NJU7332
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Ver.2003-03-19
Single-phase DC Brushless Motor Driver IC
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GENERAL DESCRIPTION
The NJU7332 is a single-phase DC brushless motor driver IC
for very small fan-motor application. It features MOS-FET driver
circuit for better saturation characteristics. Slew late of amplifiers
and feedback resistors are optimized to achieve low-noise motor
operation.
NJU7332 adopt a very small FFP package, therefore it is
suitable for micro motor applications.
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PACKAGE OUTLINE
NJU7332PB1
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FEATURES
Single Supply
Operating Voltage V
DD
=2.4
5.5V
Low Operating Current
Low Saturation Output Voltage
Vsat=
0.2V @Io=
100mA
C-MOS Technology
Package Outline FFP12 (2
2
0.85mm)
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PIN CONFIGURATIONS
Preliminary
VDD
IN-
OUT A
VSS
IN+
OUT B
Top view
OUT A
VDD
VDD
OUT B
IN-
VSS
1pin
12pin
NJU7332
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Ver.2003-03-19
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ABUSOLUTE MAXIMUM RATINGS (Ta=25
C)
PARAMETER RATINGS
SYNBOL(unit) NOTE
Supply Voltage
+7.0
V
DD
(V)
Input Voltage
-0.3
V
DD
+0.3
V
ID
(V)
Operating Temperature Range
-40
+85
Topr (
C
)
Storage Temperature Range
-50
+150
Tstg (
C
)
Power Dissipation
300
P
D
(mW)
1)
1) When mounted on a grass epoxy board.
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RECOMMENDED OPERATING CONDITIONS
V
DD
=2.4V
5.5V
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ELECTRICAL CHARACTERISTICS
(V
+
=5V, Ta=25C)
PARAMETER SYSMBOL
CONDITION
MIN.
TYP.
MAX.
UNIT
Operating Current
I
DD
-
-
3.0
4.0
mA
Input Offset Voltage
V
IO
-
-10
-
-10
mV
Input Common Mode
Voltage Range
V
ICM
-
0.4
4.0
- - V
Maximum Output
Voltage Range
V
OM
Io=+100mA
4.70
4.80
-
V
Io= -100mA
-
0.20
0.30
Feedback Resistance
R
F
-
22.0 27.5 33.0
k
Open Loop Gain
Av -
-
80
-
dB
Preliminary
NJU7332
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Ver.2003-03-19
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TYPICAL CHARACTERISTICS
VDD vs. ICC
IN-=VDD, IN+=0V, VSS=0V
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
0
1
2
3
4
5
6
7
8
VDD(V)
I
CC(
mA
)
VDD-VOM(L level)
Iout=100mA, IN-=0V, IN+=VDD/2, VSS=0V
0
20
40
60
80
100
120
140
160
180
200
0
1
2
3
4
5
6
7
8
VDD(V)
V
DD(
mV
)
Io-Vom(
level)
VDD=5V, IN-=0V, IN+=VDD/2, VSS=0V
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
0
200
400
600
800
1000
1200
Io(mA)
Vo(V)
Preliminary
NJU7332
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Ver.2003-03-19
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TYPICAL CHARACTERISTICS
VDD-VOM(H level)
Iout=100mA, IN-=0V, IN+=VDD/2, VSS=0V
0
25
50
75
100
125
150
175
200
0
1
2
3
4
5
6
7
8
VDD(V)
VO
M(mV)
Io-Vom(
level)
VDD=5V, IN-=0V, IN+=VDD/2, VSS=0V
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
0
200
400
600
800
1000
1200
Io(mA)
Vom(V)
Preliminary
NJU7332
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Ver.2003-03-19
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APPLICATION NOTE
The NJU7332 is a single-phase DC brushless motor driver IC featuring CMOS process.
It is suitable for fan motor drivers for a small equipment such as the note personal computers.
[Application Circuit Example]
IN+
IN-
VDD
Ct
VSS
OUTB
OUTA
FG
Motor
Hall
element
C2
R1
R3
R2
FG out
NJU7332
V+
GND
C1
D1
[Design Notes]
Above application example is designed for 5V operation with motor current of 100mA. It uses the following
components:
Hall Elements: HW101A (AKE)
1. Selection of C1 and D1:
C1 is used for a noise reduction purpose. A typical value is 0.1uF.
Optimize the value in actual operating conditions if necessary. D1 is a diode for protection against reverse voltage
supply. Silicon rectifier diode (WO3C, 10D1 and equivalent) is appropriate.
2. Design of hall element bias resistance (R1 and R2)
Hall amplifier is a differential amplifier with hysteresis characteristics (24mV typical).
The common-mode input voltage is between 0.4V and VDD-1V and the input signal must be within the
range.Non-excitation hall bias voltage is to be set at a half of VDD for effective use of common-mode input voltage
range. Therefore the same value of hall bias resistors is selected for R1 and R2.
Given that the bias current is set to be 5mA by HW101A datasheet, R1 and R2 can be determined as
follows:
The output voltage of hall elements is influenced by the bias current and magnetic flux density of hall elements.
The optimum input voltage of NJU7332 is 100mVp-p and higher. With such input voltage, the highest efficiency can
be obtained.
=
=
=
=
=
+
+
-
300
2
1
1
10
5
5
2
1
3
R
R
k
Ihbias
VDD
Rin
R
R
The specifications on this data book are only given for information, without any
guarantee as regards either mistakes or omissions. The application circuit in this
data book are described only to show representative usages of the product and
not intended for the guarantee or permission of any right including the industrial
rights.
Preliminary
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