Document
MCC TM
Micro Commercial Components
omponents 20736 Marilla Street Chatsworth !"# $
% !"#
TL431K
Features
• Lead Free Finish/RoHS Compliant ("P" Suffix designates RoHS Compliant. See ordering information)
• Epoxy meets UL 94 V-0 flammability rating
• Moisure Sensitivity Level 1 • Programmable Output Voltage 36V • Sink Current Capability of 0.1mA to 100 mA • The typical value of the equivalent temperature factor in the whole
temperature scope is 50 ppm/oC • Low output noise voltage and Fast turn on response • The Reference Input Voltage tolerance is 0.5% • Marking Code: 431K • Halogen free available upon request by adding suffix "-HF"
Maximum Ratings
Parameter
Symbol
Value
Unit
Cathode Voltage Cathode Current Range Reference Input Current Range Power Dissipation at 25к
Operating Temperature Storage Temperature Range
VKA
37
V
IK
-100~150
mA
IREF
0.05~10
mA
PD
0.3
W
Topr
-40---85
к
TSTG
-65---+150
к
Programmable Precision Regulator
SOT-23
A
D
1
2
3
CB
F
E
G
1. (A) ANODE
2. (R) REFERENCE 3. (K) CATHODE
H
J
Recommended Operating Conditions
Parameter
Sym
Min
Max
Unit
Cathode Voltage
VKA
VREF
36
V
Cathode Current Range
IK
1.0
100
mA
Electrical Characteristics @ 25°C Unless Otherwise Specified
Parameter
Sym
Min
Typ
Max
Test conditions
Reference Input Voltage
Vref
2.482V 2.500V 2.508V VKA=VREF, IKA=10mA
Deviation of reference input voltage
Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage
ϦVref / ϦT
ϦVref/ ϦVKA
4.5mV -1.0
17mV -2.7
VKA=VREF, IKA=10mA
TminЉTaЉTmax ϦVKA=10VДVref
-0.5
-2.0 ϦʳVKA=36VД10V
Reference Input Current
Deviation of Reference Input Current Over Full Temperature Range
Iref
ϦIref/ ϦT
1.5µA 0.4µA
4.0µA 1.2µA
IKA=10mA, R1=10KӨʿ R2=Ќ
IKA=10mA, R1=10KӨʿ R2=Ќʳ TA=full Temperature
Minimum Cathode Current for Regulation
IKA(min)
0. 45mA 1.0mA
Off-State Cathode Current
IKA(off)
0.05µA 0.5µA VKA=40V, VREF=0V
Dynamic Impedance
ZKA
0.15 Ө
0.5 Ө
IKA=1 to 100mA, fЉ1.0KHz
K
DIMENSIONS
INCHES
MM
DIM
MIN
MAX
MIN
MAX
A
.110
.120
2.80
3.04
B
.083
.104
2.10
2.64
C
.047
.055
1.20
1.40
D
.035
.041
.89
1.03
E
.070
.081
1.78
2.05
F
.018
.024
.45
.60
G
.0005
.0039
.013
.100
H
.035
.044
.89
1.12
J
.003
.007
.085
.180
K
.015
.020
.37
.51
Suggested Solder
Pad Layout
.031 .800
NOTE
.035 .900
.079 2.000
inches mm
.037 .950
.037 .950
Revision: B
www.mccsemi.com
1 of 6
2013/01/01
TL431K
Figure 1. Test Circuit for VKA = Vref
Input
IK VKA
Vref
MCC TM
Micro Commercial Components
Figure 2. Test Circuit for VKA > Vref
Figure 3. Test Circuit for Ioff
Input
VKA
Input
IK R1 Iref
R2 Vref
ǒ Ǔ + ) ) VKA
Vref 1
R1 R2
Iref S R1
VKA Ioff
APPICATION INFORMATION
1. Shunt Regulator
Note A : R Should provide cathode current 1mA to the TL431 at minimum VI(BATT)
2. Output Control of a Three-Terminal Fixed Regulator
Revision: B
www.mccsemi.com
2 of 6
2013/01/01
TL431K
3. High-Current Shunt Regulator
MCC TM
Micro Commercial Components
4. Efficient 5-V Precision Regulator
NOTE A : RB Should provide cathode current≥1mA to the TL431.
5. Precision Current Limiter
6. Precision Constant-Current Sink
Revision: B
www.mccsemi.com
3 of 6
2013/01/01
TL431K
150
Cathode Current versus Cathode Voltage
IK, CATHODE CURRENT (mA)
100
50
0
-50
-100 -2
V =V KA ref
T =25℃ a
-1
0
1
2
3
V , CATHODE VOLTAGE (V) KA
Cathode Current versus Cathode Voltage
800
(μA)
I , CATHODE CURRENT
K
600
400
I
KA(min)
200
0
-200 -1
0
1
2
VKA, CATHODE VOLTAGE (V)
VKA=Vref T =25℃
a
3
V , REFERENCE INPUT VOLTAGE (mV) ref
Reference Input Voltage versus
Ambient Temperature
2600
2550
2500
2450
2400
2350 -40
VKA=Vref IK=10mA
-20
0
20
40
60
80
100
T , AMBIENT TEMPERATURE (℃) a
MCC TM
Micro Commercial Components
KA KA ref
Test Circuit for VKA=Vref
Revision: B
www.mccsemi.com
4 of 6
2013/01/01
TL431K
△V , REFERENCE INPUT VOLTAGE (mV) ref
Change in Reference Input Voltage versus Cathode Voltage
0
I =10mA
K
T =25℃ a
-4
-8
-12
-16
-20 0
5
10
15
20
25
30
35
40
V , CATHODE VOLTAGE (V) KA
Reference Input Current versus
Ambient Temperature
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-40
-20
0
20
40
60
T , AMBIENT TEMPERATURE (℃) a
I =10mA
K
R =10KΩ 1
80
100
(μA)
I , REFERENCE INPUT CURRENT
ref
MCC TM
Micro Commercial Components
Test Circuit for VKA=Vref(1+R1/R2)+R1*Iref
Test Circuit for Iref
Off-State Cathode Current
versus Ambient Temperature
40
I , OFF-STATE CATHODE CURRENT (nA)
off
30
20
10
V =36V KA
V =0V ref
0
-40
-20
0
20
40
60
80
100
T , AMBIENT TEMPERATURE (℃) a
Test Circuit for Ioff
www.mccsemi.com
Revision: B
5 of 6
2013/01/01
MCC TM
Micro Commercial Components
Ordering Information :
Device Part Number-TP
Note : Adding "-HF" suffix for halogen free, eg. Part Number-.