MP6652A 3-18V Single-Phase BLDC Fan Driver TSOT23

MP6652A 3-18V Single-Phase BLDC Fan Driver TSOT23

The MP6652A 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 Limit
• Integrated Power MOSFETs: Total 850mΩ for High-Side MOSFET (HS-FET) and Low- Side MOSFET (LS-FET)
• Configurable Speed Curve
• 1kHz to 100kHz PWM Input Frequency Range
• Soft-On/Off Phase Commutation
• Configurable Output Indictation on FG/RD: o Rotational Speed Indicator (FG) o Locked Rotor Protection Fault (RD)
• Fixed 27kHz Output Switching Frequency (fSW)
• Configurable Speed Reference Soft-Start Time

Typical Application Circuit

Applications

• Cooling Fans
• GPU Cooling Fans
• 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