ver: 0.3 aug 24, 2009 tel: 886-3-5788833 http://www.gmt.com.tw 1 G9941 global mixed-mode technology inc. 4x linear fan driver for 12v dc fan features ? vo follows 4.0 times of vset ? 0.5v dropout @ 0.5a ? over current and over temperature protection ? enable pin ? 100 a quiescent current in shutdown ? power to-252-5, sop-8 with power pad package applications ? notebook computer fan driver ? projector cooling fan ? battery powered systems ? motherboards ? peripheral cards general description the G9941 is a high performance positive voltage regulator designed for use in applications requiring very low dropout voltage at up to 0.5 amps. the G9941 vo output voltage follows the 4.0 times of vset voltage until it reaches vin voltage. the vset voltage must be larger than 1v to guarantee vo 4.0 times of vset. an enable pin further reduces power dissipation while shut down. the G9941 provides ex- cellent regulation over variations in line, load and temperature. the G9941 is available in the power to-252-5 and sop-8 with power pad package. ordering information order number marking temp. range package (green) G9941tj1u G9941 -40 c ~ +85 c to-252-5 G9941f11u G9941 -40 c ~ +85 c sop-8 (fd) note:tj: to-252-5 f1:sop (fd) 1: bonding code u: tape & reel pin configuration typical application circuit vin vo vset ven vin vo gnd G9941 vo =4 x vset c in 2.2 f c o 10 f ven vset to-252-5 top view 1 3 2 45 vo vin gnd ven vset G9941 gnd vin vo vset ven vin vo gnd G9941 vo =4 x vset c in 2.2 f c o 10 f vset * : v set < 0.3v disable; v set >1v enable * vo 8 6 5 1 2 3 4 ven vin vset sop-8 (fd) 7 nc/gnd nc/gnd gnd nc/gnd G9941 thermal pad vin vo vset ven vin vo gnd G9941 vo =4 x vset c in 2.2 f c o 10 f ven vset to-252-5 top view 1 3 2 45 vo vin gnd ven vset G9941 gnd vin vo vset ven vin vo gnd G9941 vo =4 x vset c in 2.2 f c o 10 f vset * : v set < 0.3v disable; v set >1v enable * vo 8 6 5 1 2 3 4 ven vin vset sop-8 (fd) 7 nc/gnd nc/gnd gnd nc/gnd G9941 thermal pad
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