CALOGIC CL2431AVS Precision adjustable shunt reference Datasheet

Precision Adjustable
Shunt Reference
CORPORATION
CL2431
FEATURES
•
•
•
•
•
•
•
o
Temperature-Compensated: 30ppm/ C
Trimmed 0.5% Bandgap Reference
Internal Amplifier with 100mA Capability
Temperature Range: Extended to 0 to 105oC
Low Frequency Dynamic Output Impedance: < 150mΩ
Low Output Noise
SOT-23 Replacement for TL431
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 0.15Ω. 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
CL2431VS
CL2431AVS
CL2431IVS
CL2431IAVS
SOT-23
SOT-23
SOT-23
SOT-23
Tolerance
Temperature Range
1.0%
0.5%
1.0%
0.5%
0 to +105oC
0 to +105oC
-40 to +85oC
-40 to +85oC
PIN CONFIGURATION (Top View)
SOT-23 (VS)
CATHODE
ANODE
REFERENCE
1J-22
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CL2431
CORPORATION
ABSOLUTE MAXIMUM RATINGS
SYMBOL
PARAMETER
RATING
UNITS
VKA
Cathode-Anode Reverse Breakdown
18
V
IAK
Anode-Cathode Forward Current
1
A
IKA
Operating Cathode Current
100
mA
IREF
Reference Input Current
1
mA
PD
Continuous Power Dissipation at 25 oC
SOT-23
200
mW
TJ
Junction Temperature
150
o
C
TSTG
Storage Temperature
–65 to 150
o
C
TL
Lead Temperature, Soldering 10 Seconds
300
o
C
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
TYPICAL THERMAL RESISTANCES
PARAMETER
RATING
UNIT
VKA
Cathode Voltage
VREF to 18
V
IK
Cathode Current
10
mA
PACKAGE
SOT-23
θJA
θJC
TYPICAL DERATING
575oC/W
150 oC/W
1.7mW/oC
FUNCTIONAL BLOCK DIAGRAM
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
CL2431
CORPORATION
ELECTRICAL CHARACTERISTICS
Electrical characteristics are guaranteed over full junction temperature range (0 to 105 oC). 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
VREF
TC
PARAMETER
Reference Voltage
MIN
TYP
MAX
UNIT
CIRCUIT
2.490
2.500
2.515
V
1
TA = 25oC, 0.5% CL2431A
2.470
2.500
2.520
V
1
TA = 25 oC, 1.0% CL2431
0.6
0.2
mV/ oC
1
mV/V
2
∆VREF with Temp.*
∆VREF
∆VK
Ratio of Change in VREF to
Cathode Voltage
–2.7
–1.01
–2
–0.4
TEST CONDITION
VREF to 10V
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 I K 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
Ω
1
f ≤ 1kHz, IK = 1 to 100mA
%
0
mV
ppm
*CALCULATING AVERAGE TEMPERATURE COEFFICIENT (TC)
0
∆V REF
∆T
2000
0.2
• TC in mV/oC =
0
–5
• TC in %/oC =
∆VREF (mV)
∆TA
∆VREF



o 
 VREF at 25 C 
x 100
∆TA
–10
0
15
30
45
60
75
90 105
TEMPERATURE (˚C)
o
• TC in ppm/ C =
0.019 mV/˚C
∆VREF



