G994 Global Mixed-mode Technology Inc. 4X Linear Fan Driver for 12V DC Fan Features General Description The G994 is a high performance positive voltage regulator designed for use in applications requiring very low dropout voltage at up to 0.5 Amps. The G994 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 G994 provides excellent regulation over variations in line, load and temperature. VO Follows 4.0 Times of VSET 0.5V Dropout @ 0.5A Over Current and Over Temperature Protection Enable Pin 100µA Quiescent Current in Shutdown Power TO-252-5, SOP-8, SOP-8 with power pad Package Applications Notebook Computer Fan Driver Projector Cooling Fan Battery Powered Systems Motherboards Peripheral Cards The G994 is available in the power TO-252-5, SOP-8 and SOP-8 with power pad package. Ordering Information ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Pb free) G994TJU G994P1U 994 G994 -40°C ~ +85°C -40°C ~ +85°C TO-252-5 SOP-8 G994 -40°C ~ +85°C SOP-8 (FD) G994F1U Note: TJ: TO-252-5 U: Tape & Reel P1: SOP-8 F1:SOP (FD) Pin Configuration Typical Application Circuit G994 VSET G994 VO GND VIN 2 7 GND VEN 3 6 GND VSET 4 5 GND G994 VEN VEN 8 1 VSET VIN VIN VO VO CIN 2.2µF CO 10µF SOP-8 VO =4 X VSET GND G994 Top View 1 2 3 4 5 * VSET VSET G994 VO GND VIN GND VEN VSET VEN VO 1 8 NC/GND VIN 2 7 NC/GND VEN 3 6 GND TO-252-5 VIN VIN VO VO CO 10µF VSET 4 5 GND CIN 2.2µF NC/GND SOP-8 (FD) VO =4 X VSET * : VSET < 0.3V Disable; VSET >1V Enable TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 1.0 Jan 25, 2006 1