Data Sheet
BTL Drive Single-phase Full-wave Fan Motor Driver
General Description
The AM4951/R/2 series is a single-phase BTL output
fan motor driver designed by bipolar process. This IC
features high efficiency, silent operation and includes
lock shutdown and automatic restart functions. When
the motor is under lock condition, the lock
shutdown function turns off the output current. When
the lock condition is removed, the IC will
restart automatically and allow DC fan to run. It is
applied for high reliability and low noise application,
such as personal computers, notebook, car audio,
CPU cooling systems and power supplies in
consumer electronics systems.
The AM4951/R series is available in MSOP-8 (12V
application only) or PSOP-8 (24V application only)
package. The AM4952 is available in MSOP-10
package.
AM4951/R/2
Features
•
•
•
BTL Output Single-phase Full-wave Linear
Drive (Gain Resistor=1k to 360kΩ, Gain=51dB)
Support Low-voltage Drive and Feature a Wide
Usable Voltage Range (2.2V to 24V)
Low Saturation Output (High Side and Low Side
Saturation Voltage): V
SAT_TOTAL
=1.2V (typical,
I
OUT
=200mA)
Built-in Lock Protection and Automatic Restart
Circuits
Built-in FG/RD Output
Built-in Hall Sensor Bias (AM4952 Only,
V
HB
=1.5V)
Thermal Protection Circuit
Small-sized, High Thermal Capacity Package
FG Output (AM4951), RD Output (AM4951R),
FG and RD Output (AM4952)
•
•
•
•
•
•
Applications
•
•
•
Notebook, Personal Computers
Power Supplies in Consumer Electronics, Car
Audio and Office Peripherals
CPU Cooling Systems
MSOP-8
PSOP-8
MSOP-10
Figure 1. Package Types of AM4951/R/2
Apr. 2012
Rev. 1. 4
1
BCD Semiconductor Manufacturing Limited
Data Sheet
BTL Drive Single-phase Full-wave Fan Motor Driver
Absolute Maximum Ratings (Note 1, T
A
=25ºC)
Parameter
Supply Voltage
Peak Output Current
FG/RD Pull-up Voltage
FG/RD Output Current
Thermal Resistance
(Junction to Ambient)
AM4951/R/2
Symbol
V
CC
I
OUT
V
FG
/V
RD
I
FG
/I
RD
MSOP-8
θ
JA
PSOP-8
MSOP-10
MSOP-8
Value
28
500
28
10
205
110
195
48
36
46
585
960
585
-40 to 125
-55 to 150
Unit
V
mA
V
mA
°C/W
Thermal Resistance
(Junction to Case)
θ
JC
PSOP-8
MSOP-10
MSOP-8
°C/W
mW
mW
mW
ºC
ºC
Power Dissipation
P
D
PSOP-8
MSOP-10
Operating Temperature
Storage Temperature
T
OP
T
STG
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
Hall Input Voltage
Operating Ambient Temperature
Symbol
V
CC
V
ICM
T
A
Min
2.2
0
-40
Max
24
V
CC
-1.5
105
Unit
V
V
ºC
Apr. 2012
Rev. 1. 4
5
BCD Semiconductor Manufacturing Limited
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