o 
 VREF at 25 C 
x 106
∆TA
0.001 %/˚C
7.6 ppm/˚C
1J-28
TEST CIRCUITS
V IN
V KA = V REF
V IN
V KA
IK
IK
I REF
R1
V IN
V KA
I K(OFF)
I REF
(V REF )
R2
1G-38
1G-39
TEST CIRCUIT 1
TEST CIRCUIT 2
1G-40
TEST CIRCUIT 3
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CL2431
CORPORATION
TYPICAL PERFORMANCE CURVES
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
10
1
0.1
75
50
25
0
–25
–50
–75
–1
0
1
2
VKA – CATHODE VOLTAGE (V)
3
1G-42
VKA = VREF
2.52 I K = 10mA
2.51
2.50
VREF = 2.500V AT 25˚C
2.49
2.48
2.47
2.46
2.45
0
30
60
90 120
–60 –30
TA – AMBIENT TEMPERATURE (˚C)
1P-43
REFERENCE
INPUT CURRENT
2.0
1.5
1.0
0.5
–10
–55˚C
0˚C
–20
25˚C
75˚C
–30
125˚C
–40
I K = 10mA
–50
TEMPERATURE RANGE: –55 to 125˚C
0
1G-45
1J-29
REFERENCE VOLTAGE
LINE REGULATION
0
R1 = 10kΩ
R2 = ∞
2.5 I K = 10mA
0
0
30
60
90 120
–60 –30
TA – AMBIENT TEMPERATURE (˚C)
100
2.53
VKA = 18V
VREF = 0V
3.0
VKA = VREF
TEMPERATURE RANGE: –55 to 125˚C
TEMPERATURE COEFFICIENT AS
A FUNCTION OF TRIM VALUE
OFF STATE LEAKAGE
0.01
0
30
60
90 120
–60 –30
TA – AMBIENT TEMPERATURE (˚C)
125
HIGH CURRENT OPERATING
CHARACTERISTICS
–100
–2
VREF – REFERENCE VOLTAGE (V)
I Z off – OFF STATE CATHODE
CURRENT (nA)
100
I REF – REFERENCE INPUT
CURRENT (µA)
150
VKA = VREF
I K – CATHODE CURRENT (mA)
800
VREF – CHANGE IN REFERENCE
VOLTAGE (mV)
I K – CATHODE CURRENT (µA)
900
LOW CURRENT OPERATING
CHARACTERISTICS
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
CL2431
CORPORATION
TYPICAL PERFORMANCE CURVES (continued)
NOISE VOLTAGE
0.150
Z KA – DYNAMIC IMPEDANCE (Ω)
NOISE VOLTAGE nV/ Hz
70
60
50
40
30
20
VKA = VREF
10 I K = 10mA
TA = 25˚C
0
100
1k
10k
10
f – FREQUENCY (Hz)
Z KA – DYNAMIC IMPEDANCE (Ω)
0.125
VKA = VREF
I KA = 1 TO 100mA
f ≤ 1kHz
0.100
0.075
0.050
0.025
0.0
–60
100k
1G-47
100
LOW FREQUENCY DYNAMIC
OUTPUT IMPEDANCE
–30
0
30
60
90 120
TA – FREE AIR TEMPERATURE
1G-48
DYNAMIC OUTPUT
IMPEDANCE
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
A V – SMALL SIGNAL VOLTAGE
GAIN (dB)
70
TEMPERATURE RANGE: –55 to 125˚C
OUT
60
15k
50
9µF
IK
230Ω
I K = 10mA
40
30
8.25k
GND
20
1H-01
10
0
1k
10k
100k
1M
f – FREQUENCY (Hz)
10M
1J-31
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
CL2431
CORPORATION
INPUT AND OUTPUT VOLTAGES (V)
TYPICAL PERFORMANCE CURVES (continued)
6
PULSE RESPONSE
INPUT
INPUT
MONITOR
5
220Ω
OUT
4
3
OUTPUT
50Ω
f P = 100kHz
2
1
GND
0
1H-03
–1
0 1 2 3 4 5 6 7 8 9 10 11 12
t – TIME (µs)
1H-02
I K – CATHODE CURRENT (mA)
100
90
80
STABILITY BOUNDARY
CONDITIONS
A: VKA = VREF
150 Ω
B: VKA = 5V AT I K = 10mA
C: VKA = 10V AT I K = 10mA
D: VKA = 15V AT I K = 10mA
IK
70
60
50
STABILITY
REGION
C
40
10k
30
A
20
10
CL
B
TA = 25˚C
1H-05
D
0
100 101 102 103 104 105 106 107
C L – LOAD CAPACITANCE (pF)
1H-04
CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025
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