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confidential finaldatasheetversion1.0 oct21 th 2011. MAP3205C4channelleddriverforhighbrightness leds orderinginformation typicalapplication partnumber top marking ambient temperaturerange package rohsstatus MAP3205sirh MAP3205 40 to+85 20leadssoic halogenfree MAP3205terh MAP3205 40 to+85 20leadstssopwithepad halogenfree generaldescription the MAP3205 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 MAP3205 is ranged from 8v to 36v and max. led current is 150ma per channel. it can increase the output voltage depending on the drainvoltageratingofboostmosfet. it features pwm dimming control, internal softstar t andhasuniqueadaptiveinternalovp,boostmosfet ocp,ledshort/openprotection,sbdopenprotection anduvlo. theMAP3205isavailablein20leadsetssopand 20leadssoicpackagewithhalogenfree(fullyrohs compliant). features 8vto36vinputvoltagerange driveupto4channels max.150maoutputcurrentperchannel programmableboostswitchingfrequency: 200khzto500khz pwmdimming:upto22khz, minontime:20us analogdimming sbdopenprotection boostovercurrentprotection internaladaptiveovervoltageprotection ledshort/openprotection uvlo 20leadsetssopand20leadssoic applications high brightnesswhite ledbacklighting for mid andlargesizelcdmodule generalledlightingapplications MAP3205 4 channel l eddriver forh i ghbrightnessleds
confidential finaldatasheetversion1.0 oct21 th 2011. MAP3205C4channelleddriverforhighbrightness leds pinconfiguration 20leadsetssop/20leadssoic functionalblockdiagram
confidential finaldatasheetversion1.0 oct21 th 2011. MAP3205C4channelleddriverforhighbrightness leds pindescription 20leads etssop/soic name description 1 vcc powersupplyinput.needexternalinputcapacitor 2 vdd internal10vregulatoroutput.needexternal2.2uf capacitor 3 fsw boosterswitchingfrequencyadjustmentpin(note1) 4 comp internalerroramplifiercompensationpin(note2) 5 gnd ground 6 vadim max.ledcurrentadjustmentpin 7 pwmi pwmsignalinputfordimming(note3) 8 en enablepin.activehigh. 9 fb4 ledcurrentsinkforch4 10 fb3 ledcurrentsinkforch3 11 fb2 ledcurrentsinkforch2 12 fb1 ledcurrentsinkforch1 13 nc noconnection 14 nc noconnection 15 ovp overvoltageprotection(note4) 16 vldo internal5vregulatoroutput.needexternal2.2ufc apacitor 17 pgnd powerground 18 iset iledreferenceresistorsettingpin(note5) 19 cs boostcurrentsensepin(note6) 20 gate gatedriveroutputforexternalpowermosfet exposedpad connecttogroundbymultipleviasforheatsinking purpose(note7) note1 :connectexternalresistortosettheoscillatorf requencyfrom200khzto500khz. note2 :connectexternalcapacitorandresistortocompp in.refertoatypicalapplicationdiagram. note3 :thisexternalpwmsignalisusedforbrightnessc ontrol. note4 :connectcenternodeofresistivevoltagedivider fromoutputtoground.refertoatypicalapplicati ondiagram. note5 :connectexternal200k /1%resistortognd.refertoatypicalapplication diagram..donotleavethispinopen. note6 :connectexternalresistortopgndtosensetheex ternalpowermosfetdraincurrent. note7 :notconnectedinternally.
