ver: 0.5 aug 03, 2009 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5656 global mixed-mode technology inc. 3a step-down dc/dc features ? 3a output current ? 0.15 internal power mosfet switch ? stable with low esr output ceramic capaci- tors ? up to 95% efficiency ? 25 a shutdown mode ? fixed 380khz frequency ? thermal shutdown ? cycle-by-cycle over current protection ? wide 4.75v to 20v operating input range ? output adjustable from 1.22v to 12v ? available in sop-8 (fd) package applications ? pc monitors ? dsl modems ? distributed power systems ? pre-regulator for linear regulators general description the G5656 is a monolithic step-down switch mode regulator with a built in internal power mosfet. it achieves 3a continuous output current over a wide input supply range with excellent load and line regula- tion. current mode operation provides fast transient re- sponse and eases loop stabilization. fault condition protection includes cycle-by-cycle cur- rent limiting, output short circuit protection and thermal shutdown. in shutdown mode the regulator draws 25 a of supply current. programmable soft-start over- writes the internal soft-start for various requirement of output power up ramp and minimizes the inrush supply current at initial startup. the G5656 requires a minimum number of readily available standard external components. it is available in a sop-8 (fd) package. ordering information order number marking temp. range package (green) G5656f11u G5656 -40 c to +85 c sop-8 (fd) G5656f12u G5656a -40 c to +85 c sop-8 (fd) note: f1: sop-8 (fd) 1 & 2: bonding code u : tape & reel pin configuration typical application circuit en comp fb lx gnd v in 4.75v~20v d1 ss34 10 h r1/28k r2/16k c c2 optional in c c 22 f mlcc v out 3.3v/3a 10 f r c G5656 on off v out = 1.22v x ( 1 + ) r1 r2 en comp fb lx gnd d1 ss34 10 h r1/28k r2/16k in 0.1 f v out 3.3v/3a G5656 100 f/220 f electrolytic v in 4.75v~20v c c2 c c 10 f r c on off ss 0.1 f ss 0.1 f sop-8 (fd) G5656f11u lx 8 6 5 1 2 3 4 nc in gnd ss en comp fb 7 thermal pad note: recommend connecting the thermal pad to the ground for excellent power dissipation. sop-8 (fd) G5656f12u in 8 6 5 1 2 3 4 ss nc lx en comp fb gnd 7 thermal pad en comp fb lx gnd v in 4.75v~20v d1 ss34 10 h r1/28k r2/16k c c2 optional in c c 22 f mlcc v out 3.3v/3a 10 f r c G5656 on off on off v out = 1.22v x ( 1 + ) r1 r2 en comp fb lx gnd d1 ss34 10 h r1/28k r2/16k in 0.1 f v out 3.3v/3a G5656 100 f/220 f electrolytic v in 4.75v~20v c c2 c c 10 f r c on off on off ss 0.1 f ss 0.1 f ss 0.1 f ss 0.1 f sop-8 (fd) G5656f11u lx 8 6 5 1 2 3 4 nc in gnd ss en comp fb 7 thermal pad lx 8 6 5 1 2 3 4 nc in gnd ss en comp fb 7 thermal pad note: recommend connecting the thermal pad to the ground for excellent power dissipation. sop-8 (fd) G5656f12u in 8 6 5 1 2 3 4 ss nc lx en comp fb gnd 7 thermal pad in 8 6 5 1 2 3 4 ss nc lx en comp fb gnd 7 thermal pad
ver: 0.4 aug 03, 2009 tel: 886-3-5788833 http://www.gmt.com.tw 1 g5657 global mixed-mode technology inc. 3a step-down dc/dc features ? 3a output current ? 0.15 internal power mosfet switch ? stable with low esr output ceramic capaci- tors ? up to 95% efficiency ? 25 a shutdown mode ? fixed 380khz frequency ? thermal shutdown ? cycle-by-cycle over current protection ? wide 4.75v to 20v operating input range ? output adjustable from 0.92v to 12v ? available in sop-8(fd) package applications ? pc monitors ? dsl modems ? distributed power systems ? pre-regulator for linear regulators general description the g5657 is a monolithic step-down switch mode regulator with a built in internal power mosfet. it achieves 3a continuous output current over a wide in- put supply range with excellent load and line regulation. current mode operation provides fast transient re- sponse ans eases loop stabilization. fault condition protection includes cycle-by-cycle cur- rent limiting, output short circuit protection and thermal shutdown. in shutdown mode the regulator draws 25 a of supply current. programmable soft-start overwrites the internal soft-start for various requirement of output power up ramp and minimizes the inrush supply current at initial startup. the g5657 requires a minimum number of readily available standard external components. it is available in a sop-8 (fd) package. ordering information order number marking temp. range package (green) g5657f11u g5657 -40 c to +85 c sop-8 (fd) g5657f12u g5657a -40 c to +85 c sop-8 (fd) note: f1: sop-8 (fd) 1 & 2: bonding code u : tape & reel pin configuration typical application circuit 3.3v/3a 3.3v/3a en comp fb lx gnd v in 4.75v~20v d1 ss34 10 h r1/62k r2/24k c c2 optional in c c 22 f mlcc v out 10 f r c g5657 on off v out = 0.92v x ( 1+ ) r1 r2 en comp fb lx gnd d1 ss34 10 h r1/62k r2/24k in 0.1 f v out g5657 100 f/220 f electrolytic v in 4.75v~20v c c2 c c 10 f r c on off ss 0.1 f ss 0.1 f note: recommend connecting the thermal pad to the ground for excellent power dissipation. nc g5657f11u in 8 6 5 1 2 3 4 ss lx en comp fb gnd sop-8 (fd) 7 en g5657f12u lx 8 6 5 1 2 3 4 nc in gnd ss comp fb 7 thermal pad thermal pad sop-8 (fd) 3.3v/3a 3.3v/3a en comp fb lx gnd v in 4.75v~20v d1 ss34 10 h r1/62k r2/24k c c2 optional in c c 22 f mlcc v out 10 f r c g5657 on off on off v out = 0.92v x ( 1+ ) r1 r2 en comp fb lx gnd d1 ss34 10 h r1/62k r2/24k in 0.1 f v out g5657 100 f/220 f electrolytic v in 4.75v~20v c c2 c c 10 f r c on off on off ss 0.1 f ss 0.1 f ss 0.1 f ss 0.1 f note: recommend connecting the thermal pad to the ground for excellent power dissipation. nc g5657f11u in 8 6 5 1 2 3 4 ss lx en comp fb gnd sop-8 (fd) 7 en g5657f12u lx 8 6 5 1 2 3 4 nc in gnd ss comp fb 7 thermal pad thermal pad thermal pad thermal pad sop-8 (fd)
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