Microchip Technology ADM00345 Data Sheet
2011-2013 Microchip Technology Inc.
DS20002281B-page 1
MTD6505
Features
• 180° Sinusoidal Drive for high efficiency and low
acoustic noise
• Position Sensorless BLDC Drivers
(No Hall effect sensor required)
• Integrated Power Transistors
• Supports 2V to 5.5V Power Supplies
• Programming Resistor (R
• Supports 2V to 5.5V Power Supplies
• Programming Resistor (R
PROG
) settings to fit
motor constant (K
M
) range from 3.25 mV/Hz to
52 mV/Hz
• Direction Control:
- Forward direction: connect DIR pin to GND or
leave floating
- Reverse direction: connect DIR pin to V
BIAS
or 3V
• Speed Control through Power Supply Modulation
(PSM) and/or Pulse-Width Modulation (PWM)
• Built-in Frequency Generator (FG Output Signal)
• Built-in Lockup Protection and Automatic
• Built-in Lockup Protection and Automatic
Recovery Circuit
• Built-in Overcurrent Limitation
• Built-in Thermal Shutdown Protection
• Built-in Over Voltage Protection
• No External Tuning Required
• Available Package:
• Built-in Thermal Shutdown Protection
• Built-in Over Voltage Protection
• No External Tuning Required
• Available Package:
10-Lead 3mm x 3mm UDFN
Applications
• Notebook CPU Cooling Fans
• 5V 3-Phase BLDC
• 5V 3-Phase BLDC
Description
The MTD6505 device 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 (2V to 5.5V), the
MTD6505 is intended to cover a broad range of motor
characteristics, while requiring minimum external
components. Speed control can be achieved through
either PSM or PWM.
The compact packaging and the minimal bill-of-
material make the MTD6505 device 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 MTD6505 device 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.
The MTD6505 is available in a compact, thermally
enhanced, 3mm x 3mm 10-lead UDFN package.
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 (2V to 5.5V), the
MTD6505 is intended to cover a broad range of motor
characteristics, while requiring minimum external
components. Speed control can be achieved through
either PSM or PWM.
The compact packaging and the minimal bill-of-
material make the MTD6505 device 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 MTD6505 device 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.
The MTD6505 is available in a compact, thermally
enhanced, 3mm x 3mm 10-lead UDFN package.
Package Types
MTD6505
3x3 UDFN*
V
BIAS
R
PROG
OUT2
FG
PWM
DIR
V
DIR
V
DD
GND
1
2
3
2
3
5
10
9
8
8
6
OUT1
OUT3
4
7
EP
11
*Includes Exposed Thermal Pad (EP); see
Sinusoidal Sensorless 3-Phase Brushless DC (BLDC)
Fan Motor Driver