MP6655 3.3-18V, 2.5A Single-Phase BLDC Fan Driver TSOT23

MP6655 3.3-18V, 2.5A Single-Phase BLDC Fan Driver TSOT23

The MP6655 is a single-phase brushless DC (BLDC) motor driver with integrated power MOSFETs and a Hall sensor.

Key Specifications

Features

• 3.3V to 18V Operating Input Voltage (VIN) Range
• 2.5A Peak Phase Current
• On-Chip Hall Sensor
• Integrated Power MOSFETs: Total 250mΩ High-Side MOSFETs (HS-FETs) and Low- Side MOSFETs (LS-FETs)
• 60Hz to 100kHz Pulse-Width Modulation (PWM) Input Range
• Curve Configurations
• Configurable Minimum Speed and Starting Duty Cycle
• Closed-Loop or Open-Loop Speed Control
• Configurable Soft-Start Time (tSS)
• Power-Save Mode

Typical Application Circuit

Applications

• Server Fans
• 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