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Data Sheet

Two Phase Dual-coil High Voltage Smart Fan Motor Driver AH9280

Oct. 2011 Rev. 1. 2 BCD Semiconductor Manufacturing Limited

General Description

The AH9280 is a most advanced smart fan controller

and Hall IC driver manufactured by special CMOS

process. It is designed for 5V and 12V cooling fan.

To allow survival in a harsh environment and lower

the total system cost, the AH9280 has been designed

with many powerful functions while almost

eliminating all discrete components, such as,

capacitor, resistor, transistor, diode and PC board.

The AH9280 can operate normally in an ambient

temperature up to 125°C due to its Hall IC circuitry

and power MOSFET output that allow low power

dissipation.

When there is no motion for one second, the IC will

automatically detect the locked rotor conditions, and

enter protection mode, shutting off the motor driver

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.

Features

• High-sensitivity Integrated Hall Sensor

• Low Start-up Voltage

• 5V and 12V Operation

• Peak Output Current up to 1200mA

• Power-efficient CMOS and Power MOSFETs

• Built-in Output Protection Clamping Diode

• Locked Rotor Shutdown and Auto-restart

• ESD Rating: 6000V (Human Body Model)

400V (Machine Model)

Applications

• 5V/12V DC Brushless Motor/Fan

• PC, Server, Laptop Cooling Fan

• Power Supply Cooling Fan

• Large/Small Sized Fan

Figure 1. Package Type of AH9280

TO-94

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