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confidential datasheet version 1.0 november 2012 page 1 MAP3232 C dual channel switch mode operating led dr iver ordering information typical application part number top marking ambient temperature range package rohs status MAP3232sirh MAP3232 -40 to +85 soic-24 pin halogen free general description MAP3232 is high efficiency dual channel boost type pwm driver in single package. it is designed for hi gh brightness led driver optimized for backlighting system for large size lcd module. MAP3232 offers the function of accurate and fast le d dimming control using pwm interface and external dimming mosfet. MAP3232 has the over-voltage protection, uvlo, led short current and boost switch current limit protection. it has the power good indication as the interface with tv set MAP3232 is available in soic-24 pin package with halogen-free (fully rohs compliant). for more information, please contact local magnachi p sales office in world-wide or visit magnachips web site at www.magnachip.com . features dual output into single package wide input voltage range : 8.5v ~ 36v dual pwm and analog dimming current mode control type adjustable sw frequency : 100khz ~ 500khz 10v gate drive reference voltage : 5.0v 1.0% protections : boost ocp, ovp, uvlo, led short, boost diode open programmable led short current protection boost switch current limit protection auto-restart mode power good package : soic-24 pin applications high brightness white led backlighting for lcd tvs and monitors general led lighting applications datasheet - map323 2 dual channel switch mode operating led driver
confidential datasheet version 1.0 november 2012 page 2 MAP3232 C dual channel switch mode operating led dr iver pin configuration 1 2 3 4 5 6 7 24 23 22 21 20 19 18 8 17 9 16 10 15 11 14 12 13 pin description pin no description 1 vcc power supply input 2 en enable 3 vdd internal regulator output for gate drive 4 luvp input line voltage sense 5 isen1 ch#1 led current sense connected to error a mp. inverting input 6 pdimo1 ch#1 dimming pwm gate driver output 7 comp1 ch#1 error amp. compensation 8 ovp1 ch#1 over voltage protection 9 gate1 ch#1 gate drive output for boost convert 10 cs1 ch#1 current sense of the boost convert 11 pdimi1 ch#1 dimming pwm gate driver input 12 pgnd power gnd 13 pdimi2 ch#2 dimming pwm gate driver input 14 cs2 ch#2 current sense of the boost convert 15 gate2 ch#2 gate drive output for boost convert 16 ovp2 ch#2 over voltage protection 17 comp2 ch#2 error amp. compensation 18 pdimo2 ch#2 dimming pwm gate driver output 19 isen2 ch#2 led current sense connected to error amp. inverting input 20 pgood power good indication (open-drain status output, normal : open, protectio n : internal gnd) 21 rt/ct oscillator frequency setting 22 vref reference voltage 23 adim analog dimming for ch#1 and ch#2 24 sgnd signal gnd
confidential datasheet version 1.0 november 2012 page 3 MAP3232 C dual channel switch mode operating led dr iver functional block diagram + cs_comp - + err_amp - adim 3r r s q r qb clk pg drv drv pg prt2 pwmd2 leb clk scp(adim*4) or ovp(3v/2.7v) ar 1ms + cs_comp - + err_amp - 3r r s q r qb clk pg drv drv pg sbd_prt (0.1v/0.05v) or luvp_prt (2v/1.8v) prt1 pwmd1 leb clk scp(adim*4) or ovp(3v/2.7v) ar 1ms sbd_prt (0.1v/0.05v) or luvp_prt (2v/1.8v) luvp luvp luvp +- 1.25r isen1 3r -+ isen2 timer q s qb r prt1 pg clk clk adim adim comparator adim comparator q s qb r prt2 pg enable bandgap reference lo a d current reference voltage reference vldo uvlo vbgr vldo tsd pg vcc vdd osc clk por pg vbgr vcc vref timer
confidential datasheet version 1.0 november 2012 page 4 MAP3232 C dual channel switch mode operating led dr iver absolute maximum ratings parameter value unit vcc -0.3 ~ 40 v gate1/2, pdimo1/2, pdimi1/2, luvp, vdd, en, adim -0.3 ~ 12 v cs1/2, comp1/2, isen1/2, ovp1/2, vref, rt/ct, pgood -0.3 ~ 5.5 v operating junction temperature range -40 ~ 125 storage temperature range -65 ~ 150 lead temperature(soldering, 10sec ) 260 thermal resistance ( ja) 56.8 /w
