Diodes Incorporated
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AH9479 (Obsolete)

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The AH9479/80/81 is a single chip solution for driving single coil brushless DC motors. It combines a motor driver with a high sensitivity Hall sensor, which simplifies the PCB design and makes the fabrication of small-size motors possible. When there is no motion about 0.4 second, the IC will automatically detect the locked rotor conditions, and enter protection mode, shutting off the motor driver for 4 seconds. Then, the IC will turn on the motor driver for 0.4 second to detect whether there is rotation condition, if fails, the IC will shut off motor driver for four seconds again. This sequence will be repeated until rotation condition is detected, and the IC enters normal operation. This feature can effectively prevent the IC from overheating and damage due to long-time locked rotor condition. “Soft-switch” is used to reduce the vibration and acoustic noise. Thermal-shutdown protection ensures that the motor driver operates under specified temperature ranges.


  • Full Bridge Driver
  • High Sensitivity Integrated Hall Sensor
  • Soft-switching for Low Noise
  • Low Supply Voltage: 2.5V
  • Locked Rotor Protection and Auto-restart
  • Thermal Protection
  • Output Over-current Protection
  • Short Circuit Protection


  • 5V/12V Low Noise BLDC Cooling Fans
  • Low Voltage / Low Power BLDC Motors
  • Notebook DC Fans / Blowers
  • Automotive Low Noise Climate Control Fans
  • Micro-motors

Product Specifications

Product Parameters

Average OutputDrive Current (mA) 300
Frequency Generator (FG) and Rotation Detect -
Lock Detect, Shut-Down and Auto Start Yes
Operating Ambient Temperature (°C) -40 to 85
Operating Point Bop Gauss (Max) 50
Operating Point Bop Gauss (Min) -
Operating Point Bop Gauss (Typ) 20
Operating Voltage (V) 2.5 to 16
Peak Output Current (mA) 500
Release Point Brp Gauss (Max) -
Release Point Brp Gauss (Min) -50
Release Point Brp Gauss (Typ) -20
Soft-Switch Yes
Speed Control VDD
SupplyCurrent (mA) 4.3
Typical Total RDS(ON)(NMOS and PMOS Combined) 3.3 @ 12V

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