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mp3302 40v, 1.3a, single-cell step-up white led driver with single wire dimming control mp3302 rev. 0.98 www.monolithicpower.com 1 5/5/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. the future of analog ic technology description the mp3302 is a step-up converter designed for driving arrays of wleds from a single cell lithium ion battery. the mp3302 uses current mode, fixed frequency architecture to regulate the led current, which is measured through an external current sense resistor. its low 200mv feedback voltage reduces power loss and improves efficiency. the mp3302 is turned off if an over-voltage condition is present due to an open circuit condition. the mp3302 includes under-voltage lockout, current limiting and thermal overload protection preventing damage in the event of an output overload. the mp3302 is available in small 5-pin tsot23 and 8-pin qfn (2mm x 3mm) packages. features ? internal power mosfet ? drives up to 10 series white leds ? up to 87% efficiency ? single wire dimming control ? 1.3mhz fixed switching frequency ? open load shutdown ? low 200mv feedback voltage ? uvlo, thermal shutdown ? internal 1.3a current limit ? available in tsot23-5 and 2mm x 3mm qfn8 packages applications ? 5? ~ 7? lcd panels ? handheld computers and pdas ? digital still cameras ? small lcd displays ?monolithic power systems?, ?mps?, and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application mp3302 v in 3.3v - 6v enable/ dimming control led1 led2 led3 led25 led26 led27 in en gnd fb sw string 1 string 9 ... efficiency (%) 3 60 65 70 75 80 85 90 95 4 56 input voltage(v) 3 wleds,9 strings efficiency vs input voltage
mp3302 ?40v, 1.3a, single-cell step-up white led driver with single wire dimming control mp3302 rev. 0.98 www.monolithicpower.com 2 5/5/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. ordering information part number package top marking free air temperature (t a ) MP3302DJ * tsot23-5 n6 ?40 c to +85 c mp3302dd ** qfn8 (2mm x 3mm) n7 ?40 c to +85 c * for tape & reel, add suffix ?z (e.g. MP3302DJ?z); for rohs compliant packaging, add suffix ?lf (e.g. MP3302DJ?lf?z). ** for tape & reel, add suffix ?z (e.g. mp3302dd?z); for rohs compliant packaging, add suffix ?lf (e.g. mp3302dd?lf?z) package reference top view gnd in nc en 1 2 3 4 sw nc fb gnd 8 7 6 5 exposed pad connect to gnd tsot23-5 qfn8 (2mm x 3mm) absolute maxi mum ratings (1) sw pin.........................................?0.5v to +44v all other pins ..............................?0.3v to +6.5v continuous power dissipation?(t a = +25c) (2) tsot23-5 ................................................ 0.57w qfn8 (2mm x 3mm) ................................ 1.56w storage temperature.............. ?55 c to +150 c recommended operating conditions (3) in supply voltage ..............................2.5v to 6v sw pin ................................................v in to 36v operating junction temp. (t j )..... ?40 c to +125 c thermal resistance (4) ja jc tsot23-5.............................. 220 .... 110.. c/w qfn8 (2mm x 3mm) ............... 80 ...... 16... c/w notes: 1) exceeding these ratings may damage the device. 2) the maximum allowable power dissipation is a function of the maximum junction temperature t j (max), the junction-to- ambient thermal resistance ja , and the ambient temperature t a . the maximum allowable continuous power dissipation at any ambient temperature is calculated by p d (max) = (t j (max)-t a )/ ja . exceeding the maximum allowable powe r dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. internal thermal shutdown circuitry protects the device from permanent damage. 3) the device is not guaranteed to function outside of its operating conditions. 4) measured on approximately 1? square of 1 oz copper. sw gnd fb 1 2 3 5 4 in en top view
mp3302 ?40v, 1.3a, single-cell step-up white led driver with single wire dimming control mp3302 rev. 0.98 www.monolithicpower.com 3 5/5/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. electrical characteristics v in = v en = 5v, t a = +25 c, unless otherwise noted. parameters symbol condition min typ max units operating input voltage v in 2.5 6 v supply current (shutdown) v en = 0v 4 8 a supply current (quiescent) v fb = 0.15v 690 850 a switching frequency f sw 1.0 1.3 1.5 mhz maximum duty cycle v fb = 0v 92 % under voltage lockout in under voltage lockout uvlo v in rising 2.25 2.45 v under voltage lockout hysteresis 92 mv open lamp shutdown threshold v ov v ov rising 40 42 44 v enable en off threshold v en falling 0.4 v en on threshold v en rising 0.6 v minimum en dimming threshold v fb = 0v 0.655 0.7 0.845 v maximum en dimming threshold v fb = 0.2v 1.275 1.4 1.425 v feedback fb voltage v en = 1.5v 185 200 215 mv fb input bias current v fb = 0.1v -600 -300 na output switch sw on-resistance (5) r on 0.5 ? sw current limit (5) duty cycle = 60% 1.33 a thermal shutdown (5) 150 c notes: 5) guaranteed by design.
