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confidential datasheetversion1.5 feb28 th 2012. 1 map3204C4channelleddriverforhighbrightness leds orderinginformation typicalapplication partnumber top marking ambient temperaturerange package rohsstatus MAP3204SIRH map3204 40 to+85 20leadssoic halogenfree map3204terh map3204 40 to+85 16leadstssopwithepad halogenfree generaldescription the map3204 is a 4channel led driver optimized for led backlight application targeting mid and lar ge size lcd module. it uses the boost mosfet externallyand4channelcurrentsourcesinternally for drivinghighbrightnesswhiteleds input voltage of the map3204 is ranged from 8v ~ 36v and max. led current is 150ma per channel. it can increase the output voltage depending on the drainvoltageratingofboostmosfet. it features pwm dimming control and internal soft start and has protections like output overvoltage, boost overcurrent, led short/open, sbd open and uvlo. themap3204isavailablein16leadsetssopand 20leadssoicpackagewithhalogenfree(fullyrohs compliant). features 8vto36vinputvoltagerange driveupto4channels 150maoutputcurrentperchannel programmableboostswitchingfrequency: 100khzto500khz pwmdimming:upto22khz currentmodecontrol boostovercurrentprotection outputovervoltageprotection ledshort/openprotection sbdopen/outputshortprotection uvlo 16leadsetssopand20leadssoic applications high brightnesswhite ledbacklighting for mid andlargesizelcdmodule generalledlightingapplications map3204 4 channel l eddriver forh i ghbrightnessleds
confidential datasheetversion1.5 feb28 th 2012. 2 map3204C4channelleddriverforhighbrightness leds pinconfiguration 16leadsetssop 20 leadssoic functionalblockdiagram + - + - + - + - + - current generator headroom control + - vref + - pwm controller 1.28v osc s r q /q 5vldo gate fb1 fb2 fb3 fb4 fsw ovp vdd comp gnd pwmi en cs led open/short protection slope compensation 10vldo vcc iset + - 0.1v + - thermalshutdown sbdopen/ outputshort vldo 1.2v currentsense amp
confidential datasheetversion1.5 feb28 th 2012. 3 map3204C4channelleddriverforhighbrightness leds pindescription name 16leadse tssop 20leadssoic description vcc 16 1 powersupplyinput.needexternalinputcapacitor. gnd 4,13 5,17 ground vdd 1 2 internal10vregulatoroutput.connectto2.2ufcap acitor fsw 2 3 boosterswitchingfrequencyadjustmentpin(note1) comp 3 4 internalerroramplifiercompensationpin(note2) iset 5 6 max.ledcurrentadjustmentpin(note3) en 7 8 enablepin.activehigh. pwmi 6 7 pwmsignalinputfordimming(note4) fb1 11 12 ledcurrentsinkforch1 fb2 10 11 ledcurrentsinkforch2 fb3 9 10 ledcurrentsinkforch3 fb4 8 9 ledcurrentsinkforch4 ovp 12 15 overvoltagesensepin(note5) cs 14 19 boostcurrentsensepin(note6) gate 15 20 gatedriveroutputforexternalpowermosfet vldo 16 internal5vregulatoroutput.connectto2.2ufcapa citor nc 13,14,18 connecttogroundforheatsinkingpurpose exposedpad connect to ground by multiple vias for heatsinking purpose (note7) note1 :connectexternalresistortosettheoscillatorf requencyfrom100khzto500khz. note2 :connectexternalcapacitorandresistortocompp in.refertoatypicalapplicationdiagram. note3 :theresistorvalueonisetpinwillcontrolthef ullscalelevelofsinkcurrentonfbpins.donot leavethispinopen. note4 :thisexternalpwmsignalisusedforbrightnessc ontrol. note5 :connectcenternodeofresistivevoltagedivider fromoutputtoground.refertoatypicalapplicati ondiagram. note6 :connectexternalresistortopgndtosensetheex ternalpowermosfetdraincurrent. note7 :notconnectedinternally.
