ver: 0.8 mar 25, 2011 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5655 global mixed-mode technology inc. 2a step-down dc/dc features ? 2a output current ? 0.18 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 and msop-10(fd) package applications ? pc monitors ? dsl modems ? distributed power systems ? pre-regulator for linear regulators general description the G5655 is a monolithic step-down switch mode regulator with a built in internal power mosfet. it achieves 2a continuous output current over a wide in- put supply range with excellent load and line regulation. 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 overwrites the internal soft-start for various requirement of output power up ramp and minimizes the inrush supply current at initial startup. the G5655 requires a minimum number of readily available standard external components. it is available in a sop-8 and msop-10 (fd) package. ordering information order number marking temp. range package (green) G5655p11u G5655 -40 c to +85 c sop-8 G5655p12u G5655a -40 c to +85 c sop-8 G5655f61u G5655 -40 c to +85 c msop-10 (fd) note: p1: sop-8 f6: msop-10 (fd) 1 & 2: bonding code u : tape & reel pin configuration typical application circuit 3.3v/2a 3.3v/2a 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 G5655 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 G5655 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 G5655p11u in 8 6 5 1 2 3 4 ss lx en comp fb gnd sop-8 7 en sop-8 G5655p12u lx 8 6 5 1 2 3 4 nc in gnd ss comp fb 7 nc 10 8 7 1 2 3 4 nc nc in ss en comp fb msop-10 (fd) G5655f61u 9 6 5 lx gnd thermal pad 3.3v/2a 3.3v/2a 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 G5655 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 G5655 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 G5655p11u in 8 6 5 1 2 3 4 ss lx en comp fb gnd sop-8 7 en sop-8 G5655p12u lx 8 6 5 1 2 3 4 nc in gnd ss comp fb 7 nc 10 8 7 1 2 3 4 nc nc in ss en comp fb msop-10 (fd) G5655f61u 9 6 5 lx gnd thermal pad
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