UNISONIC TECHNOLOGIES CO., LTD
TL431
PROGRAMMABLE PRECISION
REFERENCE
DESCRIPTION
LINEAR INTEGRATED CIRCUIT
The UTC
TL431
is a three-terminal adjustable regulator with a
guaranteed thermal stability over applicable temperature ranges.
The output voltage may be set to any value between V
REF
(approximately 2.5V) and 36V with two external resistors. It provides
very wide applications, including shunt regulator, series regulator,
switching regulator, voltage reference and others.
FEATURES
* Programmable output Voltage to 36V.
* Low dynamic output impedance 0.2Ω.
* Sink current capability of 1.0 to 100mA.
* Equivalent full-range temperature coefficient of 50ppm/°C
typical for operation over full rated operating temperature range.
ORDERING INFORMATION
8
-
-
-
-
-
-
-
R
-
-
-
Packing
Tape Reel
Tape Reel
Tape Reel
Tape Reel
Tape Reel
Tape Reel
Tape Reel
Tape Reel
Bulk
Tape Box
Bulk
Ordering Number
Pin Assignment
Package
Lead Free
Halogen Free
1 2 3 4 5 6 7
-
TL431G-AB3-R
SOT-89
R A K -
-
-
-
-
TL431G-AE2-R
SOT-23-3
K R A -
-
-
-
-
TL431G-AE3-R
SOT-23
K R A -
-
-
-
-
TL431NSG-AE3-R
SOT-23
R K A -
-
-
-
-
TL431NSG-AE2-R
SOT-23-3
R K A -
-
-
-
-
TL431G-AF5-R
SOT-25
X X K R A -
-
-
TL431NG-AF5-A-R
SOT-25
X A X K R -
-
-
TL431G-S08-R
SOP-8
K A A X X A A
-
TL431G-G03-K
SIP-3
R A K -
-
-
-
TL431K-T92-B
TL431G-T92-B
TO-92
R A K -
-
-
-
TL431K-T92-K
TL431G-T92-K
TO-92
R A K -
-
-
-
Note: Pin Code: K: Cathode
A: Anode
R: Reference
X: No Connection
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TL431
MARKING
PACKAGE
SOT-23-3
SOT-23
(TL431)
3
SOT-23-3
SOT-23
(TL431NS)
2
5
SOT-25
1
SOT-89
431G
2
3
431NG
1
4
TO-92
SIP-3
MARKING
LINEAR INTEGRATED CIRCUIT
PACKAGE
MARKING
SOP-8
PIN CONFIGURATION(For SOP-8)
BLOCK DIAGRAM
CATHODE
REFERENCE
CATHODE (K)
REFERENCE (R)
2.5V V
REF
ANODE(A)
ANODE
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TL431
PARAMETER
SYMBOL
V
KA
I
KA
I
REF
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
(Operating temperature range applies, unless otherwise specified)
RATINGS
37
-100 ~ +150
-0.05 ~ +10
770
800
UNIT
V
mA
mA
mW
mW
Cathode Voltage
Cathode Current Range(Continuous)
Reference Input Current Range
TO-92
SOT-89
SOT-23/SOT-23-3
Power Dissipation
P
D
300
mW
SOT-25
SIP-3
400
mW
SOP-8
600
mW
Operating Junction
T
J
+150
°C
Operating Ambient
T
OPR
-40 ~ +85
°C
Storage Temperature
T
STG
-65 ~ +150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
V
KA
I
KA
MIN
V
REF
1
TYP
MAX
36
100
UNIT
V
mA
Cathode Voltage
Cathode Current
ELECTRICAL CHARACTERISTICS
(T
C
= 25°C, unless otherwise specified.)
PARAMETER
SYMBOL
V
REF
∆V
REF
∆T
∆V
REF
∆V
KA
Reference Input Voltage
Deviation of reference Input Voltage Over
temperature
Ratio of Change in Reference Input
Voltage to the Change in Cathode Voltage
Reference Input Current
Deviation of Reference Input Current Over
Full Temperature Range
Minimum Cathode Current for Regulation
Off-State Cathode Current
Dynamic Impedance
I
REF
∆I
REF
∆T
I
KA(MIN)
I
KA(OFF)
Z
KA
TEST CONDITIONS
TL431-A
TL431-1
V
KA
=V
REF
,I
KA
=10mA
TL431-2
TL431-3
V
KA
=V
REF
,I
KA
=10mA,
0°C
≤T
A
≤70°C
V
KA
=10V~V
REF
I
KA
=10mA
V
KA
=36V~10V
I
KA
=10mA, R1=10kΩ, R2=∞
I
KA
=10mA, R1=10kΩ, R2=∞,
T
A
=full Temperature
V
KA
=V
REF
V
KA
=36V, V
REF
=0
V
KA
=V
REF
, I
KA
=1~ 100mA,f≤1.0kHz
MIN TYP MAX UNIT
2.483 2.495 2.507 V
2.470 2.495 2.520 V
2.520
-
2.545 V
2.445
-
2.470 V
4.5
-1.0
-0.5
1.5
0.4
0.3
0.05
0.15
17
mV
-2.7 mV/V
-2.0 mV/V
4
µA
1.2
0.5
1.0
0.5
µA
mA
µA
Ω
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TL431
TEST CIRCUIT
INPUT
I
KA
V
KA
LINEAR INTEGRATED CIRCUIT
UTC TL431
V
REF
For V
KA
=V
REF
V
KA
=V
REF
×(1+R
1
/R
2
)+I
REF×
R
1
For V
KA
≥V
REF
For I
KA(OFF)
APPLICATION CIRCUIT
V
OUT
=(1+R
1
/R
2
)×V
REF
Shutdown Regulator
V
OUT
=(1+R
1
/R
2
)×V
REF
Minimum V
OUT
=V
REF
+5V
Output Control of a Three
-Terminal Fixed Regulator
V
OUT
V
OUT
=(1+R
1
/R
2
)×V
REF
Higher-current Shunt Regulator
V
IN
I
OUT
V
IN
I
OUT
R
CL
V
OUT
R
S
R
S
UTC
TL431
I
OUT
=V
REF
/R
S
Constant-current Sink
UTC
TL431
I
OUT
=V
REF
/R
CL
Current Limiting or Current Source
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TL431
■
TYPICAL CHARACTERISTICS
150
Cathode Current (mA)
Cathode Current vs. Cathode Voltage
800
Cathode Current (μA)
600
400
200
0
LINEAR INTEGRATED CIRCUIT
Cathode Current vs. Cathode Voltage
T
A
=25°C
V
KA
=V
REF
T
A
=25°C
125 V =V
KA
REF
100
75
50
25
0
-25
-50
I
KA(MIN
)
-75
-100
-2
-1
0
1
2
Cathode Voltage (V)
3
-200
-2
-1
0
1
2
Cathode Voltage (V)
Pulse Response
3
Change In Reference Input Voltage (mV)
0
-5
-10
-15
-20
-25
-30
-35
-40
0
Input and Output Voltage (V)
40
Change in Reference Input Voltage vs.
Cathode Voltage
I
KA
=10mA
T
A
=25°C
7
6
5
4
3
2
1
0
-1
T
A
=25°C
5
10
15
20
25
30
35
-1
0
1
Cathode Voltage (V)
2
3
4
Time (µs)
5
6
7
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