Diodes Incorporated — Analog and discrete power solutions
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AH9281 (Obsolete)

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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.

Feature(s)

  • 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)

Application(s)

  • 5V/12V DC Brushless Motor/Fan
  • PC, Server, Laptop Cooling Fan
  • Power Supply Cooling Fan
  • Large or Small Fans

Product Specifications

Product Parameters

Average OutputDrive Current (mA) 600
Frequency Generator (FG) and Rotation Detect FG
Lock Detect, Shut-Down and Auto Start Yes
Operating Ambient Temperature (°C) -40 to 15
Operating Point Bop Gauss (Max) 50
Operating Point Bop Gauss (Min) -
Operating Point Bop Gauss (Typ) 25
Operating Voltage (V) 2.5 to 16
Peak Output Current (mA) 1200
Release Point Brp Gauss (Max) -
Release Point Brp Gauss (Min) -50
Release Point Brp Gauss (Typ) -25
SupplyCurrent (mA) 4
Typical Total RDS(ON)(NMOS and PMOS Combined) 1.7 @ 12V
Typical Zener Breakdown Voltage (V) 35

Related Content

Quality Documentation

Technical Documents

Recommended Soldering Techniques

TN1.pdf