MTD6508 Data Sheet – Three-Phase Sensorless BLDC Motor Driver
IntroductionThe MTD6508 device is a three-phase full-wave sensorless driver for Brushless DC (BLDC) motors. It features 180° sinusoidal drive, high torque output, and can achieve silent operation. With its adaptive characteristics, parameters, and wide supply voltage range (2V to 5.5V), the MTD6508 is suitable for various motor characteristic applications, requiring very few external components. Speed control can be achieved through Power Supply Modulation (PSM) or Pulse Width Modulation (PWM).The compact package and minimal components make the MTD6508 device very cost-effective in fan applications. For example, the CPU cooling fan in laptops requires a low-noise, low mechanical vibration, and efficient design. The Frequency Generator (FG) output allows for precise speed control in closed-loop applications.The MTD6508 device includes a self-locking protection mode that cuts off output current when the motor is locked, and it also has an automatic recovery function to restart the fan after unlocking. The device also includes motor overcurrent limit and thermal shutdown protection functions to enhance operational safety.The MTD6508 is available in a compact enhanced thermal dissipation 3 mm x 3 mm x 0.5 mm 10-pin UDFN package and a 4 mm x 4 mm x 0.5 mm 16-pin UQFN package.Features
Efficient low-noise 180° sinusoidal drive
Sensorless BLDC driver (no Hall sensors required)
Integrated power transistors
Supports 2V to 5.5V power supply
Variable programming resistance (RPROG) settings suitable for motor constants (KM) in the range of 3.25 mV/Hz to 52 mV/Hz
Speed control via Power Supply Modulation (PSM) and/or Pulse Width Modulation (PWM)
Built-in frequency generator: FG and FG/3 output signals (FG/2 and FG/6 options available upon request)
Output PWM slew rate control, programmable at startup via external resistors (configurable)
Phase target selection for different stability (configurable)
Startup strength selection (configurable)
Startup output current controlled by PWM
Soft-start for output current
Built-in self-lock protection and automatic recovery circuit
Built-in overcurrent limit
Built-in thermal shutdown protection
Built-in overvoltage protection
Minimum startup speed suitable for low-speed operation
Packages:
10-pin 3 mm x 3 mm x 0.5 mm UDFN
16-pin 4 mm x 4 mm x 0.5 mm UQFN (configurable)
Applications
Laptop CPU cooling fans
5V three-phase BLDC motors
Functional Block Diagram
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