MP6634 4.5-35V, 2A Sensorless BLDC Motor Driver QFN-12

MP6634 4.5-35V, 2A Sensorless BLDC Motor Driver QFN-12

The MP6634 is a 3-phase, sensorless brushless DC (BLDC) motor driver with integrated power MOSFETs.

Key Specifications

Features

• 4.5V to 35V Operating Input Voltage (VIN) Range
• Up to Maximum 2A of Peak Current
• Sensorless Field-Oriented Control (FOC)
• Integrated MOSFETs: High-Side MOSFET (HS-FET) + Low-Side MOSFET (LS-FET) = 450mΩ
• Supports 0V to 3.3V DC Input or 50Hz to 20kHz Pulse-Width Modulation (PWM) Input
• Starting Duty Cycle Set with Hysteresis
• Curve Configurations
• Configurable Speed for Open-Loop and Closed-Loop Control
• Configurable Soft-Start Time (tSS)
• Configurable Alignment Time

Typical Application Circuit

Applications

• Automotive Fans
• Air Purifiers
• General Fans

Design Notes

• Set dead time to match the external FET turn-off, not the datasheet typical. Too little risks shoot-through, too much distorts the current waveform at low duty cycle.
• Use a Kelvin connection for the current-sense resistor; shared copper injects switching noise straight into the sense amplifier.
• The thermal pad is the only heat path for most packages — via-stitch it to a ground plane with at least 9 vias.
• PWM frequency trades switching loss against current ripple in the motor inductance; 20 kHz keeps the drive out of the audible band.
• Add a brake or coast path so regeneration during a fast stop does not pump the supply rail.

Common Questions