confidential finaldatasheetversion1.0 oct21 th 2011. MAP3205C4channelleddriverforhighbrightness 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 fsw v vldo, v iset, v ovp, v vadim voltage level on en, cs, pwmi, comp, fsw, vldo, ise t, ovp,vadimpin 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 MAP3205sirh 20leadssoic 54 26 /w MAP3205terh 20leadsetssop 43 4 /w note1 :measuredonjesd517,multilayerpcb
confidential finaldatasheetversion1.0 oct21 th 2011. MAP3205C4channelleddriverforhighbrightness 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 v cc =12v,v en =5v,v pwmi =0v 3.5 ma i gnd groundpincurrentin shutdown v cc =12v,v en =0v,v pwmi =0v 100 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 425 500 575 d max maximumdutycycle 86 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 cc >12v 9 10 11.5 v i sink gatesinkcurrent v dd =10v,v gate =4v 0.05 0.4 a i source gatesourcecurrent v dd =10v,v gate =0v 0.05 0.4 a t rise gateoutputrisingtime 10nfloadcapacitance 50 0 ns t fall gateoutputfallingtime 10nfloadcapacitance 5 00 ns protection t sd thermalshutdown temperature shutdowntemperature 150 c hysteresis, t sd 25 v extovp overvoltageprotection thresholdlevelonovppin risingovervoltagelimitonovppin 1.23 1.28 1.33 v hysteresis, v extovp 0.02 0.12 v intovp internalovervoltageprotection thresholdlevelonfbpin risingovervoltagelimitonfbpin(note1) 1.9 2.0 2.1 v hysteresis, v intovp (note1) 0.54 0.74 v ledshort ledshortprotection threshold fb1~fb4 5.5 v v sbdopen sbdopenprotection thresholdonovppin (note1) 0.1 v t scp ledshortprotectiontime f sw =500k hz 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 led =150ma 0.8 v i fb currentaccuracy i led =100ma 3 % km currentmatching(note2) i led =100ma 2.5 % i fb_max currentsinkmaxcurrent vadim=3v 150 ma v adim adiminputvoltagerange 1 3 v pwminterface f pwm pwmdimmingfrequency 0.1 22 khz v pwmi logicinputlevelon pwmipin v pwmi_l :logiclow 0.8 v v pwmi_h :logichigh 2.3 i pwmi leakagecurrentonpwmi pin v pwmi =1v 4 a t pwmon_min minimumonduty f pwm =500hz 20 us note 1. no test on mass production note 2. 100 [%] min max min max + ? = i i i i km
confidential finaldatasheetversion1.0 oct21 th 2011. MAP3205C4channelleddriverforhighbrightness leds typicaloperatingcharacteristics unlessotherwisenoted,v in =24v,i led =100ma,ledstring=4*15,cin=22uf,cout=47uf*2 andt a =25 c. vcs(mv)
confidential finaldatasheetversion1.0 oct21 th 2011. MAP3205C4channelleddriverforhighbrightness leds typicaloperatingcharacteristics unlessotherwisenoted,v in =24v,i led =100ma,ledstring=4*15,cin=22uf,cout=47uf*2 andt a =25 c. ccmoperation v out gate drain i_l 10v/div 10v/div 20v/div 2a/div dcmoperation v out gate drain i_l 10v/div 10v/div 20v/div 2a/div turnon turnoff v out drain vin iin 10v/div 20v/div 5v/div 2a/div v out drain vin iin 10v/div 20v/div 5v/div 2a/div min.dimming(pwm=500hz/20us) sbdopenprotection pwmi iled 2v/div 200ma/div gate vin en pwmi 10v/div 10v/div 2v/div 2v/div ledopenprotection ledshortprotection vout fb1 fb2 fb3 20v/div 20v/div 20v/div 20v/div vout fb1 10v/div 5v/div
confidential finaldatasheetversion1.0 oct21 th 2011. MAP3205C4channelleddriverforhighbrightness leds applicationinformation currentmodeboostswitching controlleroperation the MAP3205 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 MAP3205 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 MAP3205 has builtin 5v ldo regulator to supply internalanalogandlogicblocks.theldoispowere dup whentheenpinislogichigh.a2.2ufbypasscapac itor isrequiredforstableoperationoftheldo. a10vldoisusedtodriveexternalmosfetconnecte d tothegatepin.a2.2ufbypasscapacitorisrequir edfor stableoperationoftheldo. dimmingscheme thebrightnesscontroloftheledsisperformedby a pulsewidthmodulationofthechannelcurrent.when a pwm signal is applied to the pwmi pin, the current generators are turned on and off mirroring the pwmi pinbehavior. when pwmi signal stays at low level (<0.8v) for a long time, the MAP3205 turns off the boost circuitr y, but internal circuit is enabled so the MAP3205 increasestheoutputvoltagepromptly. the minimum dimming on duty is 1% at 500hz(= 20us). boostswitchingfrequency adjustment the switching frequency of the MAP3205 should be