Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD
AH9281/82
General Description
The AH9281/82 is a one-chip solution for driving
two-coil brushless DC motors and fans.
Based on the advanced CDMOS process, the IC
contains a Hall-effect sensor, dynamic offset
correction and powerful output drivers with 1200mA
peak output current capability.
Specially designed for driving large fans, the device
is optimized for low start-up voltage. Frequency
Generator or Rotation Detection is available. The
open drain output makes easier the connectivity with
any external interface such as hardware monitoring or
Super I/O IC.
The AH9281/82 is available in TO-95 and SOT-89-5
packages.
Features
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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
Integrated Tachometer (AH9281) or Alarm
(AH9282) Signal Output
ESD Rating: 6000V (Human Body Model)
400V (Machine Model)
Applications
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5V/12V DC Brushless Motor/Fan
PC, Server, Laptop Cooling Fan
Power Supply Cooling Fan
Large or Small Fans
TO-95
SOT-89-5
Figure 1. Package Types of AH9281/82
Oct. 2011
Rev. 1. 4
1
BCD Semiconductor Manufacturing Limited
BCDSEMI [ BCD SEMICONDUCTOR MANUFACTURING LIMITED ]
