MTD6502B 5V 3-Phase BLDC Sinusoidal Sensorless Fan Motor Driver Features: Description: Position Sensorless BLDC Drivers The MTD6502B device is a 3-phase full-wave driver for (No Hall Sensor Required) brushless sensorless DC motors. It features 180 sinusoidal drive, high torque output and silent drive. 180 Sinusoidal Drive, for High Efficiency and Low With adaptive features, parameters and a wide range Acoustic Noise of power-supplies (2V to 5.5V), the MTD6502B device Support 2V to 5.5V Power Supplies is intended to cover a wide range of motor Direction Control: characteristics, while requiring minimum external - Forward direction: connect DIR pin to GND or components. Speed control can be achieved through leave floating either power supply modulation or pulse-width - Reverse direction: connect DIR pin to V modulation (using the PWM digital input pin). DD Speed Control through Power Supply Modulation With the compact packaging and minimum bill-of- (PSM) and/or Pulse-Width Modulation (PWM) material (integrated power transistors, no Hall sensor, Built-in Frequency Generator (FG Output Signal) no external tuning), the MTD6502B is best suited for low-cost fan applications requiring high efficiency and Built-in Lock-up Protection and Automatic Recovery Circuit (External Capacitor not low acoustic noise, such as notebook CPU cooling fans. Frequency generator (FG) output enables the Necessary) precision speed control in closed-loop applications. Built-in Over Current Limitation The MTD6502B driver includes a lock-up protection Built-in Thermal Shutdown Protection mode, which turns off the output current when the No External Tuning Required motor is under lock condition, and an automatic Available Packages: recovery that enables the fan to run when the lock - 3 mm x 3 mm TDFN-10 condition is removed. The motor overcurrent limitation and thermal-shutdown protection are included for safety-enhanced operations. Applications: The MTD6502B is available in a compact thermally- Notebook CPU Cooling Fans enhanced 3 mm x 3 mm TDFN package. 5V 3-Phase Brushless DC Motors Package Types MTD6502B 3x3 TDFN* 10 FG 1 PWM 9 GND 2 DIR EP 8 V 3 V DD CC 11 OUT1 OUT3 4 7 OUT2 5 6 GND * Includes Exposed Thermal Pad (EP) see Table 2-1. 2011 Microchip Technology Inc. DS25003B-page 1MTD6502B Functional Block Diagram V CC V REF Motor Phase Detection Circuit Regulator V DD Over-current protection V CC FG V CC OUT3 PWM Controller OUT2 OUT1 DIR GND Thermal Short-circuit protection protection DS25003B-page 2 2011 Microchip Technology Inc. Soft Switching Drive Output Drive Circuit