Diodes Incorporated

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AM4953 (Obsolete)

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The AM4953 is a single-phase BTL output fan motor driver designed by bipolar process. This IC features high efficiency, silent operation and includes lock shutdown and automatic restart functions. When the motor is under lock condition, the lock shutdown function turns off the output current. When the lock condition is removed, the IC will restart automatically and allow DC fan to run. It is applied for high reliability and low noise application, such as personal computers, notebook, car audio, CPU cooling systems and power supplies in consumer electronics systems.


  • BTL Output Single-phase Full-wave Linear Drive (Gain Resistor=1k to 360kΩ, Gain=51dB)
  • Support Low-voltage Drive and Feature a Wide Usable Voltage Range (2.2V to 16V)
  • Low Saturation Output (High Side and Low Side Saturation Voltage): VSAT_TOTAL=1.2V (typical, IOUT=300mA)
  • Built-in Lock Protection and Automatic Restart Circuits
  • Built-in FG/RD Output
  • Built-in Hall Sensor Bias (VHB=1.45V)
  • Thermal Protection Circuit
  • Small-sized, High Thermal Capacity Package


  • Notebook, Personal Computers
  • Power Supplies in Consumer Electronics, Car Audio
  • CPU Cooling Systems

Product Specifications

Product Parameters

Average OutputDrive Current (mA) -
Frequency Generator (FG) and Rotation Detect FG and RD
Hall Bias Voltage (V) 1.5
Lock Detect, Shut-Down and Auto Start Yes
Operating Ambient Temperature (°C) -
Operating Voltage (V) 2.2 to 24
Other Protection Features Thermal Shutdown
Peak Output Current (mA) -
Reference Voltage Output (V) -
Speed Control VDD
Speed Control Slope Adjust -
SupplyCurrent (mA) 5

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