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CORPORATION
FEATURES
Trimmed 0.5% Bandgap Reference
Nominal Temperature Range Extended to 105oC
Temperature-Compensated: 30ppm/oC
Internal Amplifier with 150mA Capability
Low Output Noise
Low Frequency Dynamic Output Impedance
PIN CONFIGURATION (Top View)
Precision Adjustable
Shunt Reference
CL431
DESCRIPTION
The CL431 is an adjustable shunt regulator designed to act as
an open-loop error amplifier with a 2.5V temperature
compensated reference. Its highly accurate 0.5% bandgap
reference is perfect for applications requiring stability and
accuracy over temperature and life.
Sharp turn-on characteristics and a low temperature
coefficient make the CL431 an excellent replacement for
many zener diode applications, programmable to any value
greater than 2.5V and up to 36V by using two external
resistors. As a combination error amplifier and reference, it
can be used to manage control loops such as switching power
supplies.
The CL431 can be used as a direct replacement for the
standard TL431.
ORDERING INFORMATION
Part
CL431LP
CL431D
CL431S
Package
Temperature Range
TO-92
8-Pin Plastic SOIC
SOT-89
0 to 105oC
0 to 105oC
0 to 105oC
TO-92 (LP)
CATHODE
ANODE
REFERENCE
1G-33
CATHODE 1
ANODE 2
ANODE 3
N/C 4
SOIC (D)
8 REFERENCE
7 ANODE
6 ANODE
5 N/C
1G-34
SOT-89 (S)
CATHODE
ANODE
REFERENCE
1G-35
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025

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CL431
CORPORATION
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
RATING
UNITS
VKA
IAK
IKA
IREF
PD
TJ
TSTG
TL
Cathode-Anode Reverse Breakdown
Anode-Cathode Forward Current
Operating Cathode Current
Reference Input Current
Continuous Power at 25oC
TO-92
8L SOIC
SOT-89
Junction Temperature
Storage Temperature
Lead Temperature, Soldering 10 Seconds
37
1
250
10
775
750
1000
150
–65 to 150
300
V
A
mA
mA
mW
mW
mW
oC
oC
oC
Exceeding ABSOLUTE MAXIMUM RATINGS may cause permanent damage. Extended operation of the device at these or any other conditions
above those indicated in the operational sections of this specification is not recommended as it may adversely affect reliability and performance.
RECOMMENDED CONDITIONS
SYMBOL
PARAMETER
VKA Cathode Voltage
IK Cathode Current
RATING
VREF to 20
10
UNIT
V
mA
FUNCTIONAL BLOCK DIAGRAM
TYPICAL THERMAL RESISTANCE
PACKAGE
TO-92
SOIC
SOT-89
θJA
160oC/W
175oC/W
110oC/W
θJC
80oC/W
45oC/W
8oC/W
TYPICAL DERATING
6.3mW/oC
5.7mW/oC
9.1mW/oC
CATHODE (K)
REFERENCE (R)
+
2.5V
ANODE (A)
1G-36
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025

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CORPORATION
CL431
ELECTRICAL CHARACTERISTICS
Electrical Characteristics are guaranteed over full junction temperature range (0 to 105oC). Ambient temperature must be derated based on
power dissipation and package thermal characteristics. The conditions are: VKA = VREF and IK = 10mA unless otherwise stated.
SYMBOL
PARAMETER
VREF
TC
Reference Voltage
VREF with Temp.*
CL431 (0.5%)
MIN TYP
2.490
2.503
2.469
0.07
MAX
2.515
2.536
0.20
UNIT
TEST
CIRCUIT
TEST CONDITION
V 1 TA = 25oC
V 1 Over Temp.
mV/ oC
1
VREF
VK
Ratio of Change in VREF to
Cathode Voltage
–2.7
–2
–1.0
–0.4
VREF to 10V
mV/V
2
0.3 10V to 36V
IREF Reference Input Current
0.7 4 µA 2
IREF
IREF Temp Deviation
0.4 1.2 µA 2 Over Temp.
IK(MIN)
Min IK for Regulation
0.4 1 mA 1
IK(OFF)
Off State Leakage
0.04
250 nA
3 VREF = 0V, VKA = 36V
ZKA Dynamic Output Impedance
0.15 0.5 1 f 1kHz, IK = 1 to 150mA
*CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC)
000
5000
–10
0.5
VREF
T
0 15 30 45 60 75 90 105
TEMPERATURE (˚C)
0.07 mV/˚C
0.003 %/˚C
27 ppm/˚C
1G-37
TC
in
mV/oC
=
VREF (mV)
TA
TC in %/oC =
VREF
VREF
at
25oC
TA
x 100
VREF
TC
in
ppm/oC
=
VREF
at 25oC
TA
x 106
TEST CIRCUITS
VIN
I REF
VKA = VREF
IK
VIN
R1
(VREF )
R2
I REF
VKA
IK
VIN VKA
I K(OFF)
1G-38
TEST CIRCUIT 1
1G-39
TEST CIRCUIT 2
1G-40
TEST CIRCUIT 3
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025

