TS1431A Datasheet PDF - Taiwan Semiconductor

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TS1431A
Taiwan Semiconductor

Part Number TS1431A
Description (TS1431A/B) Adjustable Precision Shunt Regulator
Page 7 Pages


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TS1431/1431A/1431B
Adjustable Precision Shunt Regulator
Pin Assignment:
1. Cathode
2. Reference
3. Anode
Sink Current Capability up to 100mA
General Description
The TS1431/1431A/1431B 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 0.22. 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 TS1431/1431A/1431B 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 and SOT-23 package.
Features
Standard Application
— Precision Reference Voltage
TS1431 2.495V±2%
TS1431A 2.495V±1%
TS1431B 2.495V±0.5%
— Equivalent Full Range Temp. Coefficient: 50ppm/ oC
— Programmable Output Voltage up to 36V
— Fast Turn-On Response
— Sink Current Capability of 1.0 to 100 mA
— Low Dynamic Output Impedance: 0.22
— Low Output Noise
Ordering Information
Block Diagram
Part No.
Operating Temp.
(Ambient)
TS1431xCT
TS1431xCX
-20 ~ +85 oC
Note: Where x denotes voltage tolerance.
Blank: ±2%
A: ±1%
B: ±0.5%
Package
TO-92
SOT-23
TS1431/A/B
1-7
2003/12 rev. B
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Absolute Maximum Rating
Cathode Voltage (Note 1)
Vka 37
Continuous Cathode Current Range
Ik -100 ~ +150
Reference Input Current Range
Iref -0.05 ~ +10
Power Dissipation (Note 2, 3)
TO-92
SOT-23
Pd
0.625
0.3
Operating Junction Temperature Range
Tj -25 ~ +125
Storage Temperature Range
TSTG
-65 ~ +150
Note 1: Voltage values are with respect to the anode terminal unless otherwise noted.
Note 2: Tj Max = 125oC
Note 3: Rating apply to ambient temperature at 25 oC
V
mA
mA
W
oC
oC
Recommend Operating Condition
Cathode Voltage Range
Cathode Current Range (for regulation)
Electrical Characteristics
(Ta=25 oC, unless otherwise specified.)
Parameter
Reference
TS1431
voltage
TS1431A
Symbo
Vref
TS1431B
Deviation of reference input
voltage, over temp. (Note 4)
Vref
Reference Input current
Iref
Radio of change in Vref to
change in cathode Voltage
Vref /
Vka
Deviation of reference input
current, over temp.
Iref(DEV)
Minimum operating cathode
current
Off-state Cathode Current
Ika(min)
Ioff
Dynamic Output Impedance
|Zka|
Vka
Ik
Test Conditions
Vka =Vref, Ik=10mA (Figure 1)
Ta = full range
Vka =Vref, Ik=10mA (Figure 1)
R1=10K, R2= , Ika=10mA
(Figure 2)
Ika=10mA, Vka = 10V to Vref,
Vka = 36V to 10V (Figure 2)
Ta= full range
R1=10K, R2= , Ika=10mA
(Figure 2)
Vka=Vref (Figure 1)
Vref=0V (Figure 3) Vka=36V
f<1KHz, Vka=Vref
Ika=1mA to 100mA (Figure 1)
Ref ~ 36
1 ~ 100
V
mA
Min
2.446
2.470
2.483
Typ
2.495
Max
2.545
2.520
2.507
-- 3 17
Unit
V
mV
-- 0.7 4.0 uA
-- -1.4 -2.7
mV/V
-- - 1.0 - 2.0
-- 0.4 1.2 uA
-- 0.4 0.6 mA
-- -- 1.0 uA
-- 0.22 0.5
TS1431/A/B
2-7
2003/12 rev. B
Free Datasheet http://www.datasheet4u.com/



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Electrical Characteristics (continued) (Ta=25 oC, 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 | = [ VDEV / Vref(25 oC) ] * 106 / T2 – T1…………………….. (PPM/ oC)
Where: T2-T1 = full temperature change.
αVref can be positive or negative depending on whether the slope is positive or negative.
Example: Maximum Vref=2.496V at 30oC, minimum Vref=2.492V at 0oC, Vref=2.495V at 25oC, T=70 oC
| αVref | = [ 4mV / 2495mV ] * 106 / 70oC 23ppm/oC
Note 5. The dynamic output impedance, Rz, is defined as:
| 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
TS1431/A/B
3-7
2003/12 rev. B
Free Datasheet http://www.datasheet4u.com/



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Application Examples
TS1431/A/B
4-7
2003/12 rev. B
Free Datasheet http://www.datasheet4u.com/



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