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| ver: 0.4 aug 30, 2010 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5723 global mixed-mode technology inc. synchronous buck converter with low-noise ldo regulator features buck converter ? high efficiency: up to 95% ? low quiescent current: only 50 a during op- eration ? internal soft start function ? 600ma output current ? 2.5v to 6v input voltage range ? 1.2mhz 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 ? ultra low output noise 30 v (rms) ? ultra low 55 a no-load supply current ? ultra low dropout 70mv @ 50ma load ? guarantee 300ma output current ? fixed mode: no external resistor network needed ? max. supply current in shutdown mode < 1 a ? stable with low cost ceramic capacitors ? over temperature protected ? rohs compliant applications ? digital still and video cameras ? mp3 players ? portable instruments general description the G5723 consists of a synchronous step-down dc/dc converter and a low-noise ldo regulator. the dc/dc converter is operated on current mode archi- tecture. switching frequency is set at 1.2mhz allowing the use of small surface mount inductor and capacitor. the internal synchronous switches increase efficiency and eliminate the need for external schottky diode. it is ideal for system powered by a 1-cell li-ion battery. ordering information order number marking voltage temp. range package (green) G5723-18p71u g 5723g 1.8v -40 c to +85 c msop-10 G5723-30p71u g 5723e 3.0v -40 c to +85 c msop-10 G5723-33p71u g 5723f 3.3v -40 c to +85 c msop-10 note: p7: msop-10 1: bonding code u: tape & reel pin configuration typical application circuit v out1 = 0.6v (1+ ) r1 r2 in1 lx en1 fb1 G5723 c in1 2.2 f v in 3.3~4.2v 2.2 h c fb r1 18k r2 18k c out1 10 f v out1 1.2v 600ma * (option) c out2 4.7 f in2 en2 out2 v out2 c in2 1 f battery agnd pgnd fb1 10 8 7 1 2 3 4 en1 agnd agnd lx pgnd in1 out2 msop-10 G5723 9 6 5 en2 in2 v out1 = 0.6v (1+ ) r1 r2 v out1 = 0.6v (1+ ) r1 r2 in1 lx en1 fb1 G5723 c in1 2.2 f v in 3.3~4.2v 2.2 h c fb r1 18k r2 18k c out1 10 f v out1 1.2v 600ma * (option) c out2 4.7 f in2 en2 out2 v out2 c in2 1 f battery agnd pgnd fb1 10 8 7 1 2 3 4 en1 agnd agnd lx pgnd in1 out2 msop-10 G5723 9 6 5 en2 in2
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