TL1431
Adjustable voltage reference
Datasheet
-
production data
Features
Adjustable output voltage: V
REF
to 36 V
Sink current capability: 1 to 100 mA
Typical output impedance: 0.22
Ω
Z
TO-92
(Plastic package)
L
SOT23-3L
0.4% and 0.25% voltage precision
Automotive temp. range - 40 °C to +125 °C
Description
The TL1431 is an adjustable shunt voltage
reference with guaranteed temperature stability
over the entire operating temperature range.
C
SOT323-6L
The output voltage may be set to any value
between 2.5 V and 36 V with two external
resistors.
The TL1431 operates with a wide current range
from 1 to 100 mA with a typical dynamic
impedance of 0.2
Ω
D
L
SOT23-5L
SO-8
(Batwing plastic micropackage)
December 2017
This is information on a product in full production.
DocID5286 Rev 9
1/27
www.st.com
Contents
TL1431
Contents
1
2
3
4
Schematic diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Parameter definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1
4.2
4.3
Reference input voltage deviation overtemperature range . . . . . . . . . . . 12
Temperature coefficient of reference input voltage . . . . . . . . . . . . . . . . . 12
Dynamic impedance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9
5.10
SO-8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
TO-92 Ammopack package information . . . . . . . . . . . . . . . . . . . . . . . . . . 15
TO-92 (bulk) package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
SOT23-3L package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SOT23-5L package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
SOT323-6L package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
SO-8 packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
SOT23-3L packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
SOT23-5L packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
SOT323-6L packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6
7
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
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DocID5286 Rev 9
TL1431
Schematic diagrams
1
Schematic diagrams
Figure 1. TO-92 pin connections (top view)
Figure 2. SO-8 batwing pin connections (top view)
SO8
Cathode 1
Anode 2
3
NC 4
8 Ref
7 Anode
6
5 NC
Figure 3. SOT23-5L and SOT23-3L pin connections (top view)
SOT23-5
NC
NC
Cathode
1
2
3
4 Ref
Ref
2
3 Anode
5 Anode
Cathode 1
SOT23-3
Figure 4. SOT323-6L pin connections (top view)
Figure 5. Block diagram
Cathode
Ref
Vref
Anode
DocID5286 Rev 9
3/27
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Absolute maximum ratings and operating conditions
TL1431
2
Absolute maximum ratings and operating conditions
Table 1. Absolute maximum ratings
Symbol
V
KA
I
k
I
ref
T
j
Parameter
Cathode-to-anode voltage
Continuous cathode current
range
Reference input current range
Junction temperature
Power dissipation
(1)
TO92
P
d
SO-8 batwing
SOT23-3L
SOT23-5L
SOT323-6L
T
stg
ESD
Storage temperature range
HBM: human body model
(2)
MM: machine model
(3)
CDM: charged device model
(4)
625
960
500
790
565
-65 to +150
2000
200
1500
V
°C
mW
Value
37
-100 to +150
-0.05 to +10
+150
Unit
V
mA
mA
°C
1. Calculated with T
j
=+150 °C and T
amb
=+25 °C with relative R
thja
depending on the package.
2. Human body model: A 100 pF capacitor is charged to the specified voltage, then discharged through a
1.5 kΩresistor between two pins of the device. This happens for all couples of connected pin combinations
while the other pins are left floating.
3. Machine model: A 200 pF capacitor is charged to the specified voltage, then discharged directly between
two pins of the device with no external series resistor (internal resistor < 5
Ω).
This happens for all couples
of connected pin combinations while the other pins are left floating.
4. Charged device model: all pins and the package are charged together to the specified voltage and then
discharged directly to the ground through only one pin. This happens for all pins
Table 2. Operating conditions
Symbol
V
KA
I
k
Parameter
Cathode-to-anode voltage
Cathode current
Operating free-air temperature range
T
oper
TL1431C/AC
TL1431I/AI
TL1431IY/AIY
-20 to +70
-40 to +105
-40 to +125
°C
Value
V
ref
to 36
1 to 100
Unit
V
mA
4/27
DocID5286 Rev 9
TL1431
Absolute maximum ratings and operating conditions
Table 3. Thermal data
Symbol
Parameter
Thermal
resistance
junction-case
Thermal
resistance
junction-ambient
TO-92
SO-8
batwing
30
SOT23-3L SOT23-5L SOT323-6L
Unit
R
thJC
57
136
67
110
°C/W
R
thJA
200
85
248
157
221
DocID5286 Rev 9
5/27
27
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