MP6631B Brushless DC (BLDC) Motor Driver

The Monolithic Power Systems Inc. MP6631B is a 3-phase, brushless DC (BLDC) motor driver with integrated power MOSFETs. The device supports either a single external Hall effect sensor or triple external Hall effect sensors and provides up to 3 A of peak phase current and a 3.6 V to 35 V input voltage (V_IN) range. The device features a short soft-start (SS) configuration for small-sized motors. Rich protection features include input overvoltage protection (OVP), undervoltage lockout (UVLO), locked-rotor protection, overcurrent protection (OCP), and thermal shutdown. The MP6631B is available in a QFN-26 (3 mm x 4 mm) package.

The MP6631B controls the motor speed through the pulse-width modulation (PWM) signal or the DC signal on the PWM/DC pin. It provides closed-loop speed control, open-loop speed control, and built-in configurable speed curve functionality. It also features a sinusoidal drive for maximum torque, as well as low-speed ripple and noise across the full speed range. The MP6631B features rotational speed detection. The rotational speed detector is an open-drain output via the FG/RD pin. It outputs a high- or low-voltage relative to the Hall comparator’s output. The motor direction is controlled via the DIR pin.