MP9518 3.3-18V Motor Driver TSOT23

MP9518 3.3-18V Motor Driver TSOT23

The MP9518 is a single-phase, brushless, DC motor driver with integrated power MOSFETs and a hall-effect sensor.

Key Specifications

Features

• Embedded Hall Sensor with High Sensitivity
• Wide 3.3V to 18V Operating Input Range
• Up to 1.2A Programmable Current Limit
• Integrated Power MOSFETs: Total 850mΩ (HS + LS)
• Automatic Phase Lock Detection of Winding BEMF and Current Zero-Crossing
• Soft On/Off Phase Transition
• Rotational Speed Indicator FG Signal
• 12kHz to 48kHz PWM Input Frequency Range
• Fixed 26kHz Output Switching Frequency
• Input Line Reverse-Voltage Protection (RVP)

Typical Application Circuit

Applications

• CPU Fan 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