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

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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

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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.

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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

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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 Symbol Conditions Min Typ Max Unit

Supply Voltage VCC Operating 2.5 12 16 V

Supply Current ICC Average 4 6 mA

Output Current I

Output Leakage Current I

Saturation Voltage V

Output ON Time tON 0.8 S

Output OFF Time t

FG/RD Output Low Voltage V

FG/RD Output Leakage
Current

FG/RD Output Current Limit I

I

FGLIM

Output Zener Break-down
Voltage

500 mA

OUT

LEAKAGE

FGL/VRDL

FGLK/IRDLK

0.1 10

I

SAT

5 S

OFF

=350mA 600 1000 mV

OUT

IFG=5mA 0.1 0.2 V

V

FG /VRD

/ I

RDLIMVFG/VRD

35 V

V

Z

=12V 0.1 10

=12V 30 mA

µA

µA

Magnetic Characteristics

VCC=12V, TA=25oC, unless otherwise specified.

Parameter Symbol Min Typ Max Unit

Operating Point

Releasing Point

Hysteresis

B

0 20 50 Gauss

OP

B

-50 -20 0 Gauss

RP

B

40 Gauss

HYS

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Data Sheet

Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD AH9281/82

Test Circuit

S

Marking Side

N

VDO(V)

V

CC

-40 -20 0 20 40

Magnetic Flux Density B (GS)

12

10

8

6

4

2

0

Figure 4. Basic Test Circuit of AH9281/82

V

SAT

V

SAT

-40 -20 0 20 40

Magnetic Flux Density B (GS)

V

(V)

DOB

12

10

8

6

4

2

0

V

CC

Figure 5. VDO vs. Magnetic Flux Density Figure 6. V

vs. Magnetic Flux Density

DOB

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Data Sheet

Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD AH9281/82

Typical Performance Characteristics

6.0

5.5

5.0

4.5

4.0

3.5

3.0

Supply Current (mA)

2.5

2.0

1.5

1.0
2 4 6 8 10 12 14 16 18

Supply Voltage (V)

TA=25oC

6.0

5.5

5.0

4.5

4.0

3.5

3.0

2.5

2.0

Supply Current (mA)

1.5

1.0

0.5

0.0

-40-200 20406080100120

Ambient Temperature (oC)

TA=25oC

=12V

V

CC

Figure 7. Supply Current vs. Supply Voltage Figure 8. Supply Current vs. Ambient Temperature

100

75

50

(Gauss)

25

HYS

/B

RP

0

/B

OP

B

-25

-50

-75
4 6 8 10 12 14 16 18

B

OP

B

RP

B

HYS

Supply Voltage (V)

TA=25oC

50

40
30

20
10

(Gauss)

HYS

0

/B

RP

-10

/B

OP

B

-20

-30

VCC=12V

-40

-50

-40-200 20406080100120

Ambient Temperature (oC)

B

OP

B

RP

B

HYS

Figure 9. BOP/BRP/B

vs. Supply Voltage Figure 10. BOP/BRP/B

HYS

vs. Ambient Temperature

HYS

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Data Sheet

Two Phase Dual-coil High Voltage Smart Fan Motor Driver with FG/RD AH9281/82

Typical Performance Characteristics (Continued)

1000

900

Saturation Voltage (mV)

VCC=12V

800

700

600

500

400

300

200

100

-40 -20 0 20 40 60 80 100 120

Ambient Temperature (oC)

I

OUT

I

OUT

=150mA
=350mA

1200

1000

800

600

400

Saturation Voltage (mV)

200

0

0 100 200 300 400 500 600

Output Current (mA)

TA=25oC
V

=12V

CC

Figure 11. Saturation Voltage

vs. Ambient Temperature Figure 12. Saturation Voltage vs. Output Current

600

500

400

300

200

Power Dissipation (mW)

100

0

-25 0 25 50 75 100 125 150

Ambient Temperature (oC)

Package: TO-95

800

600

400

Power Dissipation (mW)

200

0

-25 0 25 50 75 100 125 150

Ambient Temperature (oC)

Package: SOT-89-5

Figure 13. Power Dissipation vs. Ambient Temperature Figure 14. Power Dissipation vs. Ambient Temperature

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

Typical Application

VCC=5V or 12V

D1

AH9281/2

FG/RD

R

PU

4.7K

47

R1

C1

2.2

VCC

F

FG/RD

DOB GND

DO

Coil 1 Coil 2

R2

4.7

C2

F

2.2

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=47Ω typical.

3. C1=C2=C3=2.2µF typical, electrolytic capacitors are better. They should be fine tuned based on system
design.

4. R2=R3=4.7Ω typical. They can be cancelled according to system requirement.

5. R

=4.7kΩ typical.

PU

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

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=47Ω typical.

3. C1 =2.2µF typical, electrolytic capacitors are better. They should be fine tuned based on system design.

4. ZD1 and ZD2 breakdown voltage are 35V.

5. R

=4.7kΩ typical.

PU

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

T ypical 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=47Ω typical.

3. C1=C2=C3=2.2µF typical, electrolytic capacitors are better. They should be fine tuned based on system
design.

4. R2=R3=4.7Ω typical. They can be cancelled according to system requirement.

5. R

=4.7kΩ typical.

PU

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

T ypical Application (Continued)

VCC=5V or 12V

D1

R1

47

Coil 1

Coil 2

5

AH9281/2

VCC

GND

2 31

GND

R

PU

4.7k

C1

2.2

ZD1 35V

ZD2 35V

4

DODOB

FG/RD

FG/RD

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=47Ω typical.

3. C1=2.2µF typical, electrolytic capacitors are better. They should be fine tuned based on system design.

4. ZD1 and ZD2 breakdown voltage are 35V.

5. R

=4.7kΩ typical.

PU

.

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

Mechanical Dimensions

TO-95 Unit: mm(inch)

1.295(0.051)

1.803(0.071)

0.610(0.024)
MIN

3.531(0.139)

3.785(0.149)

14.000(0.551)

16.000(0.630)

2.250(0.089)

2.450(0.096)

1.150(0.045)

1.350(0.053)

Package Sensor Location

(For Hall IC)

1.220(0.048)

1.620(0.064)

0.381(0.015)

0.581(0.023)

0.360(0.014)

0.510(0.020)

0.950(0.037)
REF

5.105(0.201)

5.359(0.211)

0.330(0.013)

0.432(0.017)

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

Mechanical Dimensions (Continued)

SOT-89-5 Unit: mm(inch)

Oct. 2011 Rev. 1. 4 BCD Semiconductor Manufacturing Limited

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