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Single Phase Low Noise Smart Motor Driver AH9479/80/81
Data Sheet
General Description
The AH9479/80/81 is a single chip solution for
driving single coil brushless DC motors. It combines
a motor driver with a high sensitivity Hall sensor,
which simplifies the PCB design and makes the
fabrication of small-size motors possible.
The AH9480 has an open-drain tachometer output FG
that follows the Hall sensor latching output. The
AH9481 has an open-drain rotation detection output
RD that is active low when the motor is spinning and
goes high when blocked.
When there is no motion about 0.4 second, the IC
will automatically detect the locked rotor conditions,
and enter protection mode, shutting off the motor
driver for 4 seconds. Then, the IC will turn on the
motor driver for 0.4 second to detect whether there is
rotation condition, if fails, the IC will shut off motor
driver for four seconds again. This sequence will be
repeated until rotation condition is detected, and the
IC enters normal operation. This feature can
effectively prevent the IC from overheating and
damage due to long-time locked rotor condition.
“Soft-switch” is used to reduce the vibration and
acoustic noise. Thermal-shutdown protection ensures
that the motor driver operates under specified
temperature ranges.
The AH9479 is packaged in TO-94, and the
AH9480/81 is packaged in TO-95 and MSOP-8.
Features
• Full Bridge Driver
• High Sensitivity Integrated Hall Sensor
• Soft-switching for Low Noise
• Low Supply Voltage: 2.5V
• Locked Rotor Protection and Auto-restart
• Thermal Protection
• Output Over-current Protection
• Short Circuit Protection
• Tachometer Output Signal (AH9480)
• Alarm Output Signal (AH9481)
Applications
• 5V/12V Low Noise BLDC Cooling Fans
• L o w Vo l t a g e / L o w P o w e r B L D C M o t o r s
• Notebook DC Fans / Blowers
• Automotive Low Noise Climate Control Fans
• Micro-motors
TO-94 TO-95 MSOP-8
Figure 1. Package Types of AH9479/80/81
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Data Sheet
Single Phase Low Noise Smart Motor Driver AH9479/80/81
Pin Configuration
Z4 Package Z5 Package
(TO-94) (TO-95)
4
3
2
1
(For AH9479) (For AH9480/81)
GND
OUT2
OUT1
VCC
5
4
3
2
1
GND
OUT2
OUT1
VCC
FG/RD
NC
FG/RD
GND
OUT1
M8 Package
(MSOP-8)
1
2
3
4
(For AH9480/81)
8
NC
7
VCC
OUT2
6
5
GND
Figure 2. Pin Configuration of AH9479/80/81
Pin Description
Pin Number
TO-94 TO-95 MSOP-8
1 2
1 2 7
2 3 4
3 4 6
4 5 3, 5
1, 8
Pin
Name
FG/RD
Frequency generator (rotation detection) open drain
output
VCC Power supply pin
OUT1 Output pin 1
OUT2 Output pin 2
GND Ground pin
NC No connection
Function
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Data Sheet
Single Phase Low Noise Smart Motor Driver AH9479/80/81
Functional Block Diagram
A (B) {C}
A for TO-94
B for TO-95
C for MSOP-8
Figure 3. Functional Block Diagram of AH9479/80/81
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Data Sheet
Single Phase Low Noise Smart Motor Driver AH9479/80/81
Ordering Information
AH94 -
Package
Temperature
Circuit Type
79: AH9479
80: AH9480
Package
Z4: TO-94
Z5: TO-95
M8 : MSOP-8
Range
Output
Signal
Part Number Marking ID Packing Type
G1: Green
TR: Tape & Reel
Blank: Bulk
TO-94 AH9479Z4-G1 9479Z4-G1 Bulk
TO-95
-40 to 85°C
MSOP-8
FG AH9480Z5-G1 9480Z5-G1 Bulk
RD AH9481Z5-G1 9481Z5-G1 Bulk
FG AH9480M8TR-G1 9480M8-G1 Tape & Reel
RD AH9481M8TR-G1 9481M8-G1 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
Single Phase Low Noise Smart Motor Driver AH9479/80/81
Absolute Maximum Ratings (Note 1)
Parameter Symbol Value Unit
Supply Voltage VCC 18 V
Peak Output Current I
Continuous Output Current I
FG/RD Pull-up Voltage VFG/VRD 18 V
FG/RD Output Current IFG/IRD 10 mA
Power Dissipation PD
Operating Ambient Temperature TA -40 to 85 ºC
Storage Temperature T
Thermal Resistance
(Junction to Ambient)
ESD (Human Body Model) ESD 6000 V
ESD (Machine Model) ESD 200 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.
