ver: 0.5 sep 25, 2013 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5719B global mixed-mode technology 1mhz, 3a synchronous step-down regulator features ? high efficiency: up to 95% ? low quiescent current: only 50 a during opera- tion ? internal soft start function ? output current G5719Btb1u: 2a continuous, 3a peak G5719Brc1u: 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 G5719B is a high efficiency monolithic synchronous buck regulator using a cons tant 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 G5719B ideally suited for single li-ion battery-powered applications. 100% duty cycle pro- vides low dropout operation, ex tending battery run time in portable systems. switching fr equency is internally set at 1mhz, allowing the use of sm all surface mount inductors and capacitors. the internal synchronous switch increase efficiency 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 damage under short circuit and overvoltage conditions. ordering information order number marking output voltage temp. range package (green) G5719Bt11u 519bx adjustable -40 c to +85 c sot-23-5 G5719Btb1u 519bx adjustable -40 c to +85 c sot-23-6 G5719Brc1u 519b adjustable -40 c to +85 c tdfn2x2-8 note: t1: sot-23-5 tb: sot-23-6 rc: tdfn2x2-8 1: bonding code u: tape & reel pin configuration typical application circuit vin lx en vfb gnd G5719B 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 G5719B pg 5 r 10k pg v in tdfn2x2-8 1 2 3 4 8 7 6 5 thermal pad G5719B 1 2 3 4 8 7 6 5 thermal pad vfb pg vin gnd gnd en lx nc vfb vin sot-23-5 4 1 en 2 3 gnd lx G5719B 5 vin lx en vfb gnd G5719B 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 v out = 0.6v ? (1+ ) r1 r2 vfb vin sot-23-6 6 4 1 en 2 3 gnd lx G5719B pg 5 r 10k pg v in tdfn2x2-8 1 2 3 4 8 7 6 5 thermal pad G5719B 1 2 3 4 8 7 6 5 thermal pad vfb pg vin gnd gnd en lx nc vfb vin sot-23-5 4 1 en 2 3 gnd lx G5719B 5
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