mp3302 ?40v, 1.3a, single-cell step-up white led driver with single wire dimming control mp3302 rev. 0.98 www.monolithicpower.com 4 5/5/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. pin functions tsot23-5 pin # qfn8 pin # name pin function 1 8 sw power switch output. sw is the drain of the internal mosfet switch. connect the power inductor and output rectif ier to sw. sw can swing between gnd and 36v. 2 1, 5 gnd, exposed pad ground. connect exposed pad to gnd plane for proper thermal performance. 3 6 fb feedback input. the mp3302 regulates the voltage across the current sense resistor between fb and gnd. connect a current sense resistor from the bottom of the led string to gnd. connec t the bottom of the led string to fb. the regulation voltage is 200mv. 4 4 en on/off control and dimming command input. a voltage greater than 0.6v will turn the part on and less than 0.4v will turn the part off. if the en pin voltage is between 0.7v and 1.4v, v fb is regulated between 0v and 200mv. to use pwm dimming, apply a 200hz to 1khz square wave signal with amplitude greater than 1.5v to this pin. 5 2 in input supply pin. must be locally bypassed. 3 nc no connect.
mp3302 ?40v, 1.3a, single-cell step-up white led driver with single wire dimming control mp3302 rev. 0.98 www.monolithicpower.com 5 5/5/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical performanc e characteristics v in = 5v, 3wleds 9strings, unless otherwise noted. v sw 10v/div. v en 2v/div. v out 5v/div. v en 2v/div. v en 5v/div. v out 5v/div. i led 100ma/div. enable startup v sw 10v/div. i led 100ma/div. v en 5v/div. v out 5v/div. v sw 10v/div. i led 100ma/div. enable shutdown pwm dimming v sw 20v/div. v out 20v/div. start up into openload v sw 10v/div. v fb 50mv/div. v out ac coupled 100mv/div. i inductor 500ma/div. 400ns/div. steady state operation v in = 5v, 3 wleds,9 strings v in = 5v, 3 wleds,9 strings v in = 5v, 3 wleds,9 strings v in = 5v v in = 5v, 3 wleds,9 strings f=1khz v in =5v, 3 wleds, 9 strings v in =5v, 3 wleds, 9 strings 0 0.2 0.4 0.8 1 pwm dimming duty output current vs pwm dimming duty 200 180 160 140 120 100 80 60 40 20 output current (ma) output current (ma) 0.6 0 200 180 160 140 120 100 80 60 40 20 0 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 en pin voltage (v) output current vs analog dimming voltage efficiency (%) 3 60 65 70 75 80 85 90 95 4 56 input voltage(v) 3 wleds,9 strings 6 wleds 8 wleds 10wleds efficiency vs input voltage
mp3302 ?40v, 1.3a, single-cell step-up white led driver with single wire dimming control mp3302 rev. 0.98 www.monolithicpower.com 6 5/5/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. operation the mp3302 uses a constant frequency, peak current mode boost regulator architecture to regulate the series string of white leds. the operation of the mp3302 can be understood by referring to the block diagram of figure 1. at the start of each oscillator cycle the fet is turned on through the control circuitry. to prevent sub-harmonic oscillations at duty cycles greater than 50 percent, a stabilizing ramp is added to the output of the current sense amplifier and the result is fed into the positive input of the pwm comparator. when this voltage equals the output voltage of the error amplifier the power fet is turned off. the voltage at the output of the error amplifier is an amplified version of the difference between the 200mv reference voltage and the feedback voltage. in this way the peak current level keeps the output in regulation. if the feedback voltage starts to drop, the output of the error amplifier increases. this results in more current flowing through the power fet, thus increasing the power delivered to the output. pwm comparator amplifier 200mv for full brightness enable control logic current sense amplifier sw m1 gnd - + fb en 1.3mhz osc enable & dimming control - + + - + figure 1?functional block diagram
