MP6631B 3.6-35V, 3A Three-Phase BLDC Motor Driver QFN-26

MP6631B 3.6-35V, 3A Three-Phase BLDC Motor Driver QFN-26

The MP6631B is a three-phase, brushless DC (BLDC) motor driver with integrated power MOSFETs.

Key Specifications

Features

• 3.6V to 35V Operating Input Voltage (VIN) Range
• Up to 3A of Peak Phase Current
• Integrated 160mΩ High-Side MOSFETs (HS-FETs) and Low-Side MOSFETs (LS- FETs)
• Sinusoidal Drive
• Supports 0V to 1.2V DC Input or 1kHz to 100kHz Pulse-Width Modulation (PWM) Input
• Supports Triple-Hall or Single-Hall Element Differential Input
• Closed-/Open-Loop Speed Control
• Direction/Brake Input
• Power-Save Mode (PSM)
• 0.5s/4.5s Lock Protection

Typical Application Circuit

Applications

• General Three-Phase Brushless DC (BLDC) Motors

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