NJM2820, NJM2821, NJM2822
ADJUSTABLE HIGH PRECISION SHUNT REGULATOR
■GENERAL
DESCRIPTION
The
NJM2820/ 2821/ 2822
is a 1.25V precision shunt
regulator.
High precision voltage accuracy of ±0.7%* is realized by
the total optimization from chip design to packaging. In
addition, it features low cathode current of 80uA for low
current operation.
It is suitable for AC-DC converter secondary circuit,
reference voltage applications for A/D and D/A converters,
and other applications where precision reference is required.
■FEATURES
●
High Precision Voltage Reference
1.250V±0.7%
●
Flow Soldering*
●
Minimum Input Current
80uA typ.
●
Operating Voltage
V
REF
to 13V
●
Adjustable Output Voltage For External Resistance two Parts
●
Bipolar Technology
●
Package Outline
MTP5
■BLOCK
DIAGRAM
CATHODE
■PACKAGE
OUTLINE
NJM2820F
NJM2821F
NJM2822F
■PIN
CONFIGURATION
NC 1
ANODE 2
NC 3
4 REFERENCE
5 CATHODE
REFERENCE
NJM2820F
NC 1
5 REFERENCE
V
REF
ANODE 2
NC 3
4 CATHODE
NJM2821F
ANODE
NC 1
ANODE 2
CATHODE 3
5 ANODE
4 REFERENCE
NJM2822F
* These contents are based on the result that evaluated the arbitrary sample. The characteristic is not guaranteed. The design and
reliability that fully considered flow mounting are checked but the influence by temperature profile etc. is also considered. Please consult
with sales representatives for a recommendation temperature profile.
Ver 2.1
- 1 -
NJM2820, NJM2821, NJM2822
■ABSOLUTE
MAXIMUM RATINGS (Ta=25°C)
PARAMETER
SYMBOL
Cathode Voltage
V
KA
Continuous Cathode Current
I
K
Reference Input Current
I
REF
Power Dissipation
P
D
Operating Temperature Range
T
OPR
Storage Temperature Range
T
STG
MAXIMUM RATINGS
14
-30
∼
50
-10
∼
0.05
(MTP5)
200
-40
∼
+85
-40
∼
+150
UNIT
V
mA
mA
mW
°C
°C
■RECOMMENDED
OPERATING CONDITIONS (Ta=25°C)
PARAMETER
SYMBOL MIN.
TYP.
MAX.
Cathode Voltage
Cathode Current
V
KA
I
K
V
REF
0.5
–
–
13
30
UNIT
V
mA
■ELECTRICAL
CHARACTERISTICS (I
K
=1mA,Ta=25°C)
PARAMETER
SYMBOL
TEST CONDITION
Reference Voltage
Reference Voltage
Change vs. Cathode
Voltage Change
Reference Input Current
Minimum Input Current
Cathode Current
(Off Cond.)
Dynamic Impedance
V
REF
∆V
REF
/
∆V
KA
I
REF
I
MIN
I
OFF
Z
KA
V
KA
=V
REF
V
REF
≤V
KA
≤5V
5V≤V
KA
≤13V
(*1)
(*2)
(*2)
MIN.
1241
–
–
–
–
–
–
TYP.
1250
–
–
2.0
80
0.01
0.12
MAX.
1259
±2.7
±2.0
4.0
500
1.0
–
UNIT
mV
mV/V
mV/V
uA
uA
uA
Ω
(*2)
R1=10kΩ, R2=∞
V
KA
=V
REF
,
∆V
REF
=1% (*1)
(*3)
V
KA
=13V, V
REF
=0V
V
KA
= V
REF
, f≤1kHz
0.5mA≤I
K
≤30mA
(*1)
■TEMPERATURE
CHARACTERISTICS (I
K
=1mA,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=∞
(*1)
(*2)
MIN.
–
–
TYP.
±10
0.5
MAX.
–
–
UNIT
mV
uA
V
REF
···Reference
voltage includes error.
