G760A Global Mixed-mode Technology Inc. Fan Speed PWM Controller Features General Description Constant Fan Speed Control PWM control for stable operation Build-in MOSFET switch SMBus interface Internal short-circuit protection On/Off control provided G760 is a single chip solution for fan speed control, packaged in a space saving SO-8 package. It connects directly to the fan and performs closed-loop control of the fan speed. The only external component required is a 10µF capacitor. It determined the current fan speed based on the fan rotation pulses and an externally supplied clock. It uses pulse width modulation (PWM) method and an on-chip MOSFET to control the fan speed to ±2% of the programmed speed. The desired fan speed is programmed via the SMBus. The actual fan speed and fan status can be read via the SMBus. Short-circuit protection is implemented to prevent damages to the fan and this IC itself. An On/Off control pin is also provided. Applications Notebook PC Industrial PC LAN Switch Servers Telecom equipment Industrial Control Ordering Information ORDER NUMBER TEMP. RANGE G760A -55°C to +125°C G760Af TRANSPORT PACKAGE MEDIA 2500 Units on Tape and Reel 2500 Units on -55°C to +125°C Tape and Reel SOP-8L SOP-8L (Pb Free) Pin Configuration G760A OUT 1 8 VCC F.G. 2 7 SMBDATA ON/OFF 3 6 SMBCLKLK GND 4 5 CLK SOP-8L TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 4.5 May 19, 2003 1