General Description

The TC650/TC651 are integrated temperature sensors and brushless DC fan speed controllers. The TC650/ TC651 measure the junction temperature and control the speed of the fan based on that temperature, making them especially suited for applications in modern electronic equipment.

Features

• Integrated Temperature Sensing and Multi-speed Fan Control

• Built-in Overtemperature Alert (TOVER)

• Temperature-proportional Fan Speed Control for Acoustic Noise Reduction and Longer Fan Life

• Pulse Width Modulation (PWM) Output Drive for Cost and Power Savings

• Solid-state Temperature Sensing

• ±1°C (typ.) Accuracy from 25°C to +70°C

• Operating Range: 2.8V – 5.5V

• TC651 includes Automatic Fan Shutdown

• Low Operating Current: 50 µA (typ.)

Applications

• Thermal Protection For Personal Computers

• Digital Set-Top Boxes

• Notebook Computers

• Data Communications

• Power Supplies

• Projectors