ver: 0.1 aug 23, 2012 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5723B global mixed-mode technology 1.4mhz 1a synchronous buck converter with 600ma ldo regulator features buck converter ? high efficiency: up to 93% ? low quiescent current: only 50 a during op- eration ? internal soft start function ? 1a output current ? 2.5v to 6v input voltage range ? 1.4mhz switching frequency ? no schottky diode required ? 100% duty cycle in dropout operation ? 0.6v reference allows low output voltages ? <1 a shutdown current ? current mode operation for excellent line and load transient response ldo regulator ? dropout voltage typically 0.65v @ i o = 600ma ? output current in excess of 600ma ? output voltage accuracy 2% ? quiescent current, typically 0.3ma ? internal short circuit current limit ? internal over temperature protection applications ? digital still and video cameras ? mp3 players ? portable instruments general description the G5723B consists of a synchronous step-down dc/dc converter and a ldo regulator. the dc/dc converter is operated on current mode architecture. switching frequency is set at 1.4mhz allowing the use of small surface mount inductor and capacitor. the internal synchronous switches increase efficiency and eliminate the need for external schottky diode. ordering information order number marking voltage temp. range package (green) G5723B-33f11u G5723B-33 3.3v -40 c to +85 c sop-8 (fd) G5723B-33f61u G5723B-33 3.3v -40 c to +85 c msop-10 (fd) note:f1: sop-8 (fd) f6: msop-10 (fd) 1: bonding code u: tape & reel pin configuration typical application circuit v out1 = 0.6v (1+ ) r1 r2 in1 lx en1 fb1 G5723B c in1 2.2 f v in 5v 2.2 h c fb r1 18k r2 18k c out1 10 f v out1 1.2v 1a * (option) c out2 4.7 f in2 out2 v out2 c in2 1 f agnd pgnd fb1 10 8 7 1 2 3 4 en1 agnd agnd lx pgnd in1 out2 msop-10 (fd) G5723B 9 6 5 nc in2 sop-8 (fd) G5723B fb1 8 6 5 1 2 3 4 en1 agnd agnd lx in1 out2 in2 7 thermal pad 9. pgnd note: recommend connecting the thermal pad to the ground for excellent power dissipation. thermal pad v out1 = 0.6v (1+ ) r1 r2 v out1 = 0.6v (1+ ) r1 r2 in1 lx en1 fb1 G5723B c in1 2.2 f v in 5v 2.2 h c fb r1 18k r2 18k c out1 10 f v out1 1.2v 1a * (option) c out2 4.7 f in2 out2 v out2 c in2 1 f agnd pgnd fb1 10 8 7 1 2 3 4 en1 agnd agnd lx pgnd in1 out2 msop-10 (fd) G5723B 9 6 5 nc in2 sop-8 (fd) G5723B fb1 8 6 5 1 2 3 4 en1 agnd agnd lx in1 out2 in2 7 thermal pad 9. pgnd note: recommend connecting the thermal pad to the ground for excellent power dissipation. thermal pad
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