Diodes Incorporated

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AM9789 (Obsolete)

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The AM9789 is a single-phase, full wave motor driver suited for DC fan motor, and its speed is controlled by PWM input signal. It is suitable for both game machine and CPU cooler which need silent drivers. It features lock protection, thermal shutdown, PWM control, low noise and so on.


  • BTL Output Single-phase Full-wave Linear Driver
  • Silent Driver
  • Low Supply Current (Normal Operation,Less than 4mA)
  • Low Standby Current (PWM=0 Duty) @ Supply Current Less than 200μA
  • Speed Controllable by PWM Input Signal
  • Built-in Quick Start Function
  • Built-in Lock Protection and Auto Restart Function
  • Built-in Hall Bias Circuit
  • Built-in FG Output
  • Built-in Thermal Shutdown Circuit
  • Built-in Over Current Protection Circuit


  • Silent Fan Motors

Product Specifications

Product Parameters

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

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