(*1): Test Circuit (Fig.1)
(*2): Test Circuit (Fig.2)
(*3): Test Circuit (Fig.3)
In case of NJM2822, all electrical characteristics are measured referencing to the anode terminal of PIN 5.
-2-
NJM2820, NJM2821, NJM2822
■TEST
CIRCUIT
INPUT
I
K
R1
I
REF
V
KA
INPUT
I
K
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
INPUT
I
OFF
V
KA
I
K
=1mA
10kΩ
470uF
10kΩ
Fig.3 I
OFF
to test circuit
Fig.4 Gain and Phase to test circuit
■POWER
DISSIPATION VS. AMBIENT TEMPERATURE
250
Power Dissipation P
D
(mW)
200
150
100
50
0
0
25
50
75
Ambient Temperature Ta (°C)
100
-3-
NJM2820, NJM2821, NJM2822
■TYPICAL
CHARACTERISTICS
Reference Voltage vs. Cathode Current
(V
KA
=V
REF
,Ta=25°C)
Reference Voltage V
REF
(mV)
Reference Voltage V
REF
(mV)
1260
1255
1250
1245
1240
1400
1200
1000
800
600
0
Reference Voltage vs. Cathode Current
(V
KA
=V
REF
,Ta=25°C)
0
10
20
30
20
40
60
80
100
Cathode Current I
K
(mA)
Reference Voltage Change vs. Cathode Voltage
(I
K
=1mA,R1=Variable,R2=10kΩ,Ta=25°C)
4
Reference Voltage Change
∆V
REF
(mV)
Cathode Current I
K
(uA)
Cathode Current (Off Cond.) vs. Cathode Voltage
(V
REF
=0V,Ta=25°C)
1
Cathode Current I
OFF
(nA)
0.8
0.6
0.4
0.2
0
3
2
1
0
0
5
10
15
Cathode Voltage V
KA
(V)
0
5
10
Cathode Voltage V
KA
(V)
15
Dynamic Impedance |Z
KA
| (Ω)
1.2
1
0.8
0.6
0.4
0.2
0
1
Dynamic Impedance
(I
K
=0.5~30mA,V
KA
=V
REF
,Ta=25°C)
80
60
Voltage Gain A
V
(dB)
40
20
0
-20
-40
-60
-80
100
Voltage Gain · Phase vs. Frequency
(Fig.4 Test Circuit,Ta=25°C)
360
270
90
0
-90
Phase
Φ
(deg)
180
Gain
Phase
-180
-270
-360
10M
10
100
1k
10k
100k
Cathode Current Frequency f (Hz)
1k
10k
100k
1M
Frequency f (Hz)
-4-
NJM2820, NJM2821, NJM2822
■TYPICAL
CHARACTERISTICS
Sefty Operating Boundary Condition
(V
KA
=V
REF
,Ta=25°C)
Stable Operaion Region
250
Cathode Current I
K
(uA)
200
150
100
50
Note)
Aunstable Operaion Region
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.
0
0.001
0.01
0.1
1
Output Capacetance Co (uF)
10
Reference Voltage vs. Temperature
(I
K
=1mA,V
KA
=V
REF
)
Reference Voltage V
REF
(mV)
1260
1255
1250
1245
1240
-50 -25
0
25
50
75 100 125 150
Reference Input Current I
REF
(uA)
3
Reference Input Current vs. Temperature
(I
K
=1mA,R1=10kΩ,R2= )
2.5
2
1.5
-50 -25
0
25
50
75 100 125 150
Ambient Temperature Ta (°C)
Output Noise Voltage vs. Temperature
(I
K
=1mA,V
KA
=V
REF
)
Ambient Temperature Ta (°C)
Cathode Current (Off Cond.) vs. Temperature
(V
KA
=13V,V
REF
=0V)
1
Cathode Current I
OFF
(uA)
0.8
0.6
0.4
0.2
0
-50 -25
0
25
50
75 100 125 150
Ambient emperature Ta (°C)
Output Noise Voltage
V
NO
(uVrms)
140
120
100
80
60
40
20
0
-50 -25
0
25
50
75 100 125 150
Ambient Temperature Ta (°C)
-5-
Microchip MCU
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