MTD6505_14 Datasheet, PDF (1/22 Pages) Microchip Technology – 3-Phase Sinusoidal Sensorless Brushless Motor Driver

MTD6505
3-Phase Sinusoidal Sensorless Brushless Motor Driver
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_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
Recovery Circuit
• Built-in Overcurrent Limitation
• Built-in Thermal Shutdown Protection
• Built-in Overvoltage Protection
• No External Tuning Required
• Available Package:
10-Lead 3mm x 3mm UDFN
Applications
• Notebook CPU Cooling Fans
• 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
materials 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, 10-lead 3 mm x 3 mm UDFN package.
Package Types
MTD6505
3x3 UDFN*
FG 1
R_{PROG 2}
V_BIAS 3
OUT1 4
OUT2 ⁵
10 PWM
EP
9 DIR
11
8 V_DD
7 OUT3
6 _GND
*Includes Exposed Thermal Pad (EP); see Table 3-1.
 2011-2014 Microchip Technology Inc.
DS20002281C-page 1