ver: 0.5 mar 28, 2012 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5756 global mixed-mode technology 1.5a, 1.4mhz step-down dc/dc features ? 1.5a output current ? 0.15 internal power mosfet switch ? stable with low esr output ceramic capaci- tors ? 30a shutdown mode ? fixed 1.4mhz frequency ? thermal shutdown ? cycle-by-cycle over current protection ? wide 4.5v to 24v operating input range ? output adjustable from 0.92v to 16v ? available in sop-8 (fd) package applications ? pc monitors ? dsl modems ? distributed power systems ? pre-regulator for linear regulators general description the G5756 is a monolithic step-down switch mode regulator with a built in internal power mosfet. it achieves 1.5a 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 30a 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 G5756 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) G5756f11u G5756 -40c to +85c sop-8 (fd) note: f1: sop-8 (fd) 1: bonding code u : tape & reel pin configuration typical application circuit note: recommend connecting the thermal pad to the ground for excellent power dissipation. output 3.3v/1.5a r1 25.5k l1 4.7h d1 3 5 c5 10nf 46 bs in en ss lx fb comp gnd G5756 c1 10f/35v ceramic c2 22f/6.3v ceramic r2 10k c3 1nf r3 20k c6 open input 4.5v to 24v c4 0.1f 1 2 7 8 open = automatic startup sop-8 (fd) G5756 lx 8 6 5 1 2 3 4 bs in gnd ss en comp fb 7 thermal pad note: recommend connecting the thermal pad to the ground for excellent power dissipation. output 3.3v/1.5a r1 25.5k l1 4.7h d1 3 5 c5 10nf 46 bs in en ss lx fb comp gnd G5756 c1 10f/35v ceramic c2 22f/6.3v ceramic r2 10k c3 1nf r3 20k c6 open input 4.5v to 24v c4 0.1f 1 2 7 8 open = automatic startup sop-8 (fd) G5756 lx 8 6 5 1 2 3 4 bs in gnd ss en comp fb 7 thermal pad
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