TS431/431A/431B
Adjustable Precision Shunt Regulator
Sink Current Capability up to 100mA
General Description
The TS431/431A/431B integrated circuits are three-terminal programmable shunt regulator diodes. These monolithic IC
voltage references operate as a low temperature coefficient zener which is programmable from Vref to 36 volts with two
external resistors. These devices exhibit a wide operating current range of 1.0 to 100mA with a typical dynamic
impedance of 0.22Ω. The characteristics of these references make them excellent replacements for zener diodes in many
applications such as digital voltmeters, power supplies, and op amp circuitry. The 2.5volt reference makes it convenient to
obtain a stable reference from 5.0volt logic supplies, and since The TS431/431A/431B operates as a shunt regulator, it
can be used as either a positive or negative stage reference.
This series is offered in 3-pin TO-92, SOT-89, SOT-23 and SOP-8 package.
Features
Precision Reference Voltage
TS431
2.495V±2%
TS431A 2.495V±1%
TS431B 2.495V±0.5%
Equivalent Full Range Temp. Coefficient: 50ppm/ C
Programmable Output Voltage up to 36V
Fast Turn-On Response
Sink Current Capability of 1.0 to 100 mA
Low Dynamic Output Impedance: 0.22Ω
Low Output Noise
o
Standard Application
Ordering Information
Part No.
TS431xCT
TS431xCY
TS431xCX
TS431xCS
Note: Where
x
denotes voltage tolerance.
Blank: ±2%
A: ±1%
B: ±0.5%
-20 ~ +85 C
o
Block Diagram
Operating Temp.
(Ambient)
Package
TO-92
SOT-89
SOT-23
SOP-8
Pin Assignment
Pin No.
TS431/A/BCT
1
2
3
TS431/A/BCY
1
2
3
TS431/A/BCX
1
3
2
TS431/A/BCS
8
2,3,6,7
1
4,5
Pin
Description
Reference
Anode
Cathode
Non connect
TS431/A/B
1-8
2003/12 rev. B
Absolute Maximum Rating
Cathode Voltage (Note 1)
Continuous Cathode Current Range
Reference Input Current Range
Power Dissipation (Note 2, 3)
TO-92
SOT-89 / SOP-8
SOT-23
Operating Junction Temperature Range
Storage Temperature Range
Note 2: Tj Max = 150 C
Note 3: Rating apply to ambient temperature at 25 C
o
o
Vka
Ik
Iref
37
-100 ~ +150
-0.05 ~ +10
0.625
V
mA
mA
Pd
0.5
0.3
W
o
o
Tj
T
STG
+125
-65 ~ +150
C
C
Note 1: Voltage values are with respect to the anode terminal unless otherwise noted.
Recommend Operating Condition
Cathode Voltage Range
Cathode Current Range (for regulation)
Vka
Ik
Ref ~ 36
1 ~ 100
V
mA
Electrical Characteristics
(Ta=25 C, unless otherwise specified.)
Parameter
Reference
voltage
TS431
TS431A
TS431B
Deviation of reference input
voltage, over temp. (Note 4)
Reference Input current
Radio of change in Vref to
change in cathode Voltage
Deviation of reference input
current, over temp.
Minimum operating cathode
current
Off-state Cathode Current
Dynamic Output Impedance
∆Vref
Ta = full range
Vka =Vref, Ik=10mA (Figure 1)
R1=10KΩ, R2=
∞
, Ika=10mA
(Figure 2)
Ika=10mA, Vka = 10V to Vref,
Vka = 36V to 10V (Figure 2)
Ta= full range
Iref(DEV)
R1=10KΩ, R2=
∞
, Ika=10mA
(Figure 2)
Ika(min)
Ioff
|Zka|
Vka=Vref (Figure 1)
Vref=0V (Figure 3)
f<1KHz, Vka=Vref
Ika=1mA to 100mA (Figure 1)
Vka=36V
--
--
--
0.4
--
0.22
0.6
1.0
0.5
mA
uA
Ω
--
0.4
1.2
uA
Vref
Vka =Vref, Ik=10mA (Figure 1)
Symbo
Test Conditions
Min
2.450
2.475
2.487
--
3
2.495
Typ
Max
2.550
2.525
2.513
17
mV
V
Unit
o
Iref
∆Vref
/
∆Vka
--
--
--
0.7
-1.4
- 1.0
4.0
-2.7
- 2.0
uA
mV/V
TS431/A/B
2-8
2003/12 rev. B
Electrical Characteristics (continued)
(Ta=25
o
C, unless otherwise specified.)
Note 4. Deviation of reference input voltage, VDEV, is defined as the maximum deviation of the reference over the full
temperature range.
The average temperature coefficient of the reference input voltage
αVref
is defined as:
|
αVref
| = [ V
DEV
/ Vref(25
o
C
) ] * 10
6
/ T2 – T1
…………………….. (PPM/
o
C)
Where:
T2-T1
= full temperature change.
αVref
can be positive or negative depending on whether the slope is positive or negative.
|
αVref
| = [ 4mV / 2495mV ] * 10
6
/ 70
o
C
≈
23ppm/
o
C
Note 5. The dynamic output impedance, Rz, is defined as:
Example: Maximum Vref=2.496V at 30
o
C, minimum Vref=2.492V at 0
o
C, Vref=2.495V at 25
o
C,
∆T=70
o
C
| Zka | =
∆Vka
/
∆Ika
When the device is programmed with two external resistors R1and R2 (see Figure 2). The dynamic output
impedance of the overall circuit, is defined as :
| Zka | =
∆v
/
∆i
|
≈
Zka | * ( 1 + R1 / R2)
Test Circuits
TS431/A/B
3-8
2003/12 rev. B
Application Examples
TS431/A/B
4-8
2003/12 rev. B
Application Examples
TS431/A/B
5-8
2003/12 rev. B
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