ver: 0.4 jan 28, 2010 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5904 global mixed-mode technology inc. four channel high efficiency white led driver features ? dynamic 1x/2x charge pump switching ? up to 80ma (20ma/led) drive capability ? 90% average efficiency ? 0.5% (typ) led current matching ? wide current range per led [0.1ma ~ 20ma] ? single wire en/brightness control ? 2.7v to 5.5v supply voltage range ? < 1 a shutdown current ? output over-voltage protection ? open/short led protection ? thermal shutdown protection ? tdfn2.5x2.5-10 and tqfn3x3-16 package applications ? mobile phones ? white led backlighting ? camera flash led lighting general description the G5904 charge pump drives up to four white leds with regulated constant current for uniform intensity. by utilizing dynamic 1x/2x charge-pump modes and ultra-low-dropout current regulators, it achieves high efficiency over the 1-cell lithium battery input voltage range. the 250khz fixed frequency switching allows for tiny external components, and the regulation scheme is optimized to ensure low emi and low input ripple. the G5904 uses a single wire en/brightness control to enable, disable, and set the led current with 16-linear steps down to 100 a. once the desired led brightness is set, the G5904 maintains constant led current as long as en pin is kept high. if en pin kept low for 90 s, the G5904 enters shutdown. the short-circuit, over-voltage, and thermal protection are also included. the soft start is enabled to reduce the inrush current during power on and pump mode transformed. ordering information order number marking temp. range package (green) G5904rm1u 5904 -40 c~ +85 c tdfn2.5x2.5-10 G5904r41u 5904 -40 c~ +85 c tqfn3x3-16 note: rm: tdfn2.5x2.5-10 r4: tqfn3x3-16 1: bonding code u: tape & reel pin configuration typical application circuit G5904 tqfn3x3-16 n.c. n.c. n.c. vin gnd 1 2 3 4 en 12 11 10 9 c1p c1n n.c. 16 15 14 13 led2 led1 5 6 7 8 n.c. n.c. vout thermal pad led3 led4 vout en vin led1 gnd c1 1 f c1n c1p c out 1 f led2 led3 led4 battery c in 1 f high low tdfn2.5x2.5-10 4 G5904 1 2 3 8 7 6 thermal pad gnd c1n c1p en vin led4 vout 5 9 10 led2 led3 led1 G5904 tqfn3x3-16 n.c. n.c. n.c. vin gnd 1 2 3 4 en 12 11 10 9 c1p c1n n.c. 16 15 14 13 led2 led1 5 6 7 8 n.c. n.c. vout thermal pad led3 led4 vout en vin led1 gnd c1 1 f c1n c1p c out 1 f led2 led3 led4 battery c in 1 f high low tdfn2.5x2.5-10 4 G5904 1 2 3 8 7 6 thermal pad gnd c1n c1p en vin led4 vout 5 9 10 led2 led3 led1
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