confidential datasheet version 1.0 november 2012 page 5 MAP3232 C dual channel switch mode operating led dr iver electrical characteristics vcc=12v, v pdimi =5v, c gate =c pdimo =1nf, ta=25 , unless otherwis e specified symbol parameter test condition min typ max unit supply vcc , op input voltage range ta = - 40 ~ 85 8.5 - 36 v i q operation quiescent current pdimi 1/2 = 0v - 3 5 m a i op operation current pdimi 1/2 = 5v - - 20 ma v uvlo under-voltage lockout release threshold - 7.3 7.8 8 .3 v under-voltage lockout hysteresis - - 0.5 - v enable v en enable input voltage on en pin v en_l : logic low - - 0.8 v v en_h : logic high 2.0 - - v i en enable input current on en pin v en = 0v - 2.0 4.0 a r enable enable pull-down resistance - 250 500 1000 k vref & vdd v ref reference pin voltage ta = - 40 ~ 85 , no load 4.90 5.00 5.10 v ta = 25 , no load 4.95 5.00 5.05 v v refli line regulation i ref = 0ua, pdimi = 0v, c ref = 0.1uf - - 0.02 %/v v reflo load regulation i ref = 0~500ua, pdimi = 0v, c ref = 0.1uf - - 1 %/ma v vdd vdd pin voltage ta = 25 , no load 9.0 10 11.5 v oscillator f osc oscillator frequency r rt = 20k , c ct = 390pf, ta = 25 180 200 220 khz d max maximum duty cycle - - 90 - % gate (ch1, ch2) i source gate short circuit current v gate = 0, vcc = 12v 0.03 0.06 - a i sink gate sink current v gate = 10v, vcc = 12v 0.15 0.3 - a t rise gate output rise time c gate = 1nf, vcc = 12v - 50 100 ns t fall gate output fall time c gate = 1nf, vcc = 12v - 25 50 ns
confidential datasheet version 1.0 november 2012 page 6 MAP3232 C dual channel switch mode operating led dr iver electrical characteristics (continued) vcc=12v, v pdimi =5v, c gate =c pdimo =1nf, ta=25 , unless otherwise specified symbol parameter test condition min typ max unit current sense (ch1, ch2) t blank leading edge blanking - 100 - 375 ns t delay delay to output of cs comparator(2) v comp = 5v v cs = 0v to 600mv step pulse - - 180 ns v cs,max maximum cs voltage vcc = 12v, v adim C v isen > 0.2 0.445 0.47 0.495 v internal transconductance opamp (ch1, ch2) a v open loop dc gain(2) - - 50 - db v cm input common-mode range - 0.1 - 3.0 v v o output voltage low limit vcc = 12v, v isen C v adim > 0.2 - 0.65 - v output voltage high limit vcc = 12v, v adim C v isen > 0.2 - 2.65 - v gm transconductance(2) - 400 670 1000 ua/v i bias input bias current - - 0.5 1 na internal transconductance opamp (ch1, ch2) v offset input offset voltage - -5 - 5 mv i _amp_source amp source current v isen = 1v, v adim = 2v, v comp = 1.5v - -120 - ua i _amp_sink amp sink current v isen = 2v, v adim = 1v, v comp = 1.5v - 120 - ua dimming pwm input (ch1, ch2) v pdimi(lo) pdimi input low voltage - - - 0.8 v v pdimi(hi) pdimi input high voltage - 2.0 - - v r pdimi pdimi pull-down resistance v pwmi = 5v 250 500 1000 k dimming pwm output (ch1, ch2) t rise,pdimo pdimo output rise time 1nf capacitance at pdimo - - 300 ns t fall,pdimo pdimo output fall time 1nf capacitance at pdimo - - 200 ns over voltage protection (ovp) v ovp over voltage protection - 2.98 3.05 3.12 v v ovph over voltage protection hysteresis - 0.3 - v t ovp ovp filtering time(2) - 200 - ns
confidential datasheet version 1.0 november 2012 page 7 MAP3232 C dual channel switch mode operating led dr iver electrical characteristics (continued) vcc=12v, v pdimi =5v, c gate =c pdimo =1nf, ta=25 , unless otherwise specified symbol parameter test condition min typ max unit short current protection ( scp ) v th,scp scp comparator threshold voltage v adim = 0.8v ( v th,scp = v adim * 4) 2.88 3.2 3.52 v v scp scp comparator input range - 1.6 - 4.0 v t off propagation time for short current detection (2) v adim = 1v, v isen = 2.5 to 4v step v pdimo goes from high to low - - 250 ns line under voltage protection ( luvp ) v line line voltage protection - 1.73 1.85 1.97 v v lineh line voltage protection release voltage - - 2.05 - v t luvp luvp filtering time(2) - - 200 - ns r luvp luvp pull-down resistance - 250 500 1000 k auto restart protection ( ovp & scp ) t ar auto restart @ f osc = 200khz - 1 - ms boost diode open protection ( dop ) v diode_open diode open protection level on ovp pin rising voltage limit on ovp pin - 0.1 - v hysteresis, ? v diode_open - 0.05 - v power good indication C open drain (normal : open, abnormal : internal gnd) r pgood power good on resistance (2) v pgood = 0.1v - 10 - soft-start t ss time for internal soft-start @ f osc = 200khz - 10 - ms tsd t sd thermal shutdown temperature shutdown temperature - 150 - c hysteresis, ? t sd - 25 - note 1 : stress beyond the maximum ratings listed above ma y incur permanent damage to the device. operating a bove the recommended conditions for extended time may stress the device and affect device reliability. also the device may not operate normally above the recommended operating conditions. these are st ress ratings only. note 2 : these parameters, although guaranteed by design, are not tested in mass production.
