EV0042 1x, 1.5x, 2x high efficiency charge pump 4 white led driver evaluation board EV0042 rev. 1.5 www.monolithicpower.com 1 10/27/2005 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2005 mps. all rights reserved. the future of analog ic technology tm tm general description the EV0042 is an evaluation board for the mp1519, a fully automatic driver for powering four white leds, with up to 4v forward voltage, from a single li-ion or three nimh cells. the driver performs all of the sensing and control to run the leds at an optimum charge pump ratio for efficiency without an expensive inductor. the driver allows pwm operation to support brightness control. the tiny 3mm x 3mm qfn16 package and small external capacitors allow for the most compact white led solution available. electrical specifications parameter symbol value units # of wleds 4 input voltage v in 2.5 ? 5.5 v led current i led 20 ma features ? 2% led current matching ? high efficiency (>93%) ? current source outputs ? no ballast resistors required ? 1x, 1.5x and 2x automatic modes ? constant frequency operation ? automatic led detection ? high and low frequency pwm capability ? 2.5v to 5.5v operation ? less than 1 a leakage during shutdown ? detects changes in battery level ? no external schottky diode required ? soft-start and soft switching operation applications ? cell phones ? pda or hand held computers ? white led application at 3.6v supply ?mps? and ?the future of analog ic technology? are trademarks of monolithic power systems, inc. EV0042 evaluation board (l x w x h) 2.4? x 1.9? x 0.4? (6.1cm x 4.8cm x 1.0cm) board number mps ic number EV0042 mp1519dq 100 90 80 70 60 50 40 30 20 10 0 efficiency (%) 2.5 3.0 3.5 4.0 4.5 supply voltage (v) mp1519-ec01 efficiency vs supply voltage v led = 3.35v @ 20ma i led =20ma i led =10ma i led =5ma
EV0042 ? 1x, 1.5x, 2x charge pump 4 white led driver ev board EV0042 rev. 1.5 www.monolithicpower.com 2 10/27/2005 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2005 mps. all rights reserved. tm evaluation board schematic mp1519 c2b gnd radj en 16 u1 15 14 13 12 1 3 2 4 11 10 9 5678 batt led1 led2 led3 led4 nc gnd c1a batt c2a c1b ledc vin tp1 led2 led3 led4 gnd en EV0042_s01 led1 note: attach the exposed pad to the ledc pin. EV0042 bill of materials qty ref value description package manufacturer: part no. distributor: part no. 2 c1, c2 1 f ceramic capacitor, 10v, x5r 0805 tdk: c2012x5r1a105k digikey: 445-1360-1-nd 2 c3, c4 4.7 f ceramic capacitor, 6.3v, x5r 0805 tdk: c2012x5r0j475k digikey: 445-1421-1-nd 4 led1, led2, led3, led4 not stuffed 1 r1 1.54k ? resistor, 1% 0805 panasonic: erj-6enf1541v digikey: p1.54kcct-nd 1 r2 100k ? resistor, 5% 0805 panasonic: erj-6geyj104v digikey: p100kact-nd 4 r3, r4, r5, r6 0 ? resistor, 5% 0805 yageo: 9c08052a0r00jlhft digikey: 311-0.0act-nd 1 u1 white led driver mps: mp1519dq
EV0042 ? 1x, 1.5x, 2x charge pump 4 white led driver ev board notice: the information in this document is subject to change wi thout notice. please contact mps for current specifications. users should warrant and guarantee that third party intellectual property rights ar e not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. EV0042 rev. 1.5 www.monolithicpower.com 3 10/27/2005 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2005 mps. all rights reserved. tm printed circuit board layout figure 1?top silk layer figure 2?top layer figure 4?bottom layer quick start guide 1. solder led1 - led4 to the board. 2. attach the positive and negatives terminals of the power supply (2.5v ? 5.5v) to the vin and gnd pins, respectively. 3. the board is set up for automatic startup. drive en low to shut down the mp1519. 4. to use burst mode brightness control, drive en with a pwm signal.
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