The TA8473F/FG and TA8473FN/FNG are fan motor driver ICs. The output current is 0.4 A (AVE.) and all functions needed for fan motor driving have been incorporated into 1 chip. These are provided with the function to automatically change the motor speed by detecting ambient temperature through the externally mounted thermistor. Furthermore, the TA8473F/FG and TA8473FN/FNG are provided with the noise reduction terminal, the FG terminal to output pulses proportional to the motor speed and the RD terminal to detect the motor status.