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CL431
CORPORATION
TYPICAL PERFORMANCE CURVES
LOW CURRENT OPERATING
CHARACTERISTICS
900
800 VKA = VREF
TEMPERATURE RANGE: –55 to 125˚C
700
600
500
400 125˚C
300 25˚C
200 –55˚C
100
0
–100
–200
–1.0
0
1.0 2.0 3.0
VKA – CATHODE VOLTAGE (V) 1G-41
OFF STATE LEAKAGE
100
VKA = 36V
VREF = 0V
10
1
0.1
0.01
–60 –30 0 30 60 90 120
TA – AMBIENT TEMPERATURE (˚C) 1G-43
REFERENCE
INPUT CURRENT
3.0
R1 = 10k
R2 =
2.5 I K = 10mA
2.0
1.5
1.0
0.5
0
–60 –30 0 30 60 90 120
TA – AMBIENT TEMPERATURE (˚C) 1G-45
HIGH CURRENT OPERATING
CHARACTERISTICS
150
VKA = VREF
125 TEMPERATURE RANGE: –55 to 125˚C
100
75
50
25
0
–25
–50
–75
–100
–2 –1
0
1
2
VKA – CATHODE VOLTAGE (V)
3
1G-42
TEMPERATURE COEFFICIENT AS
A FUNCTION OF TRIM VALUE
2.54
VKA = VREF
2.53 I K = 10mA
2.52
2.51
2.50
2.49 VREF = 2.503V AT 25˚C
2.48
2.47
2.46
–60 –30 0 30 60 90 120
TA – AMBIENT TEMPERATURE 1G-44
REFERENCE VOLTAGE
LINE REGULATION
0
–10
–20
–55˚C
0˚C
25˚C
–30
75˚C
125˚C
–40
I K = 10mA
–50 TEMPERATURE RANGE: –55 to 125˚C
0 3 6 9 12 15 18 21 24 27 30
VKA – CATHODE VOLTAGE (V) 1G-46
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025

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CORPORATION
CL431
TYPICAL PERFORMANCE CURVES (continued)
NOISE VOLTAGE
70
60
50
40
30
20
VKA = VREF
10 I K = 10mA
0 TA = 25˚C
10 100 1k 10k
f – FREQUENCY (Hz)
100k
1G-47
LOW FREQUENCY DYNAMIC
OUTPUT IMPEDANCE
0.150
VKA = VREF
0.125
I KA = 1 TO 100mA
f 1kHz
0.100
0.075
0.050
0.025
0.0
–60 –30 0 30 60 90 120
TA – FREE AIR TEMPERATURE 1G-48
DYNAMIC OUTPUT
IMPEDANCE
100
TA = 25˚C
I K = 1 TO 100mA
10
1.0
0.1
0.01
1k
10k 100k 1M
f – FREQUENCY (Hz)
10M
1G-49
SMALL SIGNAL GAIN
vs FREQUENCY
70
60
50 TA = 25˚C
I K = 10mA
40
30
20
10
0
1k 10k 100k 1M 10M
f – FREQUENCY (Hz)
1G-50
15k
9µF
8.25k
IK
OUT
230
GND
1H-01
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025