mp3302 ?40v, 1.3a, single-cell step-up white led driver with single wire dimming control mp3302 rev. 0.98 www.monolithicpower.com 7 5/5/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. application information enable/ dimming control mp3302 v in 3.3v to 6v mbr0520 4.7uh c2 0.47uf c1 10uf in en gnd fb sw figure 2?circuit for driving 9 strings of 3 wleds a typical application circuit can be seen in figure 2. the 9 strings of 3 white leds can be driven from a voltage supply range of 3.3v to 6v at an output current of 180ma. a 0.47f output capacitor is sufficient for most applications. a 4.7h inductor with low dcr (inductor dc resistance) is recommended to improve efficiency. a 10f ceramic capacitor is recommended for the input capacitance in the real system. schottky diodes have fast recovery and a low forward voltage and are recommended. schottky diodes rated with 500ma are sufficient for the mp3302. the mp3302 has internal soft-start to limit the amount of current through vin at startup and to also limit the amount of overshoot on the output. the ramped voltage that is added to the current sense amplifier reduces the current output as the duty cycle increases. as more leds are added, the output voltage rises but the current that can be delivered to the load is reduced as well. setting the led current the led current is controlled by the feedback resistor, r1. the current through the leds is given by the equation 200mv/r1. table 1 shows the selection of resistors for a given led current. table 1?i led vs. r1 i led (ma) r1 ( ? ) 1 200 5 40 10 20 20 10 60 3.33 180 1.11
mp3302 ?40v, 1.3a, single-cell step-up white led driver with single wire dimming control mp3302 rev. 0.98 www.monolithicpower.com 8 5/5/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. led current programming applying a dc voltage between 0.7v and 1.4v to en pin programs a feedback voltage between 0v and 200mv. thus the analog dimming of led current can be achieved. the dc dimming voltage must be locally bypassed to prevent noise interfering with the feedback reference level. pwm dimming apply a 200hz to 1khz square waveform to the en pin to implement pwm dimming of the leds. the minimum recommended amplitude of the pwm signal is 1.5v. for high frequency pwm dimming (>1khz), it is also recommended that the dimming control be implemented as shown in figure 3. the cut off frequency of the rc filter should be 10 times lower than that of the input pwm signal. for example, when the pwm frequency is 20khz, a 20k ? resistor and 100nf capacitor can be used. the dc voltage on en pin is then equal to the pwm high level voltage multiplies the pwm duty . the dc voltage from 0.7v to 1.4v programs the output current from 0~100%. pwm mp3302 led1 led2 led3 fb en figure 3?high frequency pwm dimming control open load protection open load protection will shut off the mp3302 if the output voltage goes too high. in some cases an led may fail, this will result in the feedback voltage always being zero. the part will run at maximum duty cycle boosting the output voltage higher and higher. if the output ever exceeds 42v, the mp3302 will shut down. the part will not switch again until the power is recycled. layout considerations careful attention must be paid to the pcb board layout and components placement. proper layout of the high frequency switching path is critical to prevent noise and electromagnetic interference problems. the current loop of ic, output diode, and output capacitor should be as short as possible. the in pin of the ic must be locally bypassed. a rc filter is highly recommended for eliminating the noise on in pin. it could be implemented as shown in figure 4. mp3302 sw gnd in input figure 4?input bias filtering