500 mA
OUT_P
300 mA
OUT_C
TO-94 550
TO-95 600
MSOP-8 585
-55 to 150 ºC
STG
TO-94 227
θ
JA
TO-95 208
MSOP-8 214
mW
ºC/W
Recommended Operating Conditions
Parameter Symbol Min Max Unit
Supply Voltage VCC 2.5 16 V
Operating Ambient Temperature TA -40 85 ºC
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Data Sheet
Single Phase Low Noise Smart Motor Driver AH9479/80/81
Electrical Characteristics
VCC=12V, TA=25oC, unless otherwise specified.
Parameter Symbol Conditions Min Typ Max Unit
Supply Voltage VCC
Operating, R
=100Ω
COIL
Supply Current ICC 4.3 12 mA
ON Resistance
(R
PMOS+RNMOS=RS
)
R
DSON1_2
FG/RD Output Low
Voltage
FG/RD Output Leakage
Current
I
LEAKAGE
Locked Rotor Period
(ON)
Locked Rotor Period
(OFF)
Protection Temperature T
VCC=12V,TA=25ºC, I
IOL=5mA 0.18 0.5 V
V
OL
VCC>7V 0.4 s
t
ON
VCC>7V 4 s
t
OFF
175 ºC
OTP
=12V,TJ=125℃,I
V
CC
V
FG (VRD
)=5V 0.15 10
=300mA 3.3
OUT
=300mA 3.3
OUT
2.5
16 V
Ω
Ω
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
Single Phase Low Noise Smart Motor Driver AH9479/80/81
Test Circuit
S
Marking Side
N
AH9480/81
OUT1
OUT2 GND
4
5
OUT1 (DO)
FG/RD
5V
VCC
FG/RD
1
VCC
23
OUT2 (DOB)
C1
20pF
Figure 4. Basic Test Circuit of AH9479/80/81
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C2
20pF
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Data Sheet
Single Phase Low Noise Smart Motor Driver AH9479/80/81
Hysteresis Characteristics
VDO (OUT1 ) (V)
V
CC
-30 -20 -10 0 10 20 30
Magnetic Flux Density B (Gauss)
16
14
12
10
8
6
4
2
0
V
SAT
V
SAT
-30 -20 -10 0 10 20 30
Figure 5. VDO vs. Magnetic Flux Density Figure 6. V
Typical Performance Characteristics
Magnetic Flux Density B (Gauss)
DOB
V
(OUT2) (V)
DOB
16
14
12
10
8
6
4
2
0
V
CC
vs. Magnetic Flux Density
10
8
6
(mA)
CC
4
I
2
0
0 5 10 15 20
VCC (V)
With Magnet
Without Magnet
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
(mA)
CC
I
2.5
VCC=3V
2.0
VCC=5V
1.5
VCC=12V
1.0
VCC=14V
0.5
VCC=18V
0.0
-25 0 25 50 75 100
TA (OC)
Figure 7. ICC vs. VCC Figure 8. ICC vs. TA
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Data Sheet
Single Phase Low Noise Smart Motor Driver AH9479/80/81
Typical Performance Characteristics (Continued)
50
40
30
20
10
B (Gauss)
0
-10
-20
4 6 8 101214161820
VCC (V)
50
40
30
20
B
OP
B
RP
B
HYS
10
B (Gauss)
0
-10
-20
-25 0 25 50 75 100 125
TA (OC)
VCC=5V
B
OP
B
RP
B
HYS
Figure 9. BOP/BRP/B
vs. VCC Figure 10. BOP/BRP/B
HYS
HYS
vs. TA (V
CC
=5V)
50
40
30
20
10
B (Gauss)
0
-10
-20
-25 0 25 50 75 100 125
TA (OC)
VCC=12V
B
B
B
40
30
20
OP
RP
HYS
10
B (Gauss)
0
-10
-20
-25 0 25 50 75 100 125
TA (OC)
VCC=18V
B
B
B
OP
RP
HYS
Figure 11. BOP/BRP/B
vs. TA (VCC=12V) Figure 12. BOP/BRP/B
HYS
HYS
vs. TA (V
=18V)
CC
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Data Sheet
Single Phase Low Noise Smart Motor Driver AH9479/80/81
Typical Performance Characteristics (Continued)
10
8
6
(Ω)
S
R
4
VCC=3V, I
VCC=5V, I
VCC=12V, I
VCC=14V, I
VCC=16V, I
VCC=18V, I
2
0
-25 0 25 50 75 100 125
Figure 13. R
OUT
OUT
OUT
OUT
OUT
OUT
=100mA
=200mA
=300mA
=300mA
=300mA
=300mA
TA (OC)
vs. TA Figure 14. RS vs. I
