ver: 0.8 jan 09, 2012 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5753/G5753a global mixed-mode technology 3a step-down dc/dc features ? 3a output current ? 0.15 internal power mosfet switch ? stable with low esr output ceramic capacitors ? up to 95% efficiency ? 30a shutdown mode ? fixed 380khz frequency ? thermal shutdown ? cycle-by-cycle over current protection ? wide 4.5v to 24v operating input range ? output adjustable from 1.22v to 21.6v(G5753) ? output adjustable from 0.92v to 21.6v(G5753a) ? available in sop-8 (fd), dip-8 & msop-10 (fd) package applications ? pc monitors ? dsl modems ? distributed power systems ? pre-regulator for linear regulators general description the G5753/G5753a 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 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 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 G5753/g 5753a r equires a minimum number of readily available standard external components. it is available in a sop-8 (fd), dip-8 & msop-10 (fd) package. ordering information order number marking temp. range package (green) G5753f11u G5753 -40 c to +85 c sop-8 (fd) G5753af11u G5753a -40 c to +85 c sop-8 (fd) G5753z31u G5753 -40 c to +85 c dip-8 G5753az31u G5753a -40 c to +85 c dip-8 G5753f61u G5753 -40 c to +85 c msop-10 (fd) G5753af61u G5753a -40 c to +85 c msop-10 (fd) note: f1: sop-8 (fd) z3: dip-8 f6: msop-10 (fd) 1: bonding code u : tape & reel pin configuration typical application circuit output 2.5v/3a r1 10.5k 1% l1 15h d1 3/5 5/7 c5 10nf 4/6 6/8 bs in en ss lx fb comp gnd G5753 c1 10f 35v c2 22f/35v ceramic r2 10k 1% on c3 1nf r3 6.2k c6 open input 4.5v to 24v c4 10nf off 1/2 2/4 7/9 8/10 output 1.2v/3a r1 3.3k 1% l1 15h d1 3/5 5/7 c5 10nf 4/6 6/8 bs in en ss lx fb comp gnd G5753a c2 22f/35v ceramic r2 10k 1% on c3 1nf r3 8.2k c6 open c4 10nf off 7/9 8/10 sop-8 (fd)/dip-8 G5753/G5753a 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. note: recommend connecting the thermal pad to the ground for excellent power dissipation. nc 10 8 7 1 2 3 4 nc bs in ss en comp fb msop-10 (fd) 9 6 5 lx gnd thermal pad G5753/G5753a sop-8 / msop-10 (fd) pin no. 2/4 1/2 input 4.5v to 24v c1 10f 35v note: recommend choosing the small vf of diode to avoid lx to gnd smaller then -0.7v. output 2.5v/3a r1 10.5k 1% l1 15h d1 3/5 5/7 c5 10nf 4/6 6/8 bs in en ss lx fb comp gnd G5753 c1 10f 35v c2 22f/35v ceramic r2 10k 1% on c3 1nf r3 6.2k c6 open input 4.5v to 24v c4 10nf off 1/2 2/4 7/9 8/10 output 1.2v/3a r1 3.3k 1% l1 15h d1 3/5 5/7 c5 10nf 4/6 6/8 bs in en ss lx fb comp gnd G5753a c2 22f/35v ceramic r2 10k 1% on c3 1nf r3 8.2k c6 open c4 10nf off 7/9 8/10 sop-8 (fd)/dip-8 G5753/G5753a 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. note: recommend connecting the thermal pad to the ground for excellent power dissipation. nc 10 8 7 1 2 3 4 nc bs in ss en comp fb msop-10 (fd) 9 6 5 lx gnd thermal pad G5753/G5753a sop-8 / msop-10 (fd) pin no. 2/4 1/2 input 4.5v to 24v c1 10f 35v note: recommend choosing the small vf of diode to avoid lx to gnd smaller then -0.7v.
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