NJM1431A
ADJUSTABLE HIGH PRECISION SHUNT REGULATOR
■GENERAL
DESCRIPTION
The
NJM1431A
is a precision shunt regulator.
Compared to the conventional 431, The
NJM1431A
offers
higher voltage accuracy and small package availability to
support a wide range of applications.
NJM1431AU
NJM1431AF
■PACKAGE
OUTLINE
■FEATURES
●
Operating Voltage
V
REF
to 36V
●
Precision Voltage Reference
2.465V±1%
●
1.6mm × 1.2mm to ESON4 package
●
Adjustable Output Voltage
●
Bipolar Technology
●
Package Outline
NJM1431AU
: SOT89 (3pin)
NJM1431AF
: SOT-23-5 (MTP5)
NJM1431AKF1
: ESON4-F1
NJM1431AKF1
■BLOCK
DIAGRAM
CATHODE
■PIN
CONFIGURATION
REFERENCE
1
2
3
1. REFERENCE
2. ANODE
3. CATHODE
NJM1431AU
V
REF
NC 1
ANODE 2
NC 3
ANODE
5 REFERENCE
4 CATHODE
NJM1431AF
REFERENCE 1
CATHODE
2
4
3
ANODE
NC
4
3
1
2
Exposed PAD on backside
connect to ANODE.
(Top View)
NJM1431AKF1
(Bottom View)
Ver.2010-03-26
-1-
NJM1431A
■ABSOLUTE
MAXIMUM RATINGS (Ta=25°C)
PARAMETER
SYMBOL
Cathode Voltage
V
KA
Continuous Cathode Current
I
K
Reference Input Current
I
REF
Power Dissipation
Operating Temperature Range
Storage Temperature Range
P
D
T
OPR
T
STG
°C
°C
(*1): Mounted on glass epoxy board based on EIA/JEDEC. (101.5 × 114.57 × 1.6mm: 2Layers)
(*2): Mounted on glass epoxy board based on EIA/JEDEC.
(101.5 × 114.57 × 1.6mm: 4Layers Internal foil area: 99.5 × 99.5mm)
■RECOMMENDED
OPERATING CONDITIONS (Ta=25°C)
PARAMETER
SYMBOL
MIN.
TYP.
Cathode Voltage
V
KA
V
REF
–
Cathode Current
I
K
1
–
■ELECTRICAL
CHARACTERISTICS (I
K
=10mA, Ta=25°C)
PARAMETER
Reference Voltage
Reference Voltage
Change vs. Cathode
Voltage Change
Reference Input Current
Minimum Input Current
Cathode Current
(Off Cond.)
Dynamic Impedance
SYMBOL
V
REF
∆V
REF
/
∆V
KA
I
REF
I
MIN
I
OFF
⎮Z
KA
⎮
TEST CONDITION
V
KA
=V
REF
⎮V
REF
⎮≤
V
KA
≤
10V
10V
≤
V
KA
≤
36V
R1=10kΩ, R2=∞
V
KA
=V
REF
,
∆V
REF
=1%
V
KA
=36V, V
REF
=0V
V
KA
= V
REF
, f≤1kHz
1mA
≤
I
K
≤
100mA
(*3)
(*4)
(*4)
(*4)
(*3)
(*5)
(*3)
MIN.
2.440
–
–
–
–
–
–
TYP.
2.465
±1.4
±1.0
2
0.4
0.1
0.2
MAX.
2.490
±2.7
±2.0
4
1.0
1.0
0.5
UNIT
V
mV/V
mV/V
uA
mA
uA
Ω
MAXIMUM RATINGS
+37
-100 ~ 150
-0.05 ~ 10
SOT89 (3pin)
350
SOT-23-5
200
ESON4-F1
412 (*1)
1,150 (*2)
-40 ~ +85
-40 ~ +150
UNIT
V
mA
mA
mW
MAX.
36
100
UNIT
V
mA
■TEMPERATURE
CHARACTERISTICS (I
K
=10mA, Ta= -40°C ~ 85°C)
PARAMETER
SYMBOL
TEST CONDITION
Reference Voltage
Change
Reference Input Current
Change
∆V
REF
∆I
REF
V
KA
=V
REF
R1=10kΩ, R2=∞
(*3)
(*4)
MIN.
