Highly Integrated 3-Phase BLDC Sinusoidal Sensorless

Motor Fan Drivers and Dual Full-Bridge Drivers

More Cost Effective and Faster Time to Market

3-Phase BLDC Sinusoidal Motor Drivers

The MTD6501C/D/2B/5 product family is a 3-phase full-

wave sensorless driver for brushless DC (BLDC) motors.

It features 180° sinusoidal drive, high torque output and

silent drive. With the adaptive features, parameters and

wide range of power-supplies, the MTD6501C/D/2B/5 are

intended to cover a broad range of motor characteristics,

while requiring minimum external components. Speed

control can be achieved through either power supply

modulation (PSM) or pulse-width modulation (PWM). The

compact packaging and the minimal bill-of-material make

the MTD6501C/D/2B/5 product family extremely cost

efficient in fan applications.

For example, the CPU cooling fans in notebook computers

require designs that provide low acoustic noise, low

mechanical vibration, and are highly efficient. The frequency

generator (FG) output enables precision speed control in

closed-loop applications.

The MTD6501C/D/2B/5 includes Lockup Protection mode

to turn off the output current when the motor is in a lock

condition, with an automatic recovery feature to restart the

fan when the lock condition is removed. Motor overcurrent

limitation and thermal shutdown protection are included for

safety enhanced operations.

MTD6505 Application CIrcuit Diagram

Device

Vmax

Fsw

Package

Features

MTD6501C

15.3V

20 kHz

Thermally enhanced SOIC-8

FG, PWM, Lockup recovery

MTD6501D

15.3V

20 kHz

MSOP-10

FG, PWM, Boost, Lockup recovery

MTD6501G

15.3V

23 kHz

Thermally enhanced SOIC-8

FG, PWM, Lockup recovery

MTD6502B

5.5V

30 kHz

TDFN-10

FG, PWM, DIR, Lockup recovery

MTD6505

5.5V

30 kHz

UDFN-10

FG, PWM, DIR, Lockup recovery, programmable

BEMF coefficient

FG

PROG

OUT1

OUT2

PWM

DIR

OUT3

GND

C1

C2

MTD6505

Features

low acoustic noise

(no hall-effect sensor required)

and/or Pulse-Width Modulation (PWM)

Applications