CJ431

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.
SOT-23
1. REFERENCE
2. CATHODE
FEATURES
3. ANODE
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)
Symbol
Value
Unit
Cathode Voltage
Parameter
VKA
37
V
Cathode Current Range (Continuous)
IKA
-100~+150
mA
Reference lnput Current Range
Iref
0.05~+10
mA
Power Dissipation
PD
Thermal Resistance from Junction
to Ambient
RθJA
417
℃/W
Operating Junction Temperature
Tj
150
℃
Operating Ambient Temperature Range
Topr
0~+70
℃
-65~+150
℃
Storage temperature Range
Tstg
300
mW
G,Apr,2013
C,Jan,2011
ELECTRICAL CHARACTERISTICS (Ta=25℃ unless otherwise specified)
Parameter
Reference input voltage (Fig.1)
Deviation of reference input voltage
over temperature (note) (Fig.1)
Symbol
Test
Vref
conditions
VKA=VREF, IKA=10mA
VKA =VREF, IKA =10mA
△Vref /△T
Deviation Of reference input current
over full temperature range (Fig.2)
Minimum cathode current for
regulation (Fig.1)
Off-state cathode Current (Fig.3)
Dynamic impedance
V
-1.0
-2.7
mV/V
-0.5
-2.0
mV/V
1.5
4
μA
0.4
1.2
μA
VKA=VREF
0.45
1.0
mA
VKA=36V,VREF=0
0.05
1.0
μA
0.15
0.5
Ω
IKA=10mA
=10V~VREF
△VKA
=36V~ 10V
lref
2.550
Unit
mV
voltage (Fig.2)
Reference input current (Fig.2)
2.5
Max
17
△VKA
△Vref /△VKA
2.450
Typ
4.5
Tmin≤Ta≤Tmax
Ratio of change in reference input
voltage to the change in cathode
Min
IKA= 10mA,R1=10kΩ
R2=∞
lKA=10mA, R1=10kΩ
△lref /△T
R2=∞
Ta=full Temperature
IKA(min)
IKA(OFF)
ZKA
VKA=VREF, lKA=1 to 100mA
f≤1.0kHz
note: TMIN=0℃ ,TMAX=+70℃
CLASSIFICATION RI Vref
Rank
Range
0.5%
2.487-2.513
1%
2.475-2.525
G,Apr,2013
CJ431
Typical Characteristics
Cathode Current versus
Cathode Voltage
IK, CATHODE CURRENT
(mA)
150
100
50
0
-50
VKA=Vref
-100
Ta=25℃
-2
-1
0
1
2
VKA, CATHODE VOLTAGE
3
(V)
KA
Cathode Current versus
Cathode Voltage
800
IK, CATHODE CURRENT
(uA)
700
KA
600
IKA(min)
500
400
300
200
100
0
-200
-1.0
ref
VKA=Vref
-100
Ta=25℃
-0.5
0.0
0.5
1.0
1.5
VKA, CATHODE VOLTAGE
2.0
2.5
3.0
(V)
Test Circuit for VKA=Vref
G,Apr,2013
Change in Reference Input
Voltage versus Cathode Voltage
0
△Vref, REFERENCE INPUT VOLTAGE
(mV)
IK=10mA
Ta=25℃
-4
-8
-12
-16
-20
0
5
10
15
20
25
VKA, CATHODE VOLTAGE
(nA)
Test Circuit for VKA=Vref(1+R1/R2)+R1*Iref
500
400
300
200
100
IK=10mA
R1=10KΩ
-20
0
20
40
60
Ta, AMBIENT TEMPERATURE
80
100
Test Circuit for Iref
(℃)
Off-State Cathode Current
versus Ambient Temperature
50
(nA)
40
600
0
-40
Ioff, OFF-STATE CATHODE CURRENT
35
Reference Input Current versus
Ambient Temperature
700
Iref, REFERENCE INPUT CURRENT
30
(V)
45
40
35
30
25
20
15
10
VKA=36V
5
0
-40
Vref=0V
-20
0
20
40
Ta, AMBIENT TEMPERATURE
60
80
100
Test Circuit for Ioff
(℃)
G,Apr,2013