Data Sheet
Single Phase Low Noise Smart Motor Driver
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.
AH9479/80/81
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
Low Voltage / Low Power BLDC Motors
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
Mar. 2012
Rev. 1. 1
1
BCD Semiconductor Manufacturing Limited
Data Sheet
Single Phase Low Noise Smart Motor Driver
Absolute Maximum Ratings (Note 1)
Parameter
Supply Voltage
Peak Output Current
Continuous Output Current
FG/RD Pull-up Voltage
FG/RD Output Current
AH9479/80/81
Symbol
V
CC
I
OUT_P
I
OUT_C
V
FG
/V
RD
I
FG
/I
RD
TO-94
Value
18
500
300
18
10
550
600
585
-40 to 85
-55 to 150
TO-94
227
208
214
6000
200
Unit
V
mA
mA
V
mA
Power Dissipation
P
D
TO-95
MSOP-8
mW
Operating Ambient Temperature
Storage Temperature
Thermal Resistance
(Junction to Ambient)
ESD (Human Body Model)
ESD (Machine Model)
T
A
T
STG
ºC
ºC
θ
JA
TO-95
MSOP-8
ºC/W
ESD
ESD
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
Supply Voltage
Operating Ambient Temperature
Symbol
V
CC
T
A
Min
2.5
-40
Max
16
85
Unit
V
ºC
Mar. 2012
Rev. 1. 1
5
BCD Semiconductor Manufacturing Limited
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