ver: 1.1 may 27, 2013 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5728 global mixed-mode technology 1mhz 1a synchronous step-down regulator features ? 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 ? 1mhz 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 ? over temperature protected ? rohs compliant applications ? cellular telephones ? personal information appliances ? microprocessors and dsp core supplies ? wireless and dsl modems ? digital still and video cameras ? mp3 players ? portable instruments general description the G5728 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. supply current during operation is only 50 a and drops to <1 a in shutdown. the 2.5v to 6v input voltage range makes the G5728 ideally suited for single li-ion battery-powered applications. 100% duty cycle provides low dropout operation, ex- tending battery run time in portable systems. switching frequency is internally set at 1mhz, allowing the use of small surface mount inductors and capacitors. the internal synchronous switch increase efficiency and eliminates the need for an external schottky diode. built-in soft start function eliminates in-rush current that could damage the system. ordering information order number marking output voltage temp. range package (green) G5728to1u 5728x adjustable -40 c~ +85 c tsot-23-5 G5728t11u 5728x adjustable -40 c~ +85 c sot-23-5 note: to:tsot-23-5 t1:sot-23-5 1: bonding code u: tape & reel pin configuration typical application circuit vfb vin tsot-23-5/sot-23-5 5 4 1 en 2 3 gnd lx G5728 vin lx en vfb gnd G5728 c in 2.2 f cer v in 4~6v 1 43 5 2.2 h c fb r1 82k r2 18k c out 10 f cer v out 3.3v 300ma * (option) v out = 0.6v (1+ ) r1 r2 2 vfb vin tsot-23-5/sot-23-5 5 4 1 en 2 3 gnd lx G5728 vin lx en vfb gnd G5728 c in 2.2 f cer v in 4~6v 1 43 5 2.2 h c fb r1 82k r2 18k c out 10 f cer v out 3.3v 300ma * (option) v out = 0.6v (1+ ) r1 r2 v out = 0.6v (1+ ) r1 r2 2
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