Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD
General Description
Features
The AH9281/82 is a one-chip solution for driving
two-coil brushless DC motors and fans.
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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.
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AH9281/82
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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The AH9281/82 is available in TO-95 and SOT-89-5
packages.
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
BCD Semiconductor Manufacturing Limited
1
Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD
AH9281/82
Pin Configuration
Z5 Package
(TO-95)
R Package
(SOT-89-5)
GND
DOB
DO
FG/RD
VCC
5
4
3
2
1
DOB
DO
5
4
1
VCC
(Front View)
2
3
GND FG/RD
(Top View)
Figure 2. Pin Configuration of AH9281/82
Pin Description
Pin Number
Pin Name
Function
TO-95
SOT-89-5
1
1
VCC
2
3
FG/RD
3
4
DO
Output pin 1
4
5
DOB
Output pin 2
5
2
GND
Ground pin
Oct. 2011
Power supply pin
Frequency Generator (Rotation Detection) open drain output
Rev. 1. 4
BCD Semiconductor Manufacturing Limited
2
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
3
Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD
AH9281/82
Ordering Information
AH928
-
Circuit Type
G1: Green
1: AH9281
2: AH9282
TR: Tape & Reel
Blank: Bulk
Package
Z5: TO-95
R: SOT-89-5
Package
Temperature
Range
Output
Signal
Part Number
Marking ID
Packing Type
FG
AH9281Z5-G1
9281Z5-G1
Bulk
RD
AH9282Z5-G1
9282Z5-G1
Bulk
FG
AH9281RTR-G1
G41C
Tape & Reel
RD
AH9282RTR-G1
G41D
Tape & Reel
TO-95
-40 to 125qC
SOT-89-5
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
4
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
Supply Voltage
Supply Current (Fault)
Peak Output Current
Continuous Output Current
FG/RD Pull-up Voltage
Symbol
Value
Unit
VCC
ICC
18
6
1200
600
28
V
mA
mA
mA
V
IOUT_P
IOUT_C
VFG/VRD
Power Dissipation
PD
Thermal Resistance
(Junction to Ambient)
șJA
Storage Temperature
ESD (Human Body Model)
ESD (Machine Model)
TO-95
600
SOT-89-5
800
TO-95
208
SOT-89-5
156
-55 to 150
6000
400
TSTG
ESD
ESD
mV
ºC/W
ºC
V
V
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
5
Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD
AH9281/82
Electrical Characteristics
VCC=12V, TA=25oC, unless otherwise specified.
Parameter
Supply Voltage
Supply Current
Output Current
Output Leakage Current
Saturation Voltage
Output ON Time
Output OFF Time
FG/RD Output Low Voltage
FG/RD Output Leakage
Current
FG/RD Output Current Limit
Output Zener Break-down
Voltage
Symbol
VCC
ICC
IOUT
ILEAKAGE
VSAT
tON
tOFF
Conditions
Min
Typ
Max
Unit
2.5
12
4
V
mA
mA
0.1
600
0.8
5
16
6
500
10
1000
Operating
Average
IOUT=350mA
PA
mV
S
S
VFGL/VRDL
IFG=5mA
0.1
0.2
V
IFGLK/IRDLK
VFG /VRD=12V
0.1
10
PA
IFGLIM/ IRDLIM
VFG/VRD=12V
30
mA
35
V
VZ
Magnetic Characteristics
VCC=12V, TA=25oC, unless otherwise specified.
Parameter
Symbol
Operating Point
BOP
Releasing Point
BRP
Hysteresis
BHYS
Oct. 2011
Min
Typ
Max
Unit
0
20
50
Gauss
-50
-20
0
Gauss
40
Rev. 1. 4
Gauss
BCD Semiconductor Manufacturing Limited
6
Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD
AH9281/82
Test Circuit
S
Marking Side
N
Figure 4. Basic Test Circuit of AH9281/82
VDO( V)
VCC
VDOB(V)
12
12
10
10
8
8
6
6
4
4
2
2
VSAT
VSAT
0
-40
-20
0
20
0
-40
40
-20
0
20
40
Magnetic Flux Density B (GS)
Magnetic Flux Density B (GS)
Figure 5. VDO vs. Magnetic Flux Density
Oct. 2011
VCC
Figure 6. VDOB vs. Magnetic Flux Density
Rev. 1. 4
BCD Semiconductor Manufacturing Limited
7
Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD
AH9281/82
Typical Performance Characteristics
6.0
6.0
5.5
5.5
5.0
Supply Current (mA)
Supply Current (mA)
5.0
4.5
4.0
3.5
3.0
2.5
4.5
4.0
3.5
3.0
2.5
2.0
1.5
2.0
o
TA=25 C
1.5
1.0
o
TA=25 C
1.0
VCC=12V
0.5
2
4
6
8
10
12
14
16
0.0
-40
18
-20
0
20
40
60
80
100
120
o
Ambient Temperature ( C)
Supply Voltage (V)
Figure 7. Supply Current vs. Supply Voltage
Figure 8. Supply Current vs. Ambient Temperature
50
100
40
o
TA=25 C
30
BOP/BRP/BHYS (Gauss)
BOP/BRP/BHYS (Gauss)
75
50
25
0
-25
BOP
8
10
12
14
16
18
BHYS
-20
VCC=12V
-20
0
20
40
60
80
100
120
o
Ambient Temperature ( C)
Supply Voltage (V)
Figure 9. BOP/BRP/BHYS vs. Supply Voltage
Oct. 2011
BRP
-10
-50
-40
