Diodes AH9281, AH9282 User Manual
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD AH9281/82
Data Sheet
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
• P C , S e r v e r , L a p t o p C o o l i n g F a n
• 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 BCD Semiconductor Manufacturing Limited
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Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD AH9281/82
Pin Configuration
Z5 Package R Package
(TO-95) (SOT-89-5)
DOB
DO
45
5
4
3
2
1
(Front View) (Top View)
Figure 2. Pin Configuration of AH9281/82
GND
DOB
DO
FG/RD
VCC
123
GND
FG/RDVCC
Pin Description
Pin Number
Pin Name Function
TO-95 SOT-89-5
1 1
2 3
3 4
4 5
5 2
VCC Power supply pin
FG/RD Frequency Generator (Rotation Detection) open drain output
DO Output pin 1
DOB Output pin 2
GND Ground pin
Oct. 2011 Rev. 1. 4 BCD Semiconductor Manufacturing Limited
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Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD AH9281/82
Functional Block Diagram
A (B)
A for TO-95
B for SOT-89-5
Figure 3. Functional Block Diagram of AH9281/82
Oct. 2011 Rev. 1. 4 BCD Semiconductor Manufacturing Limited
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Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD AH9281/82
Ordering Information
AH928 -
Package
Temperature
Circuit Type
1: AH9281
2: AH9282
Package
Z5: TO-95
R: SOT-89-5
Range
Output
Signal
Part Number Marking ID Packing Type
G1: Green
TR: Tape & Reel
Blank: Bulk
TO-95
-40 to 125°C
SOT-89-5
FG AH9281Z5-G1 9281Z5-G1 Bulk
RD AH9282Z5-G1 9282Z5-G1 Bulk
FG AH9281RTR-G1 G41C Tape & Reel
RD AH9282RTR-G1 G41D Tape & Reel
BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant
and green.
Oct. 2011 Rev. 1. 4 BCD Semiconductor Manufacturing Limited
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Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD AH9281/82
Absolute Maximum Ratings (Note 1, TA=25ºC)
Parameter Symbol Value Unit
Supply Voltage VCC 18 V
Supply Current (Fault) ICC 6 mA
Peak Output Current I
Continuous Output Current I
FG/RD Pull-up Voltage VFG/VRD 28 V
Power Dissipation PD
1200 mA
OUT_P
600 mA
OUT_C
TO-95 600
SOT-89-5 800
mV
Thermal Resistance
(Junction to Ambient)
Storage Temperature T
ESD (Human Body Model) ESD 6000 V
ESD (Machine Model) ESD 400 V
θ
JA
-55 to 150 ºC
STG
TO-95 208
SOT-89-5 156
ºC/W
Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute
Maximum Ratings” for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter Symbol Min Max Unit
Supply Voltage VCC 2.5 16 V
Operating Ambient Temperature TA -40 125 ºC
Oct. 2011 Rev. 1. 4 BCD Semiconductor Manufacturing Limited
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