ver: 0.2 dec 09, 2009 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5684 global mixed-mode technology inc. step-down dc/dc features ? 4a output current ? 75m internal power mosfet switch ? stable with low esr output ceramic capaci- tors ? up to 95% efficiency ? less than 1 a shutdown current ? wide switching frequency range from 300khz~1.4mhz ? thermal shutdown ? cycle-by-cycle over current protection ? output adjustable from 0.8v to v in ? available in sop-8 (fd) package applications ? tv ? distributed power systems ? pre-regulator for linear regulators general description the G5684 is a monolithic step-down switch mode regulator with a built in internal power mosfet. it achieves 4a continuous output current over a wide switching frequency range with excellent load and line regulation. current mode operation provides fast transient re- sponse and eases of 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 less than 1 a of supply current. internal soft-start minimizes the inrush supply current at initial startup. the G5684 requires a minimum number of readily available standard external components. it is available in sop-8 (fd) package. ordering information order number marking temp. range package (green) G5684f11u G5684 -40 c to +85 c sop-8 (fd) note: f1: sop-8 (fd) 1 : bonding code u : tape & reel pin configuration typical application circuit en 8 6 5 1 2 3 4 comp gnd in fb freq lx * lx sop-8 (fd) G5684 7 v out = 0.8v x ( 1 + ) r1 r2 en comp fb lx gnd d1 4.7 h r1 r2 in 0.1 f v out 3.3v/4a G5684 470 f electrolytic v in 5v c c 10 f r c on off freq thermal pad note: recommend connecting the thermal pad to the ground for excellent power dissipation. en comp fb lx gnd v in 5v d1 4.7 h r1 r2 c c2 optional in c c 22 f 2 mlcc v out 3.3v/4a 10 f r c G5684 on off freq nc c c2 optional nc * pin#6 should be considered as lx when circuit design and pcb layout, but it is nc pin actually. en 8 6 5 1 2 3 4 comp gnd in fb freq lx * lx sop-8 (fd) G5684 7 v out = 0.8v x ( 1 + ) r1 r2 en comp fb lx gnd d1 4.7 h r1 r2 in 0.1 f v out 3.3v/4a G5684 470 f electrolytic v in 5v c c 10 f r c on off on off freq thermal pad note: recommend connecting the thermal pad to the ground for excellent power dissipation. en comp fb lx gnd v in 5v d1 4.7 h r1 r2 c c2 optional in c c 22 f 2 mlcc v out 3.3v/4a 10 f r c G5684 on off freq nc en comp fb lx gnd v in 5v d1 4.7 h r1 r2 c c2 optional in c c 22 f 2 mlcc v out 3.3v/4a 10 f r c G5684 on off on off freq nc c c2 optional nc * pin#6 should be considered as lx when circuit design and pcb layout, but it is nc pin actually.
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