ver: 0.8 may 27, 2013 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5755 global mixed-mode technology 3a, 1.5mhz, 28v step-down dc/dc features ? 3a output current ? wide 4.5v to 28v operating input range ? programmable switching frequency from 100khz to 1.5mhz ? internal soft-start ? cycle-by-cycle over current protection ? ceramic capacitor stable ? high-efficiency pulse skipping mode for light load ? available in dip-8, sop-8 (fd) and tdfn3x3-8 package applications ? high voltage power conversion ? automotive systems ? industrial power systems ? distributed power systems ? battery powered systems ordering information order number marking temp. range package (green) G5755z31u G5755 -40c to +85c dip-8 G5755f11u G5755 -40c to +85c sop-8 (fd) G5755rd1u 5755 -40c to +85c tdfn3x3-8 note: z3: dip-8 f1: sop-8 (fd) rd: tdfn3x3-8 1: bonding code u : tape & reel general description the G5755 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. the wide 4.5v to 28v input range accommodates a variety of step-down applications, including those in an automotive input environment. a 180a operational quiescent current allows use in battery-powered applica- tions. high power conversion efficiency over a wide load range is achieved by scaling down the switching fre- quency at light load condition to reduce the switching and gate driving losses. the frequency foldback helps prevent inductor current runaway during startup and thermal shutdown provides reliable, fault tolerant operation. by switching at 1.5mhz, the G5755 is able to prevent emi (electromagnetic interference) noise prob- lems, such as those found in am radio and adsl ap- plications. the G5755 requires a minimum number of readily available standard external components. it is available in a dip-8, sop-8 (fd) and tdfn3x3-8 package. pin configuration typical application circuit dip-8 G5755 comp 8 6 5 1 2 3 4 lx en fb bs in freq gnd 7 output 3.3v r1 124k d1 1 4 c4 100nf 53 bs in en freq lx fb comp gnd G5755 r2 40.2 k c6 ns input 8 7 2 6 c2 22f 6.3v l1 10h r4 200k c1 10f 50v r5 100k c3 220pf r3 68.1 k r6 24.9k G5755 comp lx en fb bs in freq gnd note: recommend connecting the thermal pad to the ground for excellent power dissipation. tdfn3x3-8 sop-8 (fd) G5755 comp 8 6 5 1 2 3 4 lx en fb bs in freq gnd 7 thermal pad 1 2 3 4 8 7 6 5 thermal pad dip-8 G5755 comp 8 6 5 1 2 3 4 lx en fb bs in freq gnd 7 output 3.3v r1 124k d1 1 4 c4 100nf 53 bs in en freq lx fb comp gnd G5755 r2 40.2 k c6 ns input 8 7 2 6 c2 22f 6.3v l1 10h r4 200k c1 10f 50v r5 100k c3 220pf r3 68.1 k r6 24.9k G5755 comp lx en fb bs in freq gnd note: recommend connecting the thermal pad to the ground for excellent power dissipation. tdfn3x3-8 sop-8 (fd) G5755 comp 8 6 5 1 2 3 4 lx en fb bs in freq gnd 7 thermal pad 1 2 3 4 8 7 6 5 thermal pad
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