ver: 0.8 dec 02, 2010 tel: 886-3-5788833 http://www.gmt.com.tw 1 G5255 global mixed-mode technology inc. current limited load switch features ? input voltage range: 2.7v to 5.5v ? programmable over-current threshold ? 90m typical r ds(on) at v in =5v ? only 2.5v needed for on/off control ? under-voltage lockout ? thermal shutdown ? no reverse leakage current ? open-drain fault flag pin ? tdfn2x2-6, msop-8 and sop-8 package applications ? hot swap supplies ? notebook computers ? peripheral ports ? personal communication devices general description the G5255 is a current limited n-channel mosfet power switch designed for highside load switching applications. the low r ds(on) n-channel power mosfet is driven by a built-in charge pump which generates a voltage higher than the supply voltage to fully enhance the switch. this switch operates with inputs ranging from 2.7v to 5.5v, making it ideal for both 3.3v and 5v sys- tems. an integrated current- limiting circuit protects the input supply against large current which may cause the supply to fall out of regulation. the G5255 is also protected from thermal overload which limits power dissipation and junction tem- peratures. current limit threshold is programmed with a resistor from set to ground. an open-drain flag output is also available to indicate fault condi- tion, including overcurrent, and thermal shutdown. in shutdown mode, the supply current decreases to less than 1 a. the reverse leakage current is also less than 1 a. the G5255 is available in tdfn2x2-6, msop-8 and sop-8 packages. ordering information order number marking enable temp. range package (green) G5255lrb1u e55a active low -40 c to +85 c tdfn2x2-6 G5255hrb1u e55b active high -40 c to +85 c tdfn2x2-6 G5255lp12u G5255la active low -40 c to +85 c sop-8 G5255hp12u G5255ha active high -40 c to +85 c sop-8 G5255lp81u G5255l active high -40 c to +85 c msop-8 G5255hp81u G5255h active high -40 c to +85 c msop-8 note: rb: tdfn2x2-6 p1: sop-8 p8: msop-8 1 & 2: bonding code u : tape & reel pin configuration typical application circuit input 0.47 f 1 f in on(on) gnd out on (on) r set set gnd gnd on(on) 8 6 5 1 2 3 4 in in gnd out out set flg sop-8 G5255 7 flg G5255 flg signal 10k tdfn2x2-6 G5255 in set gnd on(on) 1 2 3 6 5 4 thermal pad out flg note: recommend connecting the thermal pad to the gnd for excellent power dissipation. on(on) 8 6 5 1 2 3 4 in in gnd out out flg set msop-8 G5255 7 input 0.47 f 1 f in on(on) gnd out on (on) r set set gnd gnd on(on) 8 6 5 1 2 3 4 in in gnd out out set flg sop-8 G5255 7 flg G5255 flg signal 10k tdfn2x2-6 G5255 in set gnd on(on) 1 2 3 6 5 4 thermal pad out flg note: recommend connecting the thermal pad to the gnd for excellent power dissipation. on(on) 8 6 5 1 2 3 4 in in gnd out out flg set msop-8 G5255 7
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