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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 1.250V0.7% 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
CATHODE
PACKAGE OUTLINE
NJM2820F NJM2821F NJM2822F
PIN CONFIGURATION
NC 1 ANODE 2 NC 3 4 REFERENCE 5 CATHODE
REFERENCE
NJM2820F
NC 1 5 REFERENCE
VREF
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=25C) 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
UNIT V mA mA mW C C
RECOMMENDED OPERATING CONDITIONS (Ta=25C) PARAMETER SYMBOL MIN. TYP. MAX. Cathode Voltage Cathode Current VKA IK VREF 0.5 - - 13 30
UNIT V mA
ELECTRICAL CHARACTERISTICS (IK=1mA,Ta=25C) 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 VREFVKA5V 5VVKA13V (*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
(*2) R1=10k, R2= VKA=VREF, VREF=1% (*1) (*3) VKA=13V, VREF=0V VKA= VREF, f1kHz 0.5mAIK30mA (*1)
TEMPERATURE CHARACTERISTICS (IK=1mA,Ta=-40C 85C) PARAMETER SYMBOL TEST CONDITION Reference Voltage Change Reference Input Current Change VREF IREF VKA=VREF R1=10k,R2= (*1) (*2)
MIN. - -
TYP. 10 0.5
MAX. - -
UNIT mV 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.
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NJM2820, NJM2821, NJM2822
TEST CIRCUIT
INPUT IK
R1 IREF
VKA
INPUT IK
VKA
VREF
R2
VREF
Fig.1 VKA=VREF to test circuit VO=VKA=VREF
Fig.2 VKA>VREF to test circuit
R1 VO = VKA = VREF1 + + IREF x R1 R2
INPUT IOFF
VKA IK=1mA 10k 470uF 10k
Fig.3 IOFF to test circuit
Fig.4 Gain and Phase to test circuit
POWER DISSIPATION VS. AMBIENT TEMPERATURE
250 Power Dissipation PD (mW) 200 150 100 50 0 0 25 50 75 Ambient Temperature Ta (C) 100
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NJM2820, NJM2821, NJM2822
TYPICAL CHARACTERISTICS
Reference Voltage vs. Cathode Current (VKA=VREF,Ta=25C)
Reference Voltage VREF (mV)
Reference Voltage VREF (mV)
1260 1255 1250 1245 1240
1400 1200 1000 800 600 0
Reference Voltage vs. Cathode Current (VKA=VREF,Ta=25C)
0
10
20
30
20
40
60
80
100
Cathode Current IK (mA)
Reference Voltage Change vs. Cathode Voltage (IK=1mA,R1=Variable,R2=10k,Ta=25C) 4 Reference Voltage Change VREF (mV)
Cathode Current IK (uA)
Cathode Current (Off Cond.) vs. Cathode Voltage (VREF=0V,Ta=25C) 1 Cathode Current IOFF (nA) 0.8 0.6 0.4 0.2 0
3 2 1 0 0 5 10 15 Cathode Voltage VKA (V)
0
5 10 Cathode Voltage VKA (V)
15
Dynamic Impedance |ZKA| ()
1.2 1 0.8 0.6 0.4 0.2 0 1
Dynamic Impedance (IK=0.5~30mA,VKA=VREF,Ta=25C)
80 60 Voltage Gain AV (dB) 40 20 0 -20 -40 -60 -80 100
Voltage Gain * Phase vs. Frequency (Fig.4 Test Circuit,Ta=25C)
360 270 90 0 -90 Phase (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)
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NJM2820, NJM2821, NJM2822
TYPICAL CHARACTERISTICS
Sefty Operating Boundary Condition (VKA=VREF,Ta=25C)
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 (IK=1mA,VKA=VREF) Reference Voltage VREF (mV) 1260 1255 1250 1245 1240 -50 -25 0 25 50 75 100 125 150 Reference Input Current IREF (uA)
3
Reference Input Current vs. Temperature (IK=1mA,R1=10k,R2= )
2.5
2
1.5 -50 -25 0 25 50 75 100 125 150 Ambient Temperature Ta (C)
Output Noise Voltage vs. Temperature (IK=1mA,VKA=VREF)
Ambient Temperature Ta (C)
Cathode Current (Off Cond.) vs. Temperature (VKA=13V,VREF=0V) 1 Cathode Current IOFF (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 VNO (uVrms)
140 120 100 80 60 40 20 0
-50 -25
0
25
50
75 100 125 150
Ambient Temperature Ta (C)
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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.
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