ver: 0.7 jul 12, 2013 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5728B global mixed-mode technology 1.4mhz 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 ? 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 ? 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 G5728B is a high efficiency monolithic synchro- nous buck regulator using a constant frequency, cur- rent mode architecture. supply current during opera- tion is only 50 a and drops to <1 a in shutdown. the 2.5v to 6v input voltage range makes the G5728B ideally suited for single li-ion battery-powered applica- tions. 100% duty cycle provides low dropout operation, extending battery run time in portable systems. switching frequency is internally set at 1.4mhz, allow- ing the use of small surface mount inductors and ca- pacitors. 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 (v) temp. range package (green) G5728Bt11u 578bx adjustable -40 c~ +85 c sot-23-5 G5728Bto1u 578bx adjustable -40 c~ +85 c tsot-23-5 G5728B-12to1u 578dx 1.2 -40 c~ +85 c tsot-23-5 G5728Bu51d 578b adjustable -40 c~ +85 c wdfn2x2-6 note: t1: sot-23-5 to:tsot-23-5 u5:wdfn2x2-6 1: bonding code u&d: tape & reel pin configuration typical application circuit vfb vin sot-23-5/tsot-23-5 5 4 1 en 2 3 gnd lx G5728B vin lx en vfb gnd G5728B 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 * r2 Q 20k for stability consideration. 1 2 3 6 5 4 7 gnd gnd vfb vin lx en gnd G5728B wdfn2x2-6 vfb vin sot-23-5/tsot-23-5 5 4 1 en 2 3 gnd lx G5728B vin lx en vfb gnd G5728B 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 * r2 Q 20k for stability consideration. 1 2 3 6 5 4 7 gnd gnd vfb vin lx en gnd G5728B wdfn2x2-6
ver: 0.1 aug 17, 2012 tel: 886-3-5788833 http://www.gmt.com.tw 1 g5728c global mixed-mode technology 1.4mhz 1a synchronous step-down regulator features ? high efficiency: up to 93% ? 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 ? 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 g5728c is a high efficiency monolithic synchro- nous buck regulator using a constant frequency, cur- rent mode architecture. the 2.5v to 6v input voltage range makes the g5728c ideally suited for single li-ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery run time in portable systems. switching frequency is in- ternally set at 1.4mhz, allowing the use of small sur- face 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) g5728cto1u 578cx adjustable -40 c~ +85 c tsot-23-5 note: to:tsot-23-5 1: bonding code u: tape & reel pin configuration typical application circuit vfb vin tsot-23-5 5 4 1 en 2 3 gnd lx g5728c vin lx en vfb gnd g5728c 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 * r2 Q 20k for stability consideration. vfb vin tsot-23-5 5 4 1 en 2 3 gnd lx g5728c vin lx en vfb gnd g5728c 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 * r2 Q 20k for stability consideration.
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