confidential datasheet version 1.0 november 2012 page 8 MAP3232 C dual channel switch mode operating led dr iver typical operating characteristics unless otherwise noted, vcc = 12v, v pdimi = 5v operation current vs. temp quiescent current vs. temp vdd vs. temp ovp vs. temp scp vs. temp vref vs. temp
confidential datasheet version 1.0 november 2012 page 9 MAP3232 C dual channel switch mode operating led dr iver typical operating characteristics (continued) unless otherwise noted, vcc = 12v, v pdimi = 5v d op vs. temp luvp vs. temp vcs_max vs. temp
confidential datasheet version 1.0 november 2012 page 10 MAP3232 C dual channel switch mode operating led dr iver application information MAP3232 has an independent dual channel boost type led driver. so, it can be controlled independently. current mode boost switching regulator operation MAP3232 is being used current mode control scheme for boost regulation so its response is fast and output voltage is stable. supply voltage and oscillator MAP3232 has wide input voltage ranged from 8.5v to 36v . 1uf decoupling capacitor is used to stabilize the i nternal regulator and minimize noise on vcc pin. this decoup ling capacitor should be placed next to vcc pin. ceramic capacitor is recommended and incorrect placement of this decoupling capacitor may cause the oscillation in t he switching waveform MAP3232 is being operated at a djustable switching frequency.(100khz ~ 500khz) and max duty is 90%. the following is the equation to calculate frequenc y setting. ct rt s c ) 2000 + r( 7.1 = ) khz ( f we recommend r rt value is over 20kohm. this equation is for your reference. we need to som e modify value (r rt and c ct ) for actual board. led current input setting (adim input) MAP3232s led current is set by the voltage on adim pin and led sense resistor value as below. fig 1. schematic for led current set r _ sense _ current _ led v = i adim led the voltage range on adim pin is 0.1v ~ 3.0v. but it i s recommended that adim input voltage is higher than 0 .4v. the error amp input v offset is 5mv. if adim voltage use to below 0.4v, led current tolerance is increases. dimming pwm input MAP3232s pdimi signal is used for both enable and pwm dimming input. MAP3232 is enabled when pdimi voltage is higher than 2.0v and disabled when pdimi voltage is lower than 0.8v. this pin has internal 5 00kohm pull down resistance pwm input condition high (2.0v) enable low (0.8v) disable enable input MAP3232s offers an enable function. MAP3232 is enabled when en voltage is higher than 2.0v and disabled when en voltage is lower than 0.8v. this pi n has internal 500kohm pull down resistance en input condition high (2.0v) enable low (0.8v) disable protection MAP3232 has under voltage lock out (uvlo), boost switch current limit, output over voltage protection (ovp), line under voltage protection(luvp), led short current protection(scp), boost diode open protection (dop). when ovp and led scp are happened, MAP3232 monitors if the failure condition is released or no t every 1ms at fs 200khz. this is MAP3232s auto restart function. 1. under voltage lock out (uvlo) when vcc is higher than 8.0v, MAP3232s internal 5v regulator and internal circuitry like oscillator, p rotections, gate drivers and pdimo drivers are enabled, and the MAP3232 starts to operate when pdimi voltage and en signal are higher than 2.0v. if vcc is lower than 7.0v, MAP3232 is disable due to its under voltage lock out. 2. boost current limit and current sense (cs) MAP3232 has the boost current limit function. if the voltage on cs pin is higher than 0.47v (typ.), the gate pulse is limited every pulse. MAP3232 has 100ns (min. ) leading edge blank.
