MP6654 3-18V BLDC Fan Driver TSOT23

MP6654 3-18V BLDC Fan Driver TSOT23

The MP6654 is a single-phase brushless DC (BLDC) fan driver with integrated power MOSFETs and a Hall-effect sensor.

Key Specifications

Features

• On-Chip Hall Sensor
• Wide 3V to 18V Operating Input Voltage (VIN) Range
• Up to 1A Peak Current (IPEAK)
• Integrated Power MOSFETs: Total 850mΩ High-Side MOSFET (HS-FET) and Low- Side MOSFET (LS-FET)
• Configurable Speed Curve
• Rotational Speed Indicator FG Signal
• Rotor Lock Protection Fault Indication
• 1kHz to 100kHz Pulse-Width Modulation (PWM) Input Frequency Range
• Configurable Soft On/Off Commutation
• 27kHz Fixed Output Switching Frequency (fSW)

Typical Application Circuit

Applications

• CPU Fans for Personal Computers or Servers

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