JIANGSU CHANGJIANG ELECTRONICS TECHNOLOGY CO., LTD
SOT-23 Encapsulate Adjustable Reference Source
CJ431 Adjustable Accurate Reference Source
DEVICE DESCRIPSION
The CJ431 is a three-terminal adjustable shunt regulator offering
excellent temperature stability . This device has a typical dynamic output
impedance of 0.2Ω. The device can be used as a replacement for zener
diodes in many applications.
FEATURES
z The output voltage can be adjusted to 36V
z Low dynamic output impedance, its typical value is 0.2Ω
z Trapping current capability is 1 to 100mA
z Low output noise voltage
z Fast on -state response
z The effective temperature compensation in the working range of full temperature
z The typical value of the equivalent temperature factor in the whole temperature scope is 50 ppm/℃
APPLICATION
z Shunt Regulator
z High-Current Shunt Regulator
z Precision Current Limiter
ABSOLUTE MAXIMUM RATINGS (Operating temperature range applies unless otherwise specified)
Parameter Symbol Value Unit
Cathode Voltage VKA 37 V
Cathode Current Range (Continuous) IKA -100~+150 mA
Reference lnput Current Range Iref 0.05~+10 mA
Power Dissipation PD 300 mW
Storage temperature Range Tstg -65~+150 ℃
SOT-23
1. REFERENCE
2. CATHODE
3. ANODE
C,Jan,2011
Operating Junction Temperature Tj 150 ℃
Operating Ambient Temperature Range Topr 0~+70 ℃
Thermal Resistance from Junction
to Ambient RθJA 417 ℃/W
G,Apr,2013
ELECTRICAL CHARACTERISTICS (Ta=25℃ unless otherwise specified)
Parameter Symbol Test conditions Min Typ Max Unit
Reference input voltage (Fig.1) Vref V
KA=VREF, IKA=10mA 2.450 2.5 2.550 V
Deviation of reference input voltage
over temperature (note) (Fig.1) V△ref /T△ VKA =VREF, IKA =10mA
Tmin≤Ta≤Tmax 4.5 17 mV
V△KA
=10V~VREF -1.0 -2.7 mV/V
Ratio of change in reference input
voltage to the change in cathode
voltage (Fig.2)
V△ref /V△KA IKA=10mA △VKA
=36V~ 10V -0.5 -2.0 mV/V
Reference input current (Fig.2) lref IKA= 10mA,R1=10kΩ
R2=∞ 1.5 4 μA
Deviation Of reference input current
over full temperature range (Fig.2) l△ref /T△
lKA=10mA, R1=10kΩ
R2=∞
Ta=full Temperature
0.4 1.2 μA
Minimum cathode current for
regulation (Fig.1) IKA(min) V
KA=VREF 0.45 1.0 mA
Off-state cathode Current (Fig.3) IKA(OFF) V
KA=36V,VREF=0 0.05 1.0 μA
Dynamic impedance ZKA VKA=VREF, lKA=1 to 100mA
f≤1.0kHz 0.15 0.5 Ω
note: TMIN=0℃ ,TMAX=+70℃
CLASSIFICATION RI Vref
Rank 0.5% 1%
Range 2.487-2.513 2.475-2.525
G,Apr,2013
-2 -1 0 1 2 3
-100
-50
0
50
100
150
-1.0 -0.5 0.0 0.5 1.0 1.5 2.0 2.5 3.0
-200
-100
0
100
200
300
400
500
600
700
800
VKA=Vref
Ta=25℃
Cathode Current versus
Cathode Voltage
VKA, CATHODE VOLTAGE (V)
IK, CATHODE CURRENT (mA)
VKA=Vref
Ta=25℃
CJ431
Typical Characteristics
Cathode Current versus
Cathode Voltage
IK, CATHODE CURRENT (uA)
VKA, CATHODE VOLTAGE (V)
IKA(min)
KA
KA
ref
Test Circuit for VKA=Vref
G,Apr,2013
-40-200 20406080100
0
5
10
15
20
25
30
35
40
45
50
0 5 10 15 20 25 30 35 40
-20
-16
-12
-8
-4
0
-40-200 20406080100
0
100
200
300
400
500
600
700
VKA=36V
Vref=0V
Off-State Cathode Current
versus Ambient Temperature
Ta, AMBIENT TEMPERATURE ( )℃
Ioff, OFF-STATE CATHODE CURRENT (nA)
IK=10mA
Ta=25℃
Change in Reference Input
Voltage versus Cathode Voltage
V△ref, REFERENCE INPUT VOLTAGE (mV)
VKA, CATHODE VOLTAGE (V)
IK=10mA
R1=10KΩ
Reference Input Current versus
Ambient Temperature
Ta, AMBIENT TEMPERATURE ( )℃
Iref, REFERENCE INPUT CURRENT (nA)
Test Circuit for Iref
Test Circuit for Ioff
Test Circuit for VKA=Vref(1+R1/R2)+R1*Iref
G,Apr,2013
