UNISONIC TECHNOLOGIES CO., LTD
TL431
PROGRAMMABLE PRECISION
REFERENCE
.
1
LINEAR INTEGRATED CIRCUIT
1
DESCRIPTION
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 36 V with two external resistors. It
provides very wide applications, including shunt regulator, series
regulator, switching regulator, voltage reference and others.
SOT-89
TO-92
SOP-8
3
3
1
2
1
5
4
2
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.
SOT-23
SOT-25
*Pb-free plating product number: TL431K
*Pb-free plating product for SOT-23NS type
number: TL431NSL
ORDERING INFORMATION
Order Number
Pin Assignment
Package
Normal
Lead Free Plating
1 2 3 4 5 6 7 8
TL431-AB3-R
TL431K-AB3-R
R A K - - - - -
SOT-89
TL431-AE3-R
TL431K-AE3-R
K R A - - - - -
SOT-23
TL431NS-AE3-R
TL431NSL-AE3-R
R K A - - - - -
SOT-23
TL431-AF5-R
TL431K-AF5-R
X X K R A - - -
SOT-25
TL431-S08-R
TL431K-S08-R
K A A X X A A R
SOP-8
TL431-S08-T
TL431K-S08-T
K A A X X A A R
SOP-8
TL431-T92-B
TL431K-T92-B
R A K - - - - -
TO-92
TL431-T92-K
TL431K-T92-K
R A K - - - - -
TO-92
TL431-T92-R
TL431K-T92-R
R A K - - - - -
TO-92
Note: Pin Code: K: Cathode A: Anode R: Reference X: No Connection
TL431K-AB3-R
(1)Packing Type
(2)Package Type
(3)Lead Plating
Packing
Tape Reel
Tape Reel
Tape Reel
Tape Reel
Tape Reel
Tube
Tape Box
Bulk
Tape Reel
(1) B: Tape Box, K: Bulk, R: Tape Reel, T: Tube
(2) AB3: SOT-89, AE3: SOT-23, AF5: SOT-25,
S 08:SOP-8, T92: TO-92
(3) K: Lead Free Plating, Blank: Pb/Sn
L : Lead Free Plating Only for SOT-23NS Type
,
MARKING (SOT-23/SOT-25)
431
431N
Lead Plating
Lead Plating
For TL431
For TL431NS
www.unisonic.com.tw
Copyright © 2005 Unisonic Technologies Co., Ltd
1 of 6
QW-R103-003,R
TL431
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
CATHODE
REFERENCE
CATHODE (K)
REFERENCE (R)
2.5V V
REF
ANODE(A)
ANODE
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 6
QW-R103-003,R
TL431
PARAMETER
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
(Operating temperature range applies unless otherwise specified)
RATINGS
UNIT
Cathode Voltage
37
V
Cathode Current Range(Continuous)
-100 ~ +150
mA
Reference Input Current Range
-0.05 ~ +10
mA
TO-92
770
mW
Power Dissipation
P
D
SOT-89
800
mW
SOT-23/SOT-25
300
mW
Operating Junction Temperature
T
J
+150
°C
Operating Ambient 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.
SYMBOL
V
KA
I
KA
I
REF
RECOMMENDED OPERATING CONDITIONS
PARAMETER
Cathode Voltage
Cathode Current
SYMBOL
V
KA
I
KA
MIN
V
REF
1
TYP
MAX
36
100
UNIT
V
mA
ELECTRICAL CHARACTERISTICS
(T
C
= 25℃, unless otherwise specified.)
PARAMETER
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
SYMBOL
TEST CONDITIONS
V
REF
V
KA
=V
REF
,I
KA
=10mA
V
KA
=V
REF
,I
KA
=10mA
∆V
REF
/∆T
0°C≦Ta≦70°C
∆V
KA
=10V~V
REF
∆V
REF
/∆V
KA
I
KA
=10mA
∆V
KA
=36V~10V
I
REF
I
KA
=10mA, R1=10kΩ, R2=∞
I
KA
=10mA, R1=10kΩ, R2=∞
∆I
REF
/∆T
Ta =full Temperature
I
KA(MIN)
V
KA
=V
REF
I
KA(OFF)
V
KA
=36V, V
REF
=0
V
KA
=V
REF
, I
KA
=1 to 100mA
Z
KA
f≤1.0kHz
MIN TYP MAX UNIT
2.470 2.495 2.520
V
4.5
-1.0
-0.5
1.5
0.4
0.45
0.05
0.15
17
-2.7
-2.0
4
1.2
1.0
1.0
0.5
mV
mV/V
µA
µA
mA
µA
Ω
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 6
QW-R103-003,R
TL431
■
TYPICAL CHARACTERISTICS
Cathode Current vs . Cathode Voltage
LINEAR INTEGRATED CIRCUIT
Cathode Current vs . Cathode Voltage
800
125
Cathode Current (mA)
100
75
50
25
0
-25
-50
-75
-100
-2
Cathode Current (mA)
Ta=25°C
V
KA
=V
REF
600
Ta=25°C
V
KA
=V
REF
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
Change in Reference Input Voltage vs .
Cathode Voltage
7
Pulse Response
Ta=25°C
Change In Reference Input Voltage (mV)
-5
Input and Output Voltage (V)
40
-10
-15
-20
-25
-30
-35
-40
0
5
10
15
20
25
I
KA
=100mA
Ta=25°C
6
5
4
3
2
1
0
30
35
0
1
2
3
4
5
6
7
Cathode Voltage (V)
Time (
μ
s)
Dynamic Impedance vs . Frequency
10
2
Small Signal Voltage Amplification vs . Frequency
70
Ta=25°C
I
KA
=0mA to 100mA
10
1
60
Ta=25°C
I
KA
=10mA
Voltage Amplification (dB)
3
4
5
6
7
50
40
30
20
10
0
Impedance (
Ω)
10
0
10
-1
10
10
10
10
10
-10
3
10
10
4
10
5
10
6
10
7
Frequency (Hz)
Frequency (Hz)
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4 of 6
QW-R103-003,R
TL431
TYPICAL CHARACTERISTICS (Cont.)
2.52
2.51
LINEAR INTEGRATED CIRCUIT
Reference Voltage
2.5
2.49
2.48
2.47
2.46
2.45
0°
C
-4
-2
80
°
1μ
20
°
40
°
60
°
Temperature
140
120
A V
KA
=Vref
B V
KA
=5.0V@I
K
=10mA
C V
KA
=10V@I
K
=10mA
D V
KA
=15V@I
K
=10mA
Ta=25℃
A
B
Cathode Current, I
K
(mA)
100
80
60
C
unstable
stable
stable
D
40
20
0
100p
1n
10n
100n
10
10μ
Load Capacitance, C
L
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
0°
C
0°
C
0°
C
C
C
C
C
5 of 6
QW-R103-003,R
京公网安备 11010802033920号
EEWORLD