confidential datasheetversion1.5 feb28 th 2012. 4 map3204C4channelleddriverforhighbrightness leds absolutemaximumratings (note1) symbol parameter min max unit v cc supplyvoltage 0.3 36 v v gate gatedriveroutput 0.3 14 v v vdd vddpin 0.3 14 v v en ,v cs ,v pwmi ,v comp ,v ovp ,v fsw v iset input voltage signal level on en, cs, pwmi, comp, o vp, fsw,iset 0.3 7 v v fb1~4 ledcurrentsinkpin 0.3 65 v i fb1~4 ledcurrentsinkpin 200 ma t pad solderinglead/padtemperature10sec 300 c t j junctiontemperature 40 +150 c t s storagetemperature 65 +150 c esd hbmonallpins(note2) 2000 +2000 v mmonallpins(note3) 200 +200 note 1 : stresses beyond the above listed maximum ratings may damage the device permanently. operating above the recommended conditions for extended time may stress the device and affect device reliability. also the device may not operate normally above the recommendedoperatingconditions.thesearestress ratingsonly. note2 :esdtestedperjesd22a114. note3 :esdtestedperjesd22a115. recommendedoperatingconditions (note1) parameter min max unit v cc supplyinputvoltage 8 36 v i fb1~4 ledcurrentsinkpin 50 150 ma v fb1~4 ledcurrentsinkpin 65 v t a ambienttemperature(note2) 40 +85 c note1 :normaloperationofthedeviceisnotguaranteed ifoperatingthedeviceoveroutsiderangeofrecom mendedconditions. note2 :theambienttemperaturemayhavetobederatedif usedinhighpowerdissipationandpoorthermalre sistanceconditions. packagethermalresistance (note1) parameter ja jc unit MAP3204SIRH 20leadssoic 54 26 /w map3204terh 16leadsetssop 46 8 /w note1 :measuredonjesd517,multilayerpcb
confidential datasheetversion1.5 feb28 th 2012. 5 map3204C4channelleddriverforhighbrightness leds electricalcharacteristics unlessnoted,v in =12v,c in =1.0 f,andtypicalvaluesaretestedatt a =25 c. boldface valuesindicate40 cto+85 coft a . 3 parameter testcondition min typ max unit generalinputoutput v cc inputvoltagerange 8.0 36 v i q quiescentcurrent drivingfbsatminimumsettingw ithnoload 3 ma i gnd groundpincurrentin shutdown v cc =12v,v en =0v noloadcurrentonfbs 40 a v en logicinputlevelon enpin v en_l :logiclow 0.8 v v en_h :logichigh 2.0 r en_pulldown pulldownresistoronenpin 500 k v uvlo undervoltagelockout thresholdvoltageonvddpin releaseuvlo 6.0 7.5 v lockoutuvlo 4.0 5.5 oscillator f sw internaloscillator frequency r fsw =250k 180 200 220 khz r fsw =100k 450 500 550 d max maximumdutycycle 85 90 % reference v vdd 10vldovoltage v cc >12v,noloadcurrent 9 10 11.5 v v ldo 5vldovoltage v cc >8v,noloadcurrent 4.5 5 5.5 v boostmosfetdriver v gate gatedrivevoltage v in >12v 9 10 11.5 v i sink gatesourcecurrent 20 ma i source gatesinkcurrent 20 ma t rise gateoutputrisingtime 1nfloadcapacitance 100 500 ns t fall gateoutputfallingtime 1nfloadcapacitance 100 500 ns protection t sd thermalshutdown temperature shutdowntemperature 150 c hysteresis, t sd 25 v ovp overvoltagethreshold levelonovppin risingovervoltagelimitonovppin 1.23 1.28 1.33 v hysteresis, v ovp 0.05 0.12 v ledshort ledshortprotection threshold fb1~fb4 5.5 v v sbdopen sbdopenprotection thresholdonovppin 0.1 v t scp ledshortprotectiontime f sw =500khz(note2) 8.192 ms v cs boostovercurrent protectionthreshold gatedutycycle=90% 0.306 0.360 0.414 v v ledopen ledopenprotection threshold i led =50ma 0.05 v i led =150ma 0.15 v ledcurrentsinkregulator v fb1~4 minimum fb1~fb4 voltage for theoperationtosink150ma i set =150ma 0.8 v i fb currentaccuracy i led =100ma 3 % km currentmatching(note1) i led =100ma 2.5 % i fb_max currentsinkmaxcurrent 150 ma pwminterface f pwm pwmdimmingfrequency 0.1 22 khz v pwmi logicinputlevelon pwmipin v pwmi_l :logiclow 0.8 v v pwmi_h :logichigh 2.2 i pwm leakagecurrentonpwmi pin v pwm =1v 2 a t pwmon_min minimumonduty f pwm =1khz 10 us . (note 1) (note 2) 4096 1 = fsw tscp 100 [%] min max min max + ? = i i i i km