confidential datasheet version 1.0 november 2012 page 11 MAP3232 C dual channel switch mode operating led dr iver 3. output over voltage protection (ovp) when MAP3232s output voltage is increased abnormally , MAP3232 stops the switching to protect external components. MAP3232 has 200ns (typ.) low pass filter on ovp pin, but using external capacitor is recommended to minimize noise. the total values of r ovph and r ovpl need to be lower than 1mohm. ovp threshold voltage is 3.0v and ovp voltage can be set as below. - ovp set voltage : ovpl ovpl ovph o r r + r 0.3 = v - ovp release voltage : ovpl ovpl ovph o r r + r 7.2 = v 4. line under voltage protection (luvp) when line voltage is low voltage input, to prevent the stress of the transition for power component, MAP3232 stops the switching to protect external components. MAP3232 has 200ns (typ.) low pass filter on luvp pin, but using external capacitor is recommended to mini mize noise. the total values of r luvph and r luvpl need to be lower than 1mohm. luvp threshold voltage is 2.0v and luvp voltage can be set as below. - luvp set voltage : luvpl luvpl luvph in r r + r 8.1= v - luvp release voltage : luvpl luvpl luvph in r r + r 0.2 = v 5. led short current protection (scp) to protect external components, MAP3232 has the led short protection. if the led scp threshold voltage c hanges based on adim voltage as below, so if isen voltage is higher than led scp threshold voltage, MAP3232 will be in led scp mode disabling gate for boost mosfet and dimming mosfet. . fig 2. scp threshold voltage based on adim voltage 6. auto-restart protection the MAP3232 offers auto restart protection function which is recovered into normal operation mode when protection condition is cleared. the auto restart t ime (t ar ) is 1ms at fs 200khz. it is recovered to normal operating mode if scp or o vp condition is cleared. 7. boost diode open protection (dop) when ovp pin voltage is less than 0.1v, a correspond- -ing comparator turns off the external mosfet. this protects the driver from damage if the output boost diode is open (defective or poor solder contac t). 8. power good (pgood) MAP3232 has the pgood pin to send out the led current status. pgood will be high when the led current is higher than 70% of normal led current. 1) power good scheme at ovp protection. when ovp happens, pgood is low and latch immediately. pgood reset should be only shut down of ic vcc or en signal
confidential datasheet version 1.0 november 2012 page 12 MAP3232 C dual channel switch mode operating led dr iver 2) power good scheme at scp protection. when scp happens, pgood is low and latch immediately. pgood reset should be only shut down of ic vcc or en signal. 3) pgood pull up resistance is recommending over than 100kohm. inductor selection inductor value should be decided before system desi gn. because the selection of the inductor affects the op erating mode of ccm (continuous current mode) or dcm (discontinuous current mode), in ccm operation, ind uctor size should be bigger, even though the ripple current an d peak current of inductor can be small. in dcm operation, even ripple current and peak curr ent of inductor should be large while the inductor size ca n be smaller so that it is more effective in blu of tv and noteb ook application. the following is the equation to calculate max valu e of inductor. 2 t r d d)-1( = l (min) s (max) o 2 critical) ( where, r 0(max) = maximum output impedance t s(min) = minimum switching period l (inductance) > l (critical) ccm l (inductance) < l (critical) dcm out in v v -1= d , out out (max) o i v = r , s (min) s f 1 = t loop compensation the MAP3232 controls in current mode. current mode easily achieves compensation by consisting simple single p ole from double pole that lc filer makes at voltage mode in general, crossover frequency is selected from 1/ 3 ~ 1/6 range of the switching frequency. if fc is large, there i s possibility of oscillation to occur, although time response gets b etter. on the other hand, if fc is small, time response wi ll be bad, while it has improved stability, which may cause over sho ot or under shoot in abnormal condition.
confidential datasheet version 1.0 november 2012 page 13 MAP3232 C dual channel switch mode operating led dr iver physical dimensions magnachip semiconductor ltd. doesnt not recommend the use of its products in h ostile environments, including, without limitation, aircraft, nuclear power generation, medical applian ces, and devices or systems in which malfunction of any product can reasonably be expected to result in a personal injury. seller s customers using or selling sellers products for use in such applications do so at their own risk and agree to fully defend and indemn ify seller. magnachip reserves the right to change the specifications an d circuitry without notice at any time. magnachip does not consider responsibility for use of any circuitry other than circuitry entirely included in a magnachip product. is a registered trademark of magnachip semiconducto r ltd. magnachip semiconductor ltd. 891, daechi-dong, kangnam-gu, seo ul, 135-738 korea tel : 82-2-6903-3451 / fax : 82-2-6903-3668 ~9 www.magnachip.com
confidential datasheet version 1.0 november 2012 page 14 MAP3232 C dual channel switch mode operating led dr iver revision history date version changes 2012-11-20 version 0.0 initial release.

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