NJRC NJM2820 Adjustable high precision shunt regulator Datasheet

NJM2820, NJM2821, NJM2822
ADJUSTABLE HIGH PRECISION SHUNT REGULATOR
■GENERAL DESCRIPTION
■PACKAGE OUTLINE
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.
NJM2820F
NJM2821F
NJM2822F
■FEATURES
● High Precision Voltage Reference
1.250V±0.7%
● Flow Soldering*
● Minimum Input Current
80uA typ.
● Operating Voltage
VREF to 13V
● Adjustable Output Voltage For External Resistance two Parts
● Bipolar Technology
● Package Outline
MTP5
■BLOCK DIAGRAM
■PIN CONFIGURATION
CATHODE
5 CATHODE
NC 1
ANODE 2
NC 3
4 REFERENCE
NJM2820F
REFERENCE
NC 1
5 REFERENCE
ANODE 2
VREF
NC 3
4 CATHODE
NJM2821F
ANODE
NC 1
5 ANODE
ANODE 2
CATHODE 3
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
VKA
Continuous Cathode Current
IK
Reference Input Current
IREF
Power Dissipation
PD
Operating Temperature Range
TOPR
Storage Temperature Range
TSTG
MAXIMUM RATINGS
14
-30 ∼ 50
-10 ∼ 0.05
(MTP5)
200
-40 ∼ +85
-40 ∼ +150
■RECOMMENDED OPERATING CONDITIONS (Ta=25°C)
PARAMETER
SYMBOL MIN.
TYP.
MAX.
Cathode Voltage
Cathode Current
VKA
IK
VREF
0.5
–
–
13
30
■ELECTRICAL CHARACTERISTICS (IK=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
VREF
∆VREF/
∆VKA
IREF
IMIN
IOFF
ZKA
VKA=VREF
VREF≤VKA≤5V
5V≤VKA≤13V
(*1)
(*2)
(*2)
(*2)
R1=10kΩ, R2=∞
VKA=VREF, ∆VREF=1% (*1)
(*3)
VKA=13V, VREF=0V
VKA= VREF, f≤1kHz
0.5mA≤IK≤30mA
(*1)
■TEMPERATURE CHARACTERISTICS (IK=1mA,Ta=-40°C ∼ 85°C)
PARAMETER
SYMBOL
TEST CONDITION
Reference Voltage
Change
Reference Input Current
Change
∆VREF
VKA=VREF
(*1)
∆IREF
R1=10kΩ,R2=∞
(*2)
UNIT
V
mA
mA
mW
°C
°C
UNIT
V
mA
MIN.
TYP.
MAX.
UNIT
1241
–
1250
–
1259
±2.7
mV
mV/V
–
–
±2.0
mV/V
–
–
2.0
80
4.0
500
uA
uA
–
0.01
1.0
uA
–
0.12
–
Ω
MIN.
TYP.
MAX.
UNIT
–
±10
–
mV
–
0.5
–
uA
VREF···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
VKA
INPUT
VKA
IK
R1
R2
VREF
Fig.1 VKA=VREF to test circuit
VREF
Fig.2 VKA>VREF to test circuit
R1 

VO = VKA = VREF1 +
 + IREF × R1
 R2 
VO=VKA=VREF
INPUT
IK
IREF
VKA
IOFF
IK=1mA
10kΩ
470uF
10kΩ
Fig.3 IOFF to test circuit
Fig.4 Gain and Phase to test circuit
■POWER DISSIPATION VS. AMBIENT TEMPERATURE
Power Dissipation PD (mW)
250
200
150
100
50
0
0
25
50
75
Ambient Temperature Ta (°C)
100
-3-
NJM2820, NJM2821, NJM2822
Reference Voltage vs. Cathode Current
(VKA=VREF,Ta=25°C)
1260
Reference Voltage VREF (mV)
1255
1250
1245
1240
0
10
20
Reference Voltage vs. Cathode Current
(VKA=VREF,Ta=25°C)
1400
1200
1000
800
600
0
30
20
80
100
Cathode Current (Off Cond.) vs. Cathode Voltage
(VREF=0V,Ta=25°C)
1
Cathode Current IOFF (nA)
Reference Voltage Change
∆VREF (mV)
Reference Voltage Change vs. Cathode Voltage
(IK=1mA,R1=Variable,R2=10kΩ,Ta=25°C)
4
3
2
1
0.8
0.6
0.4
0.2
0
0
0
5
10
0
15
5
10
Cathode Voltage VKA (V)
Cathode Voltage VKA (V)
Dynamic Impedance
(IK=0.5~30mA,VKA=VREF,Ta=25°C)
1.2
80
Voltage Gain · Phase vs. Frequency
(Fig.4 Test Circuit,Ta=25°C)
60
1
Voltage Gain AV (dB)
Dynamic Impedance |ZKA| (Ω)
60
Cathode Current IK (uA)
Cathode Current IK (mA)
0.8
0.6
0.4
0.2
0
1
-4-
40
10
100
1k
10k
100k
Cathode Current Frequency f (Hz)
15
360
270
Gain
40
180
20
90
0
0
-20
-90
Phase
-40
-60
-80
100
-180
-270
1k
10k
100k
1M
Frequency f (Hz)
-360
10M
Phase Φ (deg)
Reference Voltage VREF (mV)
■TYPICAL CHARACTERISTICS
NJM2820, NJM2821, NJM2822
■TYPICAL CHARACTERISTICS
250
Sefty Operating Boundary Condition
(VKA=VREF,Ta=25°C)
Cathode Current I K (uA)
Stable Operaion Region
200
150
Note)
100
50
Aunstable Operaion Region
0
0.001
0.01
0.1
1
Output Capacetance Co (uF)
10
1255
1250
1245
1240
0
25
50
75 100 125 150
3
Reference Input Current vs. Temperature
(IK=1mA,R1=10kΩ,R2= )
2.5
2
1.5
-50 -25
0
25
50
75 100 125 150
Ambient Temperature Ta (°C)
Ambient Temperature Ta (°C)
Cathode Current (Off Cond.) vs. Temperature
(VKA=13V,VREF=0V)
1
Output Noise Voltage vs. Temperature
(IK=1mA,VKA=VREF)
140
Output Noise Voltage
VNO (uVrms)
Cathode Current IOFF (uA)
-50 -25
Reference Input Current IREF (uA)
Reference Voltage VREF (mV)
Reference Voltage vs. Temperature
(IK=1mA,VKA=VREF)
1260
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.
0.8
0.6
0.4
0.2
120
100
80
60
40
20
0
0
-50 -25
0
25
50
75 100 125 150
Ambient emperature Ta (°C)
-50 -25
0
25
50
75 100 125 150
Ambient Temperature Ta (°C)
-5-
NJM2820, NJM2821, NJM2822
MEMO
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook 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.
-6-
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