UNISONIC TECHNOLOGIES CO., LTD
TL431L
PROGRAMMABLE PRECISION
REFERENCE
DESCRIPTION
The UTC
TL431L
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 20V with two external resistors. It provides
very wide applications, including shunt regulator, series regulator,
switching regulator, voltage reference and others.
LINEAR INTEGRATED CIRCUIT
FEATURES
*Programmable Output Voltage to 20V.
*Low Dynamic Output Impedance 0.2Ω.
*Sink Current Capability of 1.0 ~ 100mA.
*Equivalent full-Range Temperature Coefficient of 50ppm/
°C
Typical
for Operation over full Rated Operating Temperature Range.
ORDERING INFORMATION
Ordering Number
Pin Assignment
Package
Lead Free
Halogen Free
1 2 3 4 5 6
TL431LK-AB3-R
TL431LG-AB3-R
SOT-89
R A K - - -
TL431LK-AE3-R
TL431LG-AE3-R
SOT-23
K R A - - -
TL431LK-AF5-R
TL431LG-AF5-R
SOT-25
X X K R A -
TL431LK-S08-R
TL431LG-S08-R
SOP-8
K A A X X A
TL431LK-S08-T
TL431LG-S08-T
SOP-8
K A A X X A
TL431LK-SM1-R
TL431LG-SM1-R
MSOP-8
K X X X X A
TL431LK-SM1-T
TL431LG-SM1-T
MSOP-8
K X X X X A
TL431LK-T92-B
TL431LG-T92-B
TO-92
R A K - - -
TL431LK-T92-K
TL431LG-T92-K
TO-92
R A K - - -
TL431LK-T92-R
TL431LG-T92-R
TO-92
R A K - - -
Note: Pin Code: K: Cathode
A: Anode
R: Reference
X: No Connection
7
-
-
-
A
A
X
X
-
-
-
8
-
-
-
R
R
R
R
-
-
-
Packing
Tape Reel
Tape Reel
Tape Reel
Tape Reel
Tube
Tape Reel
Tube
Tape Box
Bulk
Tape Reel
MARKING (SOT-23/SOT-25)
SOT-23
SOT-25
www.unisonic.com.tw
Copyright © 2011 Unisonic Technologies Co., Ltd
1 of 6
QW-R103-014.G
TL431L
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 6
QW-R103-014.G
TL431L
PARAMETER
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
(Operating temperature range applies unless otherwise specified)
SYMBOL
RATINGS
UNIT
Cathode Voltage
V
KA
20
V
Cathode Current Range (Continuous)
I
KA
-100 ~ +150
mA
Reference Input Current
I
REF
-0.05 ~ +10
mA
Junction Temperature
T
J
150
°C
Operating Temperature
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
Cathode Voltage
Cathode Current
SYMBOL
V
KA
I
KA
MIN
V
REF
1
TYP
MAX
20
100
UNIT
V
mA
ELECTRICAL CHARACTERISTICS
(T
A
=25°C, unless otherwise specified)
PARAMETER
SYMBOL
Reference Input Voltage
V
REF
Deviation of Reference Input Voltage
ΔV
REF
/ΔT
Over temperature (note 1)
Ratio of Change in Reference Input
Voltage to the Change in Cathode
ΔV
REF
/ΔV
KA
Voltage
Reference Input Current
I
REF
Deviation of Reference Input Current
ΔI
REF
/ΔT
Over Full Temperature Range
Minimum Cathode Current for Regulation
I
KA(MIN)
Off-State Cathode Current
I
KA(OFF)
TEST CONDITIONS
V
KA
=V
REF
, I
KA
=10mA
V
KA
=V
REF
, I
KA
=10mA
0≤T
A
≤70
I
KA
=10mA
ΔV
KA
=10V~V
REF
ΔV
KA
=20V~10V
MIN
2.450
TYP
2.50
4.5
-1.0
-0.5
1.5
0.4
0.45
0.05
0.15
MAX
2.550
17
-2.7
-2.0
4
1.2
1.0
1.0
0.5
UNIT
V
mV
mV/V
μA
μA
mA
μA
Ω
I
KA
=10mA, R1=10kΩ, R2=∞
I
KA
=10mA, R1=10kΩ, R2=∞
T
A
=full Temperature
V
KA
=V
REF
V
KA
=20V, V
REF
=0
V
KA
=V
REF
, I
KA
=1 ~ 100mA
Dynamic Impedance
Z
KA
f≤1.0kHz
Remark: Reference voltage of
±1%
tolerance is also available per customer’s request.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 6
QW-R103-014.G
TL431L
TEST CIRCUIT
LINEAR INTEGRATED CIRCUIT
APPLICATION CIRCUIT
V
IN
I
OUT
V
OUT
V
IN
I
OUT
R
CL
V
OUT
Rs
Rs
UTC TL431L
I
OUT
=V
REF
/R
S
UTC TL431L
R
S
=V
REF
/R
CL
Constant-Current Sink
Current Limiting or Current Source
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4 of 6
QW-R103-014.G
TL431L
TYPICAL CHARACTERISTICS
Cathode Current vs. Cathode Voltage
125
T
A
=25℃
V
KA
=V
REF
LINEAR INTEGRATED CIRCUIT
800
Cathode Current vs. Cathode Voltage
T
A
=25℃
V
KA
=V
REF
Cathode Current (mA)
100
75
50
25
0
-25
-50
-75
-100
-2
600
Cathode Current (μA)
400
I
KA(min)
200
0
-200
-1
0
1
2
3
-2
-1
0
1
2
3
Cathode Voltage (V)
Cathode Voltage (V)
0
-5
-10
-15
-20
-25
-30
-35
-40
0
Change in Reference Input Voltage vs.
Cathode voltage
7
T
A
=25℃
Pulse Response
Input and Output Voltage (V)
I
KA
=100mA
T
A
=25℃
5
10
15
20
25
30
35
40
Change In Reference INput
Voltage (mV)
6
5
4
3
2
1
0
0
1
2
3
4
5
6
7
Cathode Voltage (V)
Time (μs)
Dynamic Impedance vs. Frequency
10
2
Small Signal Voltage Amplification vs. Frequency
70
T
A
=25℃
I
KA
=0mA ~ 100mA
Impedance (Ω)
10
1
60
50
40
30
20
10
0
T
A
=25℃
I
KA
=10mA
10
4
10
0
10
-1
Voltage Amplification (dB)
3
4
5
6
7
10
10
10
10
10
-10
3
10
10
5
10
6
10
7
Frequency (Hz)
Frequency (Hz)
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 6
QW-R103-014.G
Microcontroller MCU
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