confidential datasheetversion1.5 feb28 th 2012. 6 map3204C4channelleddriverforhighbrightness leds applicationinformation currentmodeboostswitching controlleroperation the map3204 employs current mode control boost architecture that has a fast current sense loop and a slow voltage feedback loop. such architecture achievesafasttransientresponsethatisessentia lfor theledbacklightapplication. dynamicheadroomcontrol the map3204 features a proprietary dynamic headroom control circuit that detects the lowest voltage from any of the fb1fb4 pins. this lowest channelvoltageisusedasthefeedbacksignalfor the boostcontroller.sinceallledstacksareconnecte din paralleltothesameoutputvoltage,theotherfbp ins will have a higher voltage, but the regulated curre nt source circuit on each channel will ensure that eac h channelhasthesamecurrent. internal5v/10vregulator the map3204 has builtin 5v ldo regulator to supply internalanalogandlogicblocks.theldoispowere dup whentheenpinislogichigh. a10vldoisusedtodriveexternalmosfetconnecte d tothegatepin.a2.2ufbypasscapacitorisrequir edfor stableoperationoftheldo. dimmingscheme when pwmi signal stays at low level (<0.8v) for a long time, the map3204 turns off the boost circuitr y, but internal circuit is enabled so the map3204 increasestheoutputvoltagepromptly. theminimumdimmingondutyis1%at1khz=10us. paralleloperation eventhemap3204has4chand150maledcurrent capability per channel, 2ch and 300ma application canbesupportedbytying2fbsinto1ch,sotheled currentcapabilitycanbeincreasedto300ma. boostswitchingfrequency adjustment the switching frequency of the map3204 should be programmed between 100khz and 500khz by an externalresistorconnectedbetweenthefswpinand ground. do not leave this pin open. the approximate operatingboostswitchingfrequencycanbecalculat ed byfollowingequation. ledcurrentadjustment the full scale led drive current of the map3204 should be programmed up to 150ma by an external resistorconnectedbetweentheisetpinandground. do not leave this pin open. the led current can be setbyfollowingtable. iled [ma] riset [k?] used 4-ch used 3-ch used 2-ch used 1-ch 50 216 riset (4-ch) 1.025 riset (4-ch) 1.05 riset (4-ch) 1.08 60 184 70 159 80 139 90 123 100 111 110 100 120 92 130 85 140 79 150 73 due to internal gnd impedance, the led current increaseswithincreaseofthenumberofopenchann el.if there are open channels, specific weight should be multiplied to 4channel riset with the number of op en channel. for example, the riset value is 111k for 100maledcurrentfor4channelapplication,butin case of3channelapplication,therisetshouldbechose nby 113.8k(=111 1.025). it is needed fine tuning for these riset values consideringdeviationofresistorsandetc. overvoltageprotection toprotecttheboostconverterwhentheloadisope n, or the output voltage becomes excessive for any reason, the map3204 features a dedicated overvoltagefeedbackinput.theovppinisconnecte d tothecentertapofaresistivevoltagedividerfr omthe highvoltageoutput(seethetypicalapplication). when theovppinvoltageexceedstypical1.28v,acompar ator turns off the external power mosfet. this switch is re enabledaftertheovppinvoltagedropshysteresis( ?ovp) below the protection threshold. this over voltage protection feature ensures the boost converter fail safe operationwhentheledchannelsaredisconnectedfr om theoutput. itisrecommendedthattheovpvoltagebesetto1. 2 timesofoutputvoltage.theovplevelcanbecalcu lated withthefollowingequation. ovpl ovpl ovph ovp out r r r v + = 28 .1 _ ] [ 50 ] [ = k r mhz f fsw sw