programmed between 200khz and 500khz by an externalresistorconnectedbetweenthefswpinand ground. do not leave this pin open. the approximate operatingboostswitchingfrequencycanbecalculat ed byfollowingequation. ledcurrentadjustment the MAP3205 sets the led current through the voltage level on vadim pin. vadim pin voltage vs. led current is as below table. a 200k /1% resistor mustbeconnectedbetweentheisetpinandground. vadimvoltage[v] ledcurrent[ma] 1.0 50 1.2 60 1.4 70 1.6 80 1.8 90 2.0 100 2.2 110 2.4 120 2.6 130 2.8 140 3.0 150 if the vadim voltage is fixed, the led current can alsobeprogrammedbyfollowingequation. overvoltageprotection (1) externalovp the MAP3205 features a dedicated overvoltage feedback input. the ovp pin is connected to the center tap of resistive voltagedivider from the hi gh voltage output(see the typical application). when o ne or more channels are opened, the output voltage is boosted to external ovp level and ovp pin voltage exceeds typical 1.28v. a corresponding comparator turns off the external power mosfet. this switch is reenabled after the ovp pin voltage drops hysteres is voltage(?extovp)belowtheprotectionthreshold. this over voltage protection feature ensures the bo ost converter failsafe operation when the led channels are disconnectedfromtheoutput. the ovp level can be calculated with the following equation. (2) internaladaptiveovp the MAP3205 features an adaptive internal ovp by sensingthefbvoltage. when all the fb voltage exceeds typical 2v, a corresponding comparator turns off the external mosfet. this switch is reenabled after all the fb voltagedropshysteresisvoltage(?intovp) belowth e protectionthreshold. ] [ 50 ] [ = k r mhz f fsw sw 10000 ] [ ] [ = k r vadim ma i iset led ovpl ovpl ovph ovp ext out r r r v + = 28 .1 _ _
confidential finaldatasheetversion1.0 oct21 th 2011. MAP3205C4channelleddriverforhighbrightness leds boostovercurrentprotection the MAP3205 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 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. sbdopenprotection when ovp pin voltage is less than 0.1v, a corresponding comparator turns off the external mosfet. this protects the driver from damage if the output schottky diode is open(defective or poor solder contact). ledopenprotection incasethevoltageatanyoffb1~4pinsisbelowl ed open protection threshold(v ledopen ) due to led open during normal operation, the MAP3205 excludes the corresponding string and the remaining string(s) wi ll continue operation. once the led open status is removed, the corresponding string is automatically recovered. 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 MAP3205 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). paralleloperation even the MAP3205 has 4 channel and 150ma led current capability per channel, 2 channel and 300ma application can be supported by tying 2fbs into 1ch , so the led current capability can be increased to 300ma. vcs(mv) peak l cs cs i v r _ 8.0 =
confidential finaldatasheetversion1.0 oct21 th 2011. MAP3205C4channelleddriverforhighbrightness 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 MAP3205 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 MAP3205 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 tocrosstalkifplacedbythesideofananalogli ne.itis recommended to avoid placing the output line especiallybythesideofcs,iset,vadim.fsw,ovp , compasfaraspossible. = 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 finaldatasheetversion1.0 oct21 th 2011. MAP3205C4channelleddriverforhighbrightness leds physicaldimensions 20leadstssop 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 6.40 6.60 d1 2.20 e 6.40bsc e1 4.30 4.50 e2 1.50 e 0.65bsc l 0.45 0.75 l1 1.00ref ? 0 8
confidential finaldatasheetversion1.0 oct21 th 2011. MAP3205C4channelleddriverforhighbrightness leds 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 e1 7.30 7.70 e 1.27bsc l 0.40 1.27 l1 1.40ref ? 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 20leadssoic
confidential finaldatasheetversion1.0 oct21 th 2011. MAP3205C4channelleddriverforhighbrightness leds revisionhistory date version changes 20111021 version1.0 initialrelease

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