-75
6
BOP
0
-40
BHYS
4
10
-30
BRP
-50
20
Figure 10. BOP/BRP/BHYS vs. Ambient Temperature
Rev. 1. 4
BCD Semiconductor Manufacturing Limited
8
Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD
AH9281/82
Typical Performance Characteristics (Continued)
1000
1200
VCC=12V
Saturation Voltage (mV)
Saturation Voltage (mV)
900
800
700
600
IOUT=150mA
500
IOUT=350mA
400
1000
800
600
400
o
TA=25 C
300
200
VCC=12V
200
100
-40
0
-20
0
20
40
60
80
100
0
120
100
200
o
Figure 11. Saturation Voltage vs. Ambient Temperature
400
500
600
Figure 12. Saturation Voltage vs. Output Current
600
800
Power Dissipation (mW)
Package: TO-95
Power Dissipation (mW)
300
Output Current (mA)
Ambient Temperature ( C)
500
400
300
200
Package: SOT-89-5
600
400
200
100
0
0
-25
0
25
50
75
100
125
-25
150
25
50
75
100
125
150
o
Ambient Temperature ( C)
Figure 13. Power Dissipation vs. Ambient Temperature
Oct. 2011
0
Ambient Temperature ( C)
o
Figure 14. Power Dissipation vs. Ambient Temperature
Rev. 1. 4
BCD Semiconductor Manufacturing Limited
9
Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD
AH9281/82
Typical Application
VCC=5V or 12V
D1
AH9281/2
VCC FG/RD DO DOB GND
R1
47
Coil 1 Coil 2
RPU
4.7K
FG/RD
R2
4.7
C1
2.2 F
C2
2.2 F
R3
4.7
C3
2.2 F
Figure 15. Typical Application 1 of AH9281/82 (TO-95, Note 2)
Note 2:
1. D1 is an ordinary diode used to filter the noise from VCC and protect IC if VCC and GND are plugged
reversed.
2. R1=47: typical.
3. C1=C2=C3=2.2PF typical, electrolytic capacitors are better. They should be fine tuned based on system
design.
4. R2=R3=4.7: typical. They can be cancelled according to system requirement.
5. RPU=4.7k: typical.
Oct. 2011
Rev. 1. 4
BCD Semiconductor Manufacturing Limited
10
Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD
AH9281/82
Typical Application (Continued)
Figure 16. Typical Application 2 of AH9281/82 (TO-95, Note 3)
Note 3:
1. D1 is an ordinary diode used to filter the noise from VCC and protect IC if VCC and GND are plugged
reversed.
2. R1=47: typical.
3. C1 =2.2PF typical, electrolytic capacitors are better. They should be fine tuned based on system design.
4. ZD1 and ZD2 breakdown voltage are 35V.
5. RPU=4.7k: typical.
Oct. 2011
Rev. 1. 4
BCD Semiconductor Manufacturing Limited
11
Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD
AH9281/82
Typical Application (Continued)
Figure 17. Typical Application 3 of AH9281/82 (SOT-89-5, Note 4)
Note 4:
1. D1 is an ordinary diode used to filter the noise from VCC and protect IC if VCC and GND are plugged
reversed.
2. R1=47: typical.
3. C1=C2=C3=2.2PF typical, electrolytic capacitors are better. They should be fine tuned based on system
design.
4. R2=R3=4.7: typical. They can be cancelled according to system requirement.
5. RPU=4.7k: typical.
Oct. 2011
Rev. 1. 4
BCD Semiconductor Manufacturing Limited
12
Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD
AH9281/82
Typical Application (Continued)
ZD1 35V
Coil 1
Coil 2
ZD2 35V
5
4
DOB
DO
AH9281/2
VCC GND FG/RD
1
2
3
GND
VCC=5V or 12V
R1
47
RPU
4.7k
FG/RD
D1
C1
2.2 F
Figure 18. Typical Application 4 of AH9281/82 (SOT-89-5, Note 5)
Note 5:
1. D1 is an ordinary diode used to filter the noise from VCC and protect IC if VCC and GND are plugged
reversed.
2. R1=47: typical.
3. C1=2.2PF typical, electrolytic capacitors are better. They should be fine tuned based on system design.
4. ZD1 and ZD2 breakdown voltage are 35V.
5. RPU=4.7k: typical.
.
Oct. 2011
Rev. 1. 4
BCD Semiconductor Manufacturing Limited
13
Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD
AH9281/82
Mechanical Dimensions
TO-95
Unit: mm(inch)
1.295(0.051)
1.803(0.071)
0.610(0.024)
MIN
2.250(0.089)
2.450(0.096)
1.150(0.045)
1.350(0.053)
3.531(0.139)
3.785(0.149)
Package Sensor Location
(For Hall IC)
1.220(0.048)
1.620(0.064)
0.381(0.015)
0.581(0.023)
14.000(0.551)
16.000(0.630)
0.360(0.014)
0.510(0.020)
0.950(0.037)
REF
0.330(0.013)
0.432(0.017)
5.105(0.201)
5.359(0.211)
Oct. 2011
Rev. 1. 4
BCD Semiconductor Manufacturing Limited
14
Data Sheet
Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD
AH9281/82
Mechanical Dimensions (Continued)
SOT-89-5
Oct. 2011
Rev. 1. 4
Unit: mm(inch)
BCD Semiconductor Manufacturing Limited
15
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