S
8
VCC=12V
6
(Ω)
S
4
R
2
150 200 250 300 350 400 450
I
(mA)
OUT
OUT
1100
1000
900
800
700
600
500
(mV)
FG
V
400
300
200
100
VCC=12V, TA=25OC
0
0 5 10 15 20 25
I
(mA)
OUT
300
250
200
(mV)
SAT_FG
V
150
100
VCC=12V, I
-25 0 25 50 75 100 125
OUT
=5mA
TA (OC)
Figure 15. VFG vs. I
Figure 16. V
OUT
SAT_FG
vs. T
A
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Data Sheet
Single Phase Low Noise Smart Motor Driver AH9479/80/81
Typical Performance Characteristics (Continued)
600
500
400
300
200
Power Dissipation (mW)
100
0
-50 -25 0 25 50 75 100 125 150 175
Ambient Temperature (OC)
Packages: TO-94
TO-95
600
500
400
300
200
Power Dissipation (mW)
100
0
-50 -25 0 25 50 75 100 125 150 175
Ambient Temperature (oC)
Package: MSOP-8
Figure 17. Power Dissipation vs. T
A
Figure 18. Power Dissipation vs. T
A
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Data Sheet
Single Phase Low Noise Smart Motor Driver AH9479/80/81
Typical Application
AH9479
GND
VCC
1
D1
OUT2
OUT1
23
4
R1
C1
D2
COIL
Note 2:C1 should be at least larger than 2.2µF, R1=0 to 10Ω.
Figure 19. Typical Application of AH9479/80/81
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Data Sheet
Single Phase Low Noise Smart Motor Driver AH9479/80/81
Mechanical Dimensions
TO-94 Unit: mm(inch)
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Data Sheet
Single Phase Low Noise Smart Motor Driver AH9479/80/81
Mechanical Dimensions (Continued)
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)
2.200(0.087)
2.400(0.094)
1.000(0.039)
1.200(0.047)
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)
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Data Sheet
Single Phase Low Noise Smart Motor Driver AH9479/80/81
Mechanical Dimensions (Continued)
1.350(0.053)
1.550(0.061)
0.870(0.034)
1.070(0.042)
0.300(0.012)TYP
0.650(0.026)TYP
Hall Sensor
Location
2.900(0.114)
3.100(0.122)
`
MSOP-8 Unit: mm(inch)
P
Y
T
)
6
0
0
.
0
(
0
5
1
.
0
)
)
4
2
1
2
1
1
.
4.700(0.185)
5.100(0.201)
)
)
8
0
0
0
0
0
.
.
0
0
(
(
0
0
0
0
0
2
.
.
0
0
0.410(0.016)
0.650(0.026)
.
0
0
(
(
0
0
0
0
9
1
.
.
2
3
0
°
°
6
0
0
0
1
0
.
3
0
(
7
.
6
0
3
0
9
.
.
0
(
7
0
0
.
3
0
(
0
8
.
0
0
.
4
2
.
0
(
0
0
)
0
)
8
)
1
)
7
Note: Eject hole , oriented hole and mold mark is optional.
Mar. 2012 Rev. 1. 1 BCD Semiconductor Manufacturing Limited
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BCD Semiconductor Manufacturing Limited
IMPORTANT NOTICE
IMPORTANT NOTICE
BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifi-
BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifi-
cations herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any
cations herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any
particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use
particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use
of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or
of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or
other rights nor the rights of others.
other rights nor the rights of others.
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