mp3302 ?40v, 1.3a, single-cell step-up white led driver with single wire dimming control mp3302 rev. 0.98 www.monolithicpower.com 9 5/5/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical application circuits mp3302 sw in fb gnd en led+ led- c4 330nf 50v d2 5.6v zener d1 b0540 l1 4.7uh/1a optional bias circuit gnd en vin 3.3v -18v c1 4.7uf 16v c3 0.1uf 50v 1 28 6 4 figure 5 ? driving 27 wleds (9 wleds in series and 3 strings paralleled) with 3.3v D 18v input voltage in order to improve the mosfet on-resistance at low input voltage and make the chip compatible for high input voltage, the additional bias circuit should be used. mp3302 sw in fb gnd en gnd en led+ led- vin 4.5v-16v c1 4.7uf 16v c4 0.47uf 25v l2 4.7uh/1a c3 0.1uf 25v q2 2n3904 d2 5.6v zener required bias circuit for high input voltage l1 c5 d1 4.7uh/1a 2.2uf/25v b0530 8 2 4 1 6 figure 6 ? wide input voltage sepic converter for 27 wleds ( 3 wleds in series and 9 strings paralleled )
mp3302 ?40v, 1.3a, single-cell step-up white led driver with single wire dimming control mp3302 rev. 0.98 www.monolithicpower.com 10 5/5/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. mp3302 sw in fb gnd en c3 r1 r2 d1 b0540 l1 led1 led2 led3 led4 led5 led6 led7 led8 led9 led10 gnd en vin 3v-6v c1 16v c2 16v 1 28 6 4 1% figure 7 ? driving 10 wleds in series with 3v?6v input voltage mp3302 sw in fb gnd en wled+ wled- c4 50v r1 d2 zener diode d1 b0530f l1 a gnd en vin c1 16v c2 16v c3 25v 1 28 6 4 figure 8 ? driving 27 wleds (3 wleds in series and 9 strings) with 3 v input voltage
mp3302 ?40v, 1.3a, single-cell step-up white led driver with single wire dimming control mp3302 rev. 0.98 www.monolithicpower.com 11 5/5/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. package information tsot23-5 0.30 0.50 seating plane 0.95 bsc 0.84 0.90 1.00 max 0.00 0.10 top view front view side view recommended land pattern 2.80 3.00 1.50 1.70 2.60 3.00 1 3 4 5 0.09 0.20 note: 1) all dimensions are in millimeters. 2) package length does not include mold flash, protrusion or gate burr. 3) package width does not include interlead flash or protrusion. 4) lead coplanarity (bottom of leads after forming) shall be 0.10 millimeters max. 5) drawing conforms to je dec mo-193, variation aa. 6) drawing is not to scale. 0.30 0.50 0 o -8 o 0.25 bsc gauge plane 2.60 typ 1.20 typ 0.95 bsc 0.60 typ see detail "a" detail ?a?
mp3302 ?40v, 1.3a, single-cell step-up white led driver with single wire dimming control notice: the information in this document is subject to change wi thout notice. users should warra nt and guarantee that third party intellectual property rights are not infringed upon w hen integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp3302 rev. 0.98 www.monolithicpower.com 12 5/5/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. qfn8 (2mm x 3mm) side view top view bottom view 2.90 3.10 1.90 2.10 0.00 0.05 pin 1 id marking 1.70 0.50 0.25 recommended land pattern 2.90 note: 1) all dimensions are in millimeters. 2) exposed paddle size does not include mold flash. 3) lead coplanarity shall be 0.10 millimeter max. 4) drawing conforms to jedec mo-229, variation vced-2. 5) drawing is not to scale. 1.60 0.70 pin 1 id option b r0.20 typ. detail a pin 1 id index area 1 8 5 4 1.65 1.85 1.50 1.70 0.50 bsc 0.18 0.30 pin 1 id see detail a 0.30 0.50 0.80 1.00 0.20 ref pin 1 id option a 0.30x45? typ.

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