3-Phase brushless DC fan motor driver

The MTD6501D is a three-phase brushless DC sinusoidal sensorless fan motor driver in an MSOP package. This devices features 180º sinusiodal drive, high torque output, and silent drive. It is intended to cover a wide range of motor characteristics, while requiring no external tuning from the user since it has adaptive features and wide power-supply range capabilities. Speed control can be achieved through either power supply modulation or pulse-width-modulation (using the PWM digital input pin). Due to the compact packaging and minimum bill-of-material (power transistors incorporated, no Hall sensor, no external tuning), it is best suited for low-cost fan applications requiring high efficiency and low acoustic noise, such as CPU cooling fans. Frequency generator output is also included, enabling for precision speed control in closed-loop applications. The MTD6501D drivers include a lockup protection mode, which turns-off the output current when the motor is under lock condition, and an automatic recovery that enables the fan to run when the lock condition is removed. Motor over-current limitation, short-circuit protection, and thermal-shutdown protection are also included.