ver: 0.1 feb 20, 2014 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5719C global mixed-mode technology 1mhz, 3a synchronous step-down regulator features ? high efficiency: up to 95% ? low quiescent current: only 50 a during op- eration ? internal soft start function ? output current G5719Ctb1u: 2a continuous, 3a peak G5719Crc1u: 3a continuous ? 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 ? power good ? output short circuit latch-off protection ? output overvoltage latch-off protection 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 G5719C 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 G5719C 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 1mhz, allowing the use of small surface mount inductors and capaci- tors. the internal synchronous switch increase effi- ciency and eliminates the need for an external schot- tky diode. built-in soft start function eliminates in-rush current that could damage the system. output latch-off operation protects the step-down regulator from dam- age under short circuit and overvoltage conditions. ordering information order number marking output voltage temp. range package (green) G5719Ctb1u 519cx adjustable -40 c to +85 c sot-23-6 G5719Crc1u 519c adjustable -40 c to +85 c tdfn2x2-8 note: tb: sot-23-6 rc: tdfn2x2-8 1: bonding code u: tape & reel pin configuration typical application circuit vin lx en vfb gnd G5719C c in 2.2 f cer v in 4~6v 2.2 h c fb r1 82k r2 18k c out 10 f cer v out 3.3v 2a * (option) v out = 0.6v ( 1+ ) r1 r2 vfb vin sot-23-6 6 4 1 en 2 3 gnd lx G5719C pg 5 r 10k pg v in tdfn2x2-8 1 2 3 4 8 7 6 5 thermal pad G5719C 1 2 3 4 8 7 6 5 thermal pad vfb pg vin gnd gnd en lx nc vin lx en vfb gnd G5719C c in 2.2 f cer v in 4~6v 2.2 h c fb r1 82k r2 18k c out 10 f cer v out 3.3v 2a * (option) v out = 0.6v ( 1+ ) r1 r2 vfb vin sot-23-6 6 4 1 en 2 3 gnd lx G5719C pg 5 r 10k pg v in tdfn2x2-8 1 2 3 4 8 7 6 5 thermal pad G5719C 1 2 3 4 8 7 6 5 thermal pad vfb pg vin gnd gnd en lx nc
|
