DESCRIPTION
The MP6631 is a three-phase brushless DC
(BLDC) motor driver with integrated power
MOSFETs. The device supports a single
external Hall-effect sensor or triple external
Hall-effect sensors to drive a three-phase BLDC
motor, with up to 3A of peak phase current and
an input voltage (VIN) range of 3.6V to 24V.
The MP6631 controls the motor speed through
the pulse-width modulation (PWM) signal or the
DC signal on the PWM/DC pin with closed-
/open-loop speed control. The device features a
built-in, configurable speed curve function. It
also features a sinusoidal drive for maximum
torque, as well as low speed ripple and noise
across the full speed range.
The MP6631 provides rotational speed
detection. The rotational speed detector (the
FG/RD pin) is an open-drain output. It outputs a
high or low voltage relative to the Hall
comparator’s output. Direction control is
achieved via the DIR pin’s input.
Rich protection features include under-voltage
lockout (UVLO), locked-rotor protection, overcurrent
protection (OCP), and thermal
shutdown protection.
The MP6631 is available in a QFN-26
(3mmx4mm) package.

FEATURES
• 3.6V to 24V Operating Input Voltage (VIN)
Range
• Up to 3A of Peak Phase Current
• Integrated 160mΩ High-Side MOSFETs
(HS-FETs) and Low-Side MOSFETs (LSFETs)
• 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
• 0.5s/4.5s Lock Protection
• Over-Current Protection (OCP)
• Single-Pulse or Triple-Pulse FG Output per
Electrical Cycle
• FG Signal: Rotational Speed Indication
• Soft Start (SS) for Low Noise and Current
Overshoot
• Available in a QFN-26 (3mmx4mm)
Package

APPLICATIONS
• Fans
• General Three-Phase Brushless DC (BLDC)
Motors
• Pumps