ver: 0.3 aug 30, 2010 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5698 global mixed-mode technology inc. 1.2mhz, 1.2a synchronous step-down regulator features ? high efficiency: up to 95% ? low quiescent current: only 50 a during op- eration ? internal soft start function ? 1.2a 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 ? 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 G5698 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 G5698 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 1.2mhz, 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) G5698adjre1u 5698a adjustable -40 c~ +85 c tdfn3x3-10 for other output voltage, please contact us at sales @ gmt.com.tw note: re: tdfn3x3-10 1: bonding code u: tape & reel pin configuration typical application circuit vin lx en v fb gnd G5698 c in 2.2 f cer v in 5v 2.2 h c fb r1 80k r2 18 k c out 10 f cer v out 3.3v 1.2a * (option) v ou t = 0.6v ? (1+ ) r1 r2 note: recomm end co nne ctin g the th erma l pad to the gnd or let it keep floating. tdfn3x3-10 4 G5698 1 2 3 8 7 6 nc nc 5 9 10 gnd tdfn3x3-10 4 1 2 3 8 7 6 vin en nc pgnd lx 5 9 10 vfb nc thermal pad vin lx en v fb gnd G5698 c in 2.2 f cer v in 5v 2.2 h c fb r1 80k r2 18 k c out 10 f cer v out 3.3v 1.2a * (option) v ou t = 0.6v ? (1+ ) r1 r2 v ou t = 0.6v ? (1+ ) r1 r2 note: recomm end co nne ctin g the th erma l pad to the gnd or let it keep floating. tdfn3x3-10 4 G5698 1 2 3 8 7 6 nc nc 5 9 10 gnd tdfn3x3-10 4 1 2 3 8 7 6 vin en nc pgnd lx 5 9 10 vfb nc thermal pad
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