Microchip TC664EUNTR Fan Controller IC 10-Pin, MSOP

The TC664 is a single PWM mode fan speed controller with FanSense™ TM technology for use with brushless DC motors. The device allows temperature proportional speed control and therefore accomplishes lower acoustic fan noise and longer fan life. The TC664 reads the voltage provided by an external thermistor (or voltage output temperature sensor) and adjusts a 30% to 100% PWM duty cycle output to the fan with respect to the input temperature voltage. The PWM duty cycle can also be programmed via SMBus to allow fan speed control without the need of an external thermistor. In normal fan operation, pulse trains are present at the SENSE pin. These pulses are used to calculate the fan RPM.

Emperature Proportional Fan Speed for Acoustic Control and Longer Fan Life
FanSense™ Protects Against Fan Failure
Provides RPM Data
2-wire SMBus Compatible Interface
3.0V to 5.5V Supply Range
Fan Voltage Independent of Supply Voltage
Supports Any Fan Voltage
Supports Low Cost NTC/PTC Thermistors