Page 1
ET
Adjustable Precision Shunt Regulator
Description Features
The ET TL431 is a three-terminal
adjustable regulator series with a
guaranteed thermal stability over
applicable temperature ranges. The
output voltage may be set to any
value between Vref and 36 volts with
two external resistors. These device
have a typical dynamic output
impedance of 0.27Ω, Active output
circuitry provides a very sharp
turn-on characteristic, making these
devices excellent replacement for
zener diodes in many applications.
¾ Programmable Output Voltage to 36V.
¾ Low Dynamic Output Impedance :
ET TL431xxC/I: 0.27Ω (Typical).
ET TL431xxQ: 0.15Ω (Typical)
¾ Sink Current Capability of 0.1mA to
100mA.
¾ Equivalent Full-Range Temperature
Coefficient of 50 ppm/
¾ Temperature Compensated for
Operation over Full Rated Operating
Temperature Range.
¾ Low Output Noise Voltage.
¾ Fast Turn on Responds.
¾ SOT-23, TO-92, SOT-89, SOP-8
packages
- TL431
o
C
Symbol Applications
Pin Description
¾ Precision Voltage Reference
¾ Linear Regulator
¾ Adjustable Power Supply
¾ Switching Power Supply
¾ Graphic Card
¾ Adapter
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ET
- TL431
Ordering Information
Number
Accurate
Temperature
Package
Pin Assignment Part
R A C
Packing
TL431AAC SOT-23 1 3 2 Tape & Reel
TL431AEC TO-92 1 2 3 Tape & Box
o
0
C~+70oC
TL431ADC SOT-89 1 2 3 Tape & Reel
TL431AKC
SOP-8 8 2,3,6,7 1 Tape & Reel
TL431AAI SOT-23 1 3 2 Tape & Reel
TL431AEI TO-92 1 2 3 Tape & Box
0.5%
o
-40
C ~+125oC
TL431ADI SOT-89 1 2 3 Tape & Reel
TL431AKI
SOP-8 8 2,3,6,7 1 Tape & Reel
TL431AAQ SOT-23 1 3 2 Tape & Reel
TL431AEQ TO-92 1 2 3 Tape & Box
o
C ~+125oC
-60
TL431ADQ SOT-89 1 2 3 Tape & Reel
TL431AKQ
SOP-8 8 2,3,6,7 1 Tape & Reel
TL431BAC SOT-23 1 3 2 Tape & Reel
TL431BEC TO-92 1 2 3 Tape & Box
0oC~+70oC
TL431BDC SOT-89 1 2 3 Tape & Reel
TL431BKC
SOP-8 8 2,3,6,7 1 Tape & Reel
TL431BAI SOT-23 1 3 2 Tape & Reel
TL431BEI TO-92 1 2 3 Tape & Box
1%
-40oC ~+125oC
TL431BDI SOT-89 1 2 3 Tape & Reel
TL431BKI
SOP-8 8 2,3,6,7 1 Tape & Reel
TL431BAQ SOT-23 1 3 2 Tape & Reel
TL431BEQ TO-92 1 2 3 Tape & Box
-60oC ~+125oC
TL431BDQ SOT-89 1 2 3 Tape & Reel
TL431BKQ
SOP-8 8 2,3,6,7 1 Tape & Reel
Absolute Maximum Ratings
Symbol Parameter Value Unit
V
I
KA
I
K
REF
Cathode Voltage
Cathode Current Range(Continuous) -100~150 mA
Reference Input Current Range 0.05~10 mA
ET TL431xxC/I 40
ET TL431xxQ 42
V
ET TL431xxC 0~+70
T
oper.
Operating Temperature Range
ET TL431xxI -40~+125
o
C
ET TL431xxQ -60~+125
T
J
T
stg
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Junction Temperature Range 150
Storage Temperature Range -65~+150
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Version 0.5 8th Dec. 2011
o
C
o
C
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ET
- TL431
Thermal Characteristics
Symbol Parameter Package Typical Value Unit
SOT-23 416
TO-92 250
SOT-89 250
SOP-8 210
o
C/W
θ
Thermal Resistance From Junction to
Ambient in Free Air. (Measured with the
JA
component mounted on a high effective
thermal conductivity test board in free air.)
Recommended Operating Conditions
Symbol Characteristic Min. Typ. Max. Unit
V
KA
I
K
Cathode Voltage
Cathode Current
TL431xxC/I V
TL431xxQ V
TL431xxC/Q 0.5 - 100
TL431xxI 1 - 100
REF
REF
Electrical Characteristics
(Ta=25 °C, VKA=V
, IK=10mA unless otherwise noted .)
REF
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
REF
Reference
input Voltage
VKA=V
=10mA
I
K
REF
0.5% 2.483 2.495 2.508
,
1% 2.470 2.495 2.520
Deviation of
V
REF(dev)
Reference Input
Voltage Over Full
T
min≦Ta≦Tmax
Temperature Range
△V
/△V
REF
KA
Ratio of change in
Reference input Voltage to
the Change in Cathode
△VKA=10V-V
REF
△VKA=36V-10V
Voltage
I
REF
Reference Input Current R1=10KΩ, R2=∞ - 1.8 4 uA
Deviation of Reference
I
REF(dev)
Input Current Over Full
R
=10KΩ, R2=∞ - 0.4 1.2 uA
1
Temperature Range
I
K(min)
I
K(off)
Z
KA
Minimum Cathode
Current for Regulation
Off-State Cathode Current
Dynamic
Impedance
TL431xxC/I
TL431xxQ
- 0.25 0.5 mA
VKA=40V, V
=0 - 0.17 0.9 uA
REF
IK=1mA to 100mA
f≦1.0KHz
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3
- 36
V
40
mA
V
- 3 17 mV
-0.4 - 2.7
mV/
-0.4 - 2.0
- 0.27 0.5
Version 0.5 8th Dec. 2011
0.15 0.5
V
Ω
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ET
- TL431
Test Circuit
Typical Application Circuits
Notes for Typical Application Circuits:
1. For the series regulator applications, add a compensation capacitor C
CATHODE and REF is strongly recommended to improve the stability of output
voltage.
2. Set Vo according to the following equation: Vo=V
3. Choose the Value for R
(1). The maximum limit for RB should be such that the cathode current (I
B
as below:
B
B
than the minimum operating current (0.5mA) at V
(2). The minimum limit for RB should be such that the cathode current (I
B
exceed 100mA under all load conditions, and the instantaneous turn-on value for
does not exceed 120mA.
I
K
(1+R1/R2)+I
REF
.
IN(MIN)
REFxR1
between
1
.
) is greater
K
) does not
K
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ET
- TL431
Typical Characteristics
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ET
- TL431
Typical Characteristics (Continued)
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ET
- TL431
Typical Characteristics (Continued)
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ET
- TL431
Package Information
SOT-23
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ET
- TL431
Package Information
TO-92
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ET
- TL431
Package Information
SOT-89
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ET
- TL431
Package Information
SOP-8
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