltage.TheoscillatorfrequencyisthesameasthefrequencyinPWMcontrol.TheDutycycleoftheoscillatorsignalisalwayssettomaximum.Duringthefirstpartofeachswitchingcycle,theinternalNMOSswitchisturnedonuntilthePFMcurrentlimitisreached.WhentheNMOSisoff,thevoltageoftheinductorreversesandforcescurrentthroughthediodetotheoutputcapacitor.ThisprocesscontinuesuntiltheuppercomparatorhysteresisisreachedatwhichpointtheNMOSisdisableduntilthelowercomparatorthresholdisreachedandtheprocessrepeatsagain.
CurrentLimitProtection
TheLM3520hascurrentlimitingprotectiontopreventexces-sivestressonitselfandexternalcomponentsduringover-loadconditions.TheinternalcurrentlimitcomparatorwilldisabletheNMOSpowerdeviceatatypicalswitchpeakcurrentlimitof700mA.
(2)
OutputOver-VoltageProtection
TheLM3520containsdedicatedcircuitryformonitoringtheoutputvoltage.IntheeventthattheprimaryLEDnetworkisdisconnectedtheoutputwillincreaseandbelimitedto23.2V
11
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LM3520ApplicationInformation
(Continued)
enablepinsshouldnotbeONatthesametimeduringnormaloperation.Ifforanyreason,themainandSubenablearehigh,themaindisplaywillenablebydefaultandthesubdisplaywilldisablebydefault.Thefollowingtruthtablesum-marizethelogicstate.
TABLE1.
Main_EN
0011
Sub_EN
0101
MainOFFOFFONON
SubOFFONOFFOFF
INDUCTORSELECTION
TheinductorusedwithLM3520musthaveasaturationcurrentgreaterthanthedeviceswitchpeakcurrentlimit.ChoosinginductorswithlowDCRdecreasespowerlossesandincreasesefficiency.A10µHinductorisoptimalfortheapplications.Ifasmallerinductorisused,thelargertheinductorripplecurrent.Caremustbetakentoselecttheinductorsuchthatthepeakcurrentratingoftheinductoraccountsformaximumloadcurrentfortheoperatingcondi-tion.Itisbesttoselectaninductorwithapeakcurrentratingofthemaximumswitchpeakcurrentofthedevice.Thefollowingequationisusefulfordeterminingtheinductorvalueforagivenapplicationcondition.WhereIOUT_MAX=maximumoutputloadcurrent,VOUT=outputvoltage,VIN-_MIN=minimuminputvoltage,VDIODE=diodeforwardvolt-age,IPeak=PeakCurrentandfmax=maximumswitchfre-quency.
20128805
FIGURE4.
TheaboveequationtosolveforRSUB1.
(3)RSUB1=(VSUB/VSUB_FB–1)RSUB2TheLM3520isoptimizedfor20Vat30mAovertheinputvoltagerange,forhigheroutputcurrentupto50mAisachieveablewithaminimuminputof3.6V.IflowerVSUBisdesired,theoutputcurrentcapabilitywillbehigher.UsingVSUBinCurrentModeConfiguration
IfVsubisusedtodriveastringofLEDs,insteadofusingfigure3configuration(voltagemode).TheLEDscanbearrangedincurrentmodeconfigurationtocontrolloadcur-rent.
TABLE2.
SuppliersCoilcraft
CooperBussmannMurata
Websitewww.coilcraft.comwww.cooperET.comwww.murata.com
20128801
DIODESELECTION
Tomaintainhighefficiency,theaveragecurrentratingoftheschottkydiodeshouldbelargerthanthepeakinductorcur-rent.Schottkydiodeswithalowforwarddropandfastswitchingspeedsareidealforincreasingefficiencyinpor-tableapplications.Chooseareversebreakdownoftheschottkydiodelargerthantheoutputvoltage.Somerecom-mendeddiodesareMBR0530T1fromONsemiconductorandCMMSHI-40fromCentralSemiconductor.
CAPACITORSELECTION
ChooselowESRcapacitorsfortheoutputtominimizeoutputvoltageripple.CeramiccapacitorssuchasX5RandX7Rarerecommendedforuseasinputandoutputfiliters.Thesecapacitorsprovideanidealbalancebetweensmallsize,cost,reliabilityandperformance.DonotuseY5Vceramiccapacitorsastheyhavepoordielectricperformanceovertemperatureandpoorvoltagecharacteristicforagivenvalue.Formostapplications,a1µFceramicoutputcapaci-12
FIGURE5.
MAIN&SUBENABLE
TheLM3520hastwoindependentenablepinstocontrolthemainandsubdisplays.AhighontheMainEnablesignalwillenablethemaindisplay.WhileahighontheSubEnablepinwillenablethesubdisplay.ThePFM_ENpinmusttiedtoSUB_ENforenablingtheSubdisplay.BothMain&Sub
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LM3520ApplicationInformation
(Continued)
SuppliersTDKAVXMurata
TABLE3.
Websitewww.tdk.comwww.avxcorp.comwww.murata.com
torissufficientforthemain-display.Aminimumof4.7µFoutputcapacitorisrecommendedforVSUBoutput.Largeroutputcapacitorcanbeusedtoreduceripplevoltage.TheLM3520hasamaximumOVPof24.2V,a25Vminimumratedcapacitorvoltageisrecommendedfortheapplicationtoensureproperbiasing.
LocalbypassingfortheinputisneededonLM3520.Multi-layerceramiccapacitorswithlowESRareagoodchoiceforthisaswell.A10µFcapacitorissufficientformostapplica-tions.Usinglargercapacitancedecreasesinputvoltagerippleontheinput.Extraattentionisrequiredifsmallercasesizecapacitorisusedintheapplication.Smallercasesizecapacitortypicallyhaslesscapacitanceforagivenbiasvoltageascomparedtoalargercasesizecapacitorwiththesamebiasvoltage.Pleasecontactthecapacitormanufac-turerfordetailinformationregardingcapacitanceversescasesize.Table3listsseveralcapacitorsuppliers.
LAYOUTCONSIDERATIONS
Asforanyhighfrequencyswitcher,itisimportanttoplacetheexternalcomponentsascloseaspossibletotheICtomaximizedeviceperformance.Belowaresomelayoutrec-ommendations:1)Placeinputfilterandoutputfiltercapaci-torsclosetotheICtominimizecoppertraceresistancewhichwilldirectlyeffecttheoverallripplevoltage.2)PlacethefeedbacknetworkresistorsintheMainandSubdisplayclosetotheIC.3)Routenoisesensitivetraceawayfromnoisypowercomponents.4)Connectthegroundpinsandfiltercapacitorstogetherviaagroundplanetopreventswitchingcurrentcirculatingthroughthegroundplane.Simi-larlythegroundconnectionforthefeedbacknetworkshouldtiedirectlytoGNDplane.Ifnogroundplanisavailable,thegroundconnectionsshouldtiedirectlytothedeviceGNDpin.AdditionallayoutconsiderationregardingtheLLPpack-agecanbefoundinApplicationAN1187
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LM3520IntegratedWhiteLEDDriverwithOrganicLEDDisplayPowerSupplyPhysicalDimensions
inches(millimeters)unlessotherwisenoted
14–PinLLP
NSPackageNumberSDA14A
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