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