G9731 Global Mixed-mode Technology Inc. 4A Low Dropout Regulator with Enable Features General Description The G9731 is a high performance positive voltage regulator designed for use in applications requiring very low Input voltage and very low dropout voltage at up to 4 amps. It operates with VPP voltage 5V and output voltage programmable as low as 0.8V. The G9731 features ultra low dropout, ideal for applications where VOUT is very close to VIN. Additionally, the G9731 has an enable pin to further reduce power dissipation while shutdown. The G9731 provides excellent regulation over variations in line, load and temperature. The G9731 provides a power OK signal to indicate if the voltage level of VO reaches 92% of its rating value. Adjustable Output Low to 0.8V 330mV Dropout @ 4A, VO 1.2V Over Current and Over Temperature Protection Enable Pin Low Reverse Leakage (Output to Input ) Power SOP-8 (FD) Packages with Thermal Pad ±2% Output Voltage VO Power OK Signal VO Pull Low Resistance when Disable VO Soft Start when Enable Applications Motherboards Peripheral Cards Network Cards Set Top Boxes Notebook Computers The G9731 is available in the power SOP-8 (FD) package. Ordering Information ORDER NUMBER MARKING G9731F11U G9731 TEMP. RANGE PACKAGE (Green) -40°C~+85°C SOP-8 (FD) Note: F1: SOP-8 (FD) 1: Bonding Code U : Tape & Reel Pin Configuration Typical Application Circuit G9731 6 VPP (5V) 8 G9731 GND 8 1 5 VIN VEN 3,4 VO ADJ 2 7 POK 2 C1 (optional) Thermal Pad VO 3 6 VPP VO 4 5 VIN CPP 1µF CIN 20µF R1 VPP POK 7 10kΩ VIN VEN VIN GND 1 VO ADJ CO 20µF R2 Top View SOP-8 (FD) * Thermal Pad can be connected to VIN ** Connect Thermal Pad to ground plate will have better thermal performance 0.8 (R1+R2) Volts, R2<120kΩ is recommended R2 2. C1 is not necessary. VO is also stable if C1 = 22pF~150pF 1. VO = TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.4 Feb 14, 2011 1