MPQ6541
Highly integrated 60V three-phase BLDC motor driver with 3A continuous current, integrated power MOSFETs, and sensorl...
Product Overview
Description
The MPQ6541 integrates three half-bridge power stages with 60V, 3A MOSFETs and comprehensive control logic. This high integration eliminates the need for external power MOSFETs and gate drivers, significantly reducing PCB area and design complexity.
The device supports both sensorless and sensored operation. Sensorless control uses back-EMF detection for commutation, eliminating Hall sensors. Sensored mode accepts Hall sensor inputs for precise position control. The integrated PWM generator supports various control algorithms including trapezoidal and sinusoidal commutation.
Comprehensive protection features include over-current protection, thermal shutdown, under-voltage lockout, and shoot-through prevention. The AEC-Q100 qualified version is suitable for automotive applications including pumps, fans, and actuators.
Product Series
MPQ
Primary Application
Industrial pumps
Key Features
- 60V operation
- 3A continuous current
- Integrated MOSFETs
- Sensorless control
- AEC-Q100 qualified
Specifications
| Supply Voltage | 6V to 60V |
|---|---|
| Output Current | 3A continuous, 5A peak |
| MOSFET Rdson | 150mΩ (high-side + low-side) |
| PWM Frequency | Up to 100kHz |
| Control Interface | PWM / Hall / Sensorless |
| Operating Temperature | -40°C to +125°C (AEC-Q100) |
| Package | QFN-32 (5mm x 5mm) |
Applications
Industrial pumps
Industrial automation and control
Cooling fans
Electronic system design
Robotics
Electronic system design
Automotive actuators
Automotive and EV electronics
Drones
Electronic system design
FAE Expert Insights
"The MPQ6541 is an excellent integrated solution for BLDC motor control up to 3A. The integration level is impressive - everything you need in a 5x5mm package. I've used this in several industrial pump and automotive fan applications with great success. The sensorless control works well for most applications, though I recommend Hall sensors for very low-speed operation (<100 RPM). The protection features are comprehensive and have saved designs from various fault conditions. Thermal management is important - provide adequate copper area under the thermal pad. Overall, this is my go-to recommendation for 3-phase BLDC applications under 3A."
High integration with 60V/3A capability and sensorless control
— Robert Chen, BeiLuo
Frequently Asked Questions
How do I configure the MPQ6541 for sensorless operation?
For sensorless BLDC control: 1) Connect motor phases to U, V, W outputs. 2) Apply PWM signals to PWM_U, PWM_V, PWM_W inputs with proper 60-degree commutation sequence. 3) The device detects zero-crossing of back-EMF on the undriven phase for commutation timing. 4) Start-up requires open-loop acceleration until sufficient back-EMF is generated. 5) Configure BEMF threshold and filter settings via external resistors. The datasheet provides detailed timing diagrams and recommended start-up sequences.
Download the MPQ6541 sensorless control application note for detailed configuration guidance.
What is the recommended PWM frequency?
The MPQ6541 supports PWM frequencies from 10kHz to 100kHz. Lower frequencies (10-20kHz) reduce switching losses but may cause audible noise. Higher frequencies (40-100kHz) reduce current ripple and audible noise but increase switching losses. For most applications, 20-40kHz provides good balance. The dead time between high-side and low-side switching is internally fixed at 1µs to prevent shoot-through. Ensure PWM signals from your controller have adequate dead time.
Start with 20kHz and adjust based on audible noise and thermal performance in your application.
How do I implement current sensing for torque control?
The MPQ6541 provides low-side current sense outputs for each phase. Connect sense resistors between low-side MOSFET sources and ground. The ISEN_U, ISEN_V, ISEN_W pins provide amplified current signals. For torque control: 1) Sample phase currents during low-side conduction. 2) Reconstruct three-phase currents. 3) Apply Clarke and Park transforms for FOC (if implemented externally). 4) Use current feedback for torque control loops. Typical sense resistor values are 10-50mΩ depending on current range and ADC resolution.
Contact our FAE team for current sensing reference designs and FOC implementation guidance.
What thermal management is required for the MPQ6541?
At 3A continuous with 150mΩ total Rdson, the MPQ6541 dissipates approximately 1.35W (3A² × 0.15Ω). With Theta-JA of 35°C/W, this results in 47°C temperature rise above ambient. To keep junction temperature below 125°C at 60°C ambient: 1) Use 4-layer PCB with solid ground plane. 2) Provide 25mm x 25mm copper area under the thermal pad. 3) Use multiple thermal vias (9-16) to inner ground planes. 4) Consider airflow for continuous 3A operation. The device has thermal shutdown at 160°C for protection.
Use MPS thermal simulation tools or contact us for thermal design review.
Can the MPQ6541 drive stepper motors?
The MPQ6541 is optimized for 3-phase BLDC motors and is not recommended for stepper motor control. For stepper motors, use dedicated stepper drivers like the MPQ6600 or MPQ6610 which provide microstepping and current decay control. If you must use MPQ6541 for stepper control, it would require external control logic to sequence the phases appropriately, but this is not the intended application and performance will be suboptimal.
Use MPQ6600 or MPQ6610 for stepper motor applications. Contact us for stepper driver recommendations.