–
–
TYP.
8
0.4
MAX.
17
1.2
UNIT
mV
uA
The maximum value of “Dynamic Impedance“, “Reference Voltage Change” and “Reference Input Current Change”
are determined based on sampling evaluation from the 5 initial production lots, and thus not tested in the production test.
Therefore, these values are for the reference design purpose only.
⎮V
REF
⎮···Reference
voltage includes error.
(*3): Test Circuit (Fig.1)
(*4): Test Circuit (Fig.2)
(*5): Test Circuit (Fig.3)
-2-
Ver.2010-03-26
NJM1431A
■TEST
CIRCUIT
INPUT
I
K
V
KA
INPUT
R1
I
K
I
REF
V
KA
INPUT
I
OFF
V
KA
V
REF
R2
V
REF
Fig.1 V
KA
=V
REF
to test circuit
V
O
=V
KA
=V
REF
Fig.2 V
KA
>V
REF
to test circuit
R1
⎞
⎛
V
O
=
V
KA
=
V
REF
⎜
1
+
⎟ +
I
REF
×
R1
R2
⎠
⎝
Fig.3 I
OFF
to test circuit
■POWER
DISSIPATION VS. AMBIENT TEMPERATURE
Power Dissipation vs. Ambient Temparaure
1200
(mW)
1000
800
600
400
200
0
-50
SOT89 (3pin)
SOT-23-5
ESON4-F1
At on 4 layer PC board
At on 2 layer PC board
(Topr=-40~+85 C, Tj=
∼
150 C)
o
o
Power Dissipation P
D
-25
0
25
50
75
Ambient Temperature Ta (
o
C)
100
Ver.2010-03-26
-3-
NJM1431A
■TYPICAL
CHARACTERISTICS
Reference Voltage vs. Cathode Current
2.5
Reference Voltage V
REF
(V)
2.48
2.46
2.44
2.42
2.4
0.1
(V
KA
=V
REF
, Ta=25 C)
o
2.49
Reference Voltage V
REF
(V)
2.48
2.47
2.46
2.45
Reference Voltage vs. Temperature
(V
KA
=V
REF
, I
K
=10mA)
1
10
Cathode Current I
K
(mA)
100
2.44
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (
o
C)
Reference Voltage vs. Cathode Voltage
(I
K
=10mA, R1=Variable, R2=10kΩ, Ta=25
o
C)
2.49
Reference Voltage V
REF
(V)
2.48
2.47
2.46
2.45
2.44
Reference Input Current I
REF
(uA)
2
1.5
1
0.5
Reference Input Current vs. Temperature
(I =10mA, R1=10kΩ, R2= )
K
0
-50 -25 0 25 50 75 100 125 150
Ambient Temperature Ta (
o
C)
8
0
10
20
30
Cathode Voltage V
KA
(V)
40
Dynamic Impedance
(I =1 to 100mA, V =V
0.5
Dynamic Impedance |Z
KA
| (Ω)
0.4
0.3
0.2
0.1
0
0.001 0.01
0.1
1
10
100
Cathode Current Frequency f (kHz)
K
KA
REF
, Ta=25
o
C)
-4-
Ver.2010-03-26
NJM1431A
■TYPICAL
CHARACTERISTICS
Safety Operating Boundary Condition
100
Cathode Current I
K
(mA)
80
60
Stable
40 Operaion
Region
20
0
0.01
V
+
(Rin=30Ω, V
KA
=V
REF
, Ta=25
o
C)
Ceramic Capacitor
Safety Operating Boundary Condition
Test Circuit
Rin=30Ω
V
KA
I
K
C
OUT
Unstable Operaion
Region
0.1
1
Output Capacitor C
OUT
(µF)
10
Note) Oscillation might occur while operating within the range of
safety curve.
So that, it is necessary to make ample margins by taking
considerations of fluctuation of the device.
Safety Operating Boundary Condition
(Rin=30Ω, V =V
100
Cathode Current I (mA)
80
60
40
20
0
0.1
Unstable Operaion
Region
Stable Operaion
Region
KA
REF
, Ta=25 C)
o
Aluminum Electrolytic Capacitor
K
1
Output Capacitor C
10
(µF)
OUT
Ver.2010-03-26
-5-
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