Diodes AH9281_82 - Manual

Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD AH9281/82
Oct. 2011 Rev. 1. 4 BCD Semiconductor Manufacturing Limited
1
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
• 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
• 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