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Precision Adjustable
Shunt Reference
CORPORATION
CL2431
FEATURES
Temperature-Compensated: 30ppm/oC
Trimmed 0.5% Bandgap Reference
Internal Amplifier with 100mA Capability
Temperature Range: Extended to 0 to 105oC
Low Frequency Dynamic Output Impedance: < 150m
Low Output Noise
SOT-23 Replacement for TL431
PIN CONFIGURATION (Top View)
DESCRIPTION
The CL2431 is a three terminal adjustable voltage reference
designed to act as an open-loop error amplifier with a 2.5V
temperature compensated reference. Operating as a low
temperature coefficient zener which is programmable from
VREF to 18V with two external resistors while providing a wide
operating current range of 1.0mA to 100mA with a typical
dynamic impedance of 0.15. As a shunt regulator the
device can be used as either a positive or negative voltage
reference. Active output circuitry provides a very sharp
turn-on characteristic, making the CL2431 an excellent
replacement for low-voltage zener diodes in many
applications, including on-board regulation and adjustable
power supplies.
ORDERING INFORMATION
Part Package Tolerance
CL2431VS
CL2431AVS
CL2431IVS
CL2431IAVS
SOT-23
SOT-23
SOT-23
SOT-23
1.0%
0.5%
1.0%
0.5%
Temperature Range
0 to +105oC
0 to +105oC
-40 to +85oC
-40 to +85oC
ANODE
SOT-23 (VS)
CATHODE
REFERENCE
1J-22
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025

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CORPORATION
CL2431
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 Dissipation at 25oC
SOT-23
Junction Temperature
Storage Temperature
Lead Temperature, Soldering 10 Seconds
18
1
100
1
200
150
–65 to 150
300
V
A
mA
mA
mW
oC
oC
oC
Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification
is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
RECOMMENDED CONDITIONS
SYMBOL
PARAMETER
VKA Cathode Voltage
IK Cathode Current
RATING
VREF to 18
10
UNIT
V
mA
TYPICAL THERMAL RESISTANCES
PACKAGE
SOT-23
θJA
575oC/W
θJC
150oC/W
TYPICAL DERATING
1.7mW/oC
FUNCTIONAL BLOCK DIAGRAM
REFERENCE (R)
CATHODE (K)
+
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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CL2431
CORPORATION
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
Reference Voltage
TC VREF with Temp.*
MIN
2.490
2.470
TYP
2.500
2.500
0.6
MAX
2.515
2.520
0.2
UNIT
V
V
mV/ oC
CIRCUIT
1
1
1
TEST CONDITION
TA = 25oC, 0.5% CL2431A
TA = 25oC, 1.0% CL2431
VREF
VK
Ratio of Change in VREF to
Cathode Voltage
–2.7
–2
–1.01
–0.4
mV/V
VREF to 10V
2
0.3 10V to 18V
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 = 18V
ZKA Dynamic Output Impedance
0.15 0.5 1 f 1kHz, IK = 1 to 100mA
*CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC)
000
2000 0.2 –5
VREF
T
TEST CIRCUITS
VIN
I REF
–10
0
15 30 45 60 75 90 105
TEMPERATURE (˚C)
0.019 mV/˚C
0.001 %/˚C
7.6 ppm/˚C
1J-28
VKA = VREF
IK
VIN
R1
(VREF )
R2
I REF
VKA
IK
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
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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CORPORATION
CL2431
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 = 18V
VREF = 0V
10
1
0.1
0.01
–60 –30 0 30 60 90 120
TA – AMBIENT TEMPERATURE (˚C) 1P-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
2.53
VKA = VREF
2.52 I K = 10mA
2.51
2.50
2.49
VREF = 2.500V AT 25˚C
2.48
2.47
2.46
2.45
–60 –30 0 30 60 90 120
TA – AMBIENT TEMPERATURE (˚C) 1J-29
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
VKA – CATHODE VOLTAGE (V)
18
1J-30
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025

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CL2431
CORPORATION
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 VOLTAGE GAIN
vs FREQUENCY
70
TEMPERATURE RANGE: –55 to 125˚C
60
50
I K = 10mA
40
30
20
10
0
1k 10k 100k 1M 10M
f – FREQUENCY (Hz)
1J-31
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