From Microchip the MTD6508 device is a 3-phase full-wave sensorless driver for brushless DC (BLDC) motors that features a 180° sinusoidal drive, high torque output and silent drive. The MTD6508 is designed to cover a wide range of motor characteristics with the minimum of external components. Speed control can be achieved through Power Supply Modulation (PSM) or Pulse-Width Modulation.

180° Sinusoidal Drive for High Efficiency and Low Acoustic Noise
Position Sensorless BLDC Driver - No Hall Effect Sensor Required
Integrated Power Transistors
Supports 2V to 5.5V Power Supplies
Variable Programming Resistor (RPROG) Setting to fit Motor Constant (KM) Range from 3.25 mV/Hz to 52 mV/Hz
Speed Control through Power Supply Modulation (PSM) and/or Pulse-Width Modulation (PWM)
Built-in Frequency Generator: FG, FG/3 Output Signal
Output PWM Slew Rate Control Programmable with an External Resistor for Start-up (Adjustable MTD6508-ADJ model only)
Phase Target Selection for Regulation (Adjustable MTD6508-ADJ model only)
Start-up Strength Selection (Adjustable MTD6508-ADJ model only)
Start-up Output Current Controlled by PWM
Output Current Soft Start
Built-in Lock-up Protection and Automatic
Recovery Circuit
Built-in Overcurrent Limitation
Built-in Thermal Shutdown Protection
Built-in Overvoltage Protection
Low Minimal Start-up Speed for Low-Speed Operation

Motor Controllers & Drivers, Microchip