ver: 0.5 aug 03, 2009 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5654 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 1.22v to 12v ? available in sop-8 package applications ? pc monitors ? dsl modems ? distributed power systems ? pre-regulator for linear regulators general description the G5654 is a monolithic step-down switch mode regulator with a built in internal power mosfet. it achieves 2a 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 G5654 requires a minimum number of readily available standard external components. it is available in a sop-8 package. ordering information order number marking temp. range package (green) G5654p11u G5654 -40 c to +85 c sop-8 G5654p12u G5654a -40 c to +85 c sop-8 note: p1: sop-8 1: bonding code u : tape & reel pin configuration typical application circuit lx 8 6 5 1 2 3 4 nc in gnd ss en comp fb sop-8 G5654p11u 7 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/2a 10 f r c G5654 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/2a G5654 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 in 8 6 5 1 2 3 4 ss nc lx en comp fb gnd sop-8 G5654p12u 7 lx 8 6 5 1 2 3 4 nc in gnd ss en comp fb sop-8 G5654p11u 7 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/2a 10 f r c G5654 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/2a G5654 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 in 8 6 5 1 2 3 4 ss nc lx en comp fb gnd sop-8 G5654p12u 7
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