Diodes Incorporated

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Single Phase 3V/5V BLDC Smart Fan and Motor Driver

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The AM9799 is a single-phase DC brushless motor driver IC featuring BiCMOS process. It is suitable for fan motor drivers for low voltage equipment such as the note personal computers. The AM9799 includes lock shutdown, automatic restart, frequency generator (FG), have been incorporated into one chip. When the motor is under lock condition, lock shutdown function turns off the output current. When the lock condition is removed, the IC automatically restarts and allows DC fan to run. In addition, the FG function is to output rotation speed signal. It features MOS-FET driver circuit for better saturation characteristics. Slew late of amplifiers and feedback resistors are optimized to achieve low-noise motor operation.


  • Lock Detection and Rotational Speed Sensing Mechanisms are Built-in
  • Rotor-locked Protection and Automatic Restart When the Motor Lock is Undone
  • Hall Bias Built-in and Hall Inputs Have a Hysteresis
  • Built-in Thermal Shutdown Circuit
  • Built-in Over Current Protection
  • Built-in Short Protection
  • Operating Voltage: VCC = 2V to 6V
  • BiCMOS Technology
  • Compact Package: MSOP-8
  • Application(s)

  • CPU Cooler Fan in Notebook Personal Computers
  • Product Specifications

    Product Parameters

    Operating Voltage (V) 2 to 6 V
    SupplyCurrent (mA) 4 mA
    Average OutputDrive Current (mA) - mA
    Peak Output Current (mA) 1000 mA
    Reference Voltage Output (V) -
    Hall Bias Voltage (V) 1.3 V
    Speed Control VDD
    Speed Control Slope Adjust -
    Lock Detect, Shut-Down and Auto Start Yes
    Frequency Generator (FG) and Rotation Detect FG RD
    Other Protection Features Thermal Shutdown
    Operating Ambient Temperature (°C) -40 to 105 °C

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