MP6636 3.3-18V, 4A Sensorless BLDC Motor Driver SOIC

MP6636 3.3-18V, 4A Sensorless BLDC Motor Driver SOIC

The MP6636 is a three-phase, sensorless, brushless DC (BLDC) motor driver with integrated power MOSFETs.

Key Specifications

Features

• 3.3V to 18V Input Voltage (VCC) Range
• Up to 2A of Continuous Current
• Sensorless Field-Oriented Control (FOC)
• Integrated 190mΩ High-Side MOSFETs (HS-FET) and Low-Side MOSFETS (LS- FET)
• Supports 0.3V to 3.15V DC Input or 50Hz to 50kHz Pulse-Width Modulation (PWM) Input for Speed Control
• Starting Duty Cycle Set with Hysteresis
• Curve Configuration
• Selectable Open-/Closed-Loop Speed
• Configurable Soft Acceleration and Align Time
• Configurable Direction Control

Typical Application Circuit

Applications

• Server Fans
• General Three-Phase BLDC 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