confidential datasheetversion1.5 feb28 th 2012. 7 map3204C4channelleddriverforhighbrightness leds boostovercurrentprotection the map3204 features overcurrent protection (ocp) by sensing cs pin voltage. this cs pin is used for inductor current sensing for current mode controlaswell. the internal ocp sensing voltage decreases with increase of gate dutycycle due to internal slope compensationwhichensuresstableccmoperation. following graph shows the relationship between diode open / output shortcircuit protection when ovp pin voltage is less than 0.1v, the map3204 turns off the external mosfet. this protectsthedriverfromdamageiftheoutputschot tky diode is open(defective or poor solder contact), or outputvoltageisshorttoground. gatedutycycleandinternalocpsensingvoltage in order to avoid touching the current limit during normal operation, the voltage across the current sensing resistor rcs should be less than 80% of the worstcasecurrentlimitvoltage. ledopenprotection in case the voltage on led current sink pins (fb1~4 ) arebelowledopenprotectionthresholdvoltagedue to ledopen,theoutputvoltageisboosteduptoovpl evel. the map3204 automatically ignores the corresponding channelandremainingstring(s)willcontinueopera tion. the operation is resumed recycling the en pin or applyingacompletepoweronreset(por). if all the strings are open, the output voltage rem ains betweenovp_highandovp_lowlevel. ledshortprotection if the voltage at any of the fb14 pins exceeds a threshold of approximately 5.5v due to led short during normal operation, the map3204 turns off the corresponding string after led short protection time(tscp) and the remaining string(s) will continu e operation. the operation is resumed recycling the e n pinorapplyingacompletepoweronreset(por). turnoffsequence to avoid abnormal gate turnon at turnoff, pwmi shouldbeturnedoffinadvanceofenoff. vcs(mv) peak l cs cs i v r _ 8.0 =
confidential datasheetversion1.5 feb28 th 2012. 8 map3204C4channelleddriverforhighbrightness leds operationtimingchart aftertheenableturnson,theinternal5vldoisp oweredupandtheinternaloscillatorstartsoscill ation.ifthepwmi signal remains low at the initial state, the gate d rive output to the external mosfet also remains low , so the boost controllerdosenotstepuptheoutputvoltage.as soonasthepwmisignalturnsonoverthanatleast 1%dutycycleat fpwmi=1khz,thecontrollerperformssoftstartand continuesregulationthroughoutthepwmionduty.i nthemeantime eachfbsareturnedonsimultaneouslyandthecons tantcurrentflowstheleds.thetimingbetweenpwm iandfbis approximatelysame. themap3204booststheoutputvoltageonlyincondi tionthatvccisappliedandenandpwmiisturned on.anditis guaranteed that thereis no abnormal operationwith regard to turnonsequence. but incase that vcc(v in)isapplied lastlyafterenandpwmiisturnedon,thestartup currentisincreasedbecausetheoutputvoltageis boostedfrom0vto ovplevel. ifthepwmisignalremainslowstateoverthan16.4 msat500khzboostswitchingfrequencyduringnorma loperation, the controller regards it as dimzero condition. be cause of discharge of output capacitor through the ovp sensing resistorsduringthedimzerotime,theoutputvolt agegettingdeclined.sothecontrollerperformsso ftstarttoboostthe outputvoltageuntilitreachestheovervoltagepr otectionlevelwithregardingthedimmingdutycycl eas100%.forthis reason,someextraswitchingcanbeseenwhentheo ndutyofpwmisignalislessthantheinternalboo stonperiod.
