ver: 0.4 may 27, 2013 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5671 global mixed-mode technology 3a synchronous step-down dc/dc features ? 3a output current ? 75m internal power mosfet switch ? stable with low esr output ceramic capaci- tors or poscaps ? 85% efficiency at 2.5a output current (5v->1.8v) ? less than 1 a shutdown current ? 1mhz switching frequency ? power good opened drain output ? thermal shutdown ? cycle-by-cycle over current protection ? output adjustable from 0.6v to v in ? available in tdfn3x3-10 package applications ? nb ? distributed power systems ? pre-regulator for linear regulators general description the G5671 is a monolithic step-down switch mode regulator with a built in internal power mosfet. it achieves a continuous output current at 1mhz switch- ing frequency with excellent load and line regulation. current mode operation provides fast transient re- sponse and eases of loop stabilization. power good function delivers power supply ready signal to the load. fault condition protection includes cycle-by-cycle cur- rent limiting, output short circuit protection and thermal shutdown. in shutdown mode the regulator ground current is controlled less than 1 a. an internal soft-start minimizes the inrush supply current at initial startup. the G5671 requires a minimum number of readily available standard external components. it is available in tdfn3x3-10 package. ordering information order number marking temp. range package (green) G5671re1u 5671 -40 c to +85 c tdfn3x3-10 note: re: tdfn3x3-10 1: bonding code u: tape & reel pin configuration typical application circuit tdfn3x3-10 4 G5671 1 2 3 8 7 6 vin vcc 5 9 10 pok tdfn3x3-10 4 1 2 3 8 7 6 sw nc sw vin nc 5 9 10 en fb thermal pad (gnd) note: recommend connecting the thermal pad to the ground for excellent power dissipation. vcc fb sw gnd v in 2.2 h r1 40k vin 22 f v out 1.8v/3a 10 f G5671 on off pok 10 0.1 f pgd en 10k r2 20k v in tdfn3x3-10 4 G5671 1 2 3 8 7 6 vin vcc 5 9 10 pok tdfn3x3-10 4 1 2 3 8 7 6 sw nc sw vin nc 5 9 10 en fb thermal pad (gnd) note: recommend connecting the thermal pad to the ground for excellent power dissipation. vcc fb sw gnd v in 2.2 h r1 40k vin 22 f v out 1.8v/3a 10 f G5671 on off on off pok 10 0.1 f pgd en 10k r2 20k v in
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