Data Sheet Two Phase Dual-coil High Voltage Smart Fan Motor Driver AH9280 General Description Features The AH9280 is a most advanced smart fan controller High-sensitivity Integrated Hall Sensor and Hall IC driver manufactured by special CMOS Low Start-up Voltage process. It is designed for 5V and 12V cooling fan. 5V and 12V Operation To allow survival in a harsh environment and lower Peak Output Current up to 1200mA the total system cost, the AH9280 has been designed Power-efficient CMOS and Power MOSFETs with many powerful functions while almost Built-in Output Protection Clamping Diode eliminating all discrete components, such as, Locked Rotor Shutdown and Auto-restart capacitor, resistor, transistor, diode and PC board. ESD Rating: 6000V (Human Body Model) 400V (Machine Model) The AH9280 can operate normally in an ambient temperature up to 125C due to its Hall IC circuitry and power MOSFET output that allow low power Applications dissipation. 5V/12V DC Brushless Motor/Fan When there is no motion for one second, the IC will PC, Server, Laptop Cooling Fan automatically detect the locked rotor conditions, and Power Supply Cooling Fan enter protection mode, shutting off the motor driver Large/Small Sized Fan for five seconds. Then, the IC will turn on the motor driver for one second to detect whether there is rotation condition, if fails, the IC will shut off motor driver for five seconds again. This sequence will be repeated until rotation condition is detected, and the IC enters normal operation. This feature can effectively prevent the AH9280 from overheating and damage due to long-time locked rotor condition. Specially designed for driving large fans, the AH9280 is optimized for low start-up voltage. The AH9280 is available in TO-94 package. TO-94 Figure 1. Package Type of AH9280 Oct. 2011 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 1 Data Sheet Two Phase Dual-coil High Voltage Smart Fan Motor Driver AH9280 Pin Configuration Z4 Package (TO-94) 4 3 2 1 Figure 2. Pin Configuration of AH9280 (Front View) Pin Description Pin Number Pin Name Function 1 VCC Power supply pin 2 DO Output pin 1 3 DOB Output pin 2 4 GND Ground pin Oct. 2011 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 2