confidential datasheetversion1.5 feb28 th 2012. 9 map3204C4channelleddriverforhighbrightness leds externalcomponentsselection inductor theinductorvalueshouldbedecidedbeforesystem design. because the selection of the inductor affec ts the operating mode of ccm(continuous conduction mode) or dcm(discontinuous conduction mode). in ccm operation, inductor size should be bigger, even thoughtheripplecurrentandpeakcurrentofinduc tor can be small. in dcm operation, even ripple current andpeakcurrentofinductorshouldbelargewhile the inductorsizecanbesmaller. the inductor dc current or input current can be calculatedasfollowingequations. ?Cefficiencyoftheboostconverter thenthedutyratiois, v d C forward voltage drop of the output rectifying diode whentheboostconverterrunsindcm(l lcritical, generally the converter has higher efficiency under ccmandtheinductorpeakcurrentis, input capacitor in boost converter, input current flows continuousl y into the inductor; ac ripple component is only proportionaltotherateoftheinductorcharging, thus, smaller value input capacitors may be used. ensure the voltage rating of the input capacitor is suitab le to handlethefullsupplyrange. a capacitor with low esr should be chosen to minimize heating effects and improve system efficiency. output capacitor theoutputcapacitoractstosmooththeoutputvolt age andsuppliesloadcurrentdirectlyduringthecondu ction phase of the power switch. output ripple voltage consistsofthedischargeoftheoutputcapacitord uring the fet ton period and the voltage drop due to load currentflowingthroughtheesroftheoutputcapac itor. theripplevoltageisshowninfollowingequation. assume a ceramic capacitor is used. the minimum capacitanceneededforagivenripplecanbeestima ted byfollowingequation. output rectifying diode schottky diodes are the ideal choice for map3204 due to their low forward voltage drop and fast switching speed. make sure that the diode has a voltage rating greater that the possible maximum outputvoltage.thediodeconductscurrentonlywhe n thepowerswitchisturnedoff. loop compensation the map3204 controls in current mode. current mode easily achieves compensation by consisting simplesinglepolefromdoublepolethatlcfilerm akes at voltage mode. in general, crossover frequency is selected from 1/3 ~ 1/6 range of the switching frequency.iffcislarge,thereispossibilityof oscillation tooccur,althoughtimeresponsegetsbetter. ontheotherhand,iffcissmall,timeresponsewi llbe bad, while it has improved stability, which may cau se overshootorundershootinabnormalcondition. layout consideration a gate drive signal output from gate pin becomes noisesource,whichmaycausemalfunctionoficdue to cross talk if placed by the side of an analog line. it is recommended to avoid placing the output line especiallybythesideofcs,iset,fsw,ovp,comp asfaraspossible. = in out out in v i v i d out d in out v v v v v d + + ? = l f d v i sw in dcm peak l = _ _ l f d v i i sw in in ccm peak l + = 2 _ _ esr i f c d i v out sw out out out + = out sw out out out in out v f v i v v c ? = ) (
confidential datasheetversion1.5 feb28 th 2012. 10 map3204C4channelleddriverforhighbrightness leds physicaldimensions symbol dimension min norm max a 2.65 a1 0.05 0.30 a2 2.05 2.40 b 0.31 0.51 c 0.20 0.33 d 12.54 13.00 e 10.00 10.65 e1 7.30 7.70 e 1.27bsc l 0.40 1.27 l1 1.40ref ? 0 8 20leadssoic (topview)
confidential datasheetversion1.5 feb28 th 2012. 11 map3204C4channelleddriverforhighbrightness leds 16leadstssop (topview) symbol dimension min norm max a 1.20 a1 0.00 0.15 a2 0.80 1.05 b 0.19 0.30 c 0.09 0.20 d 4.90 5.10 d1 2.20 e 6.40bsc e1 4.30 4.50 e2 2.20 e 0.65bsc l 0.45 0.75 l1 1.00ref l2 0.25ref ?1 0 8 magnachipsemiconductorltd. doesntnotrecommendtheuseofitsproductsinh ostileenvironments,including,withoutlimitation, aircraft,nuclearpowergeneration,medicalapplian ces,anddevicesorsystemsinwhichmalfunctionof anyproductcanreasonably beexpectedtoresultinapersonalinjury.seller scustomersusingorsellingsellersproductsfor useinsuchapplicationsdosoat theirownriskandagreetofullydefendandindemn ifyseller. magnachip reserves the right to change the specifications an dcircuitry without notice at any time. magnachip does not consider responsibilityforuseofanycircuitryotherthan circuitryentirelyincludedina magnachip product. isaregisteredtrademarkofmagnachipsemiconducto rltd. magnachipsemiconductorltd. 891,daechidong,kangnamgu,seoul,135738korea tel:82269033451/fax:82269033668~9 www.magnachip.com

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