The TL431, A, B integrated circuits are three–terminal programmable
shunt regulator diodes. These monolithic IC voltage references operate as a
low temperature coefficient zener which is programmable from V
with two external resistors. These devices exhibit a wide operating current
range of 1.0 mA to 100 mA with a typical dynamic impedance of 0.22 Ω. The
characteristics of these references make them excellent replacements for
zener diodes in many applications such as digital voltmeters, power
supplies, and op amp circuitry. The 2.5 V reference makes it convenient to
obtain a stable reference from 5.0 V logic supplies, and since the TL431, A,
B operates as a shunt regulator, it can be used as either a positive or
negative voltage reference.
• Programmable Output Voltage to 36 V
• Voltage Reference Tolerance: ±0.4%, Typ @ 25°C (TL431B)
• Low Dynamic Output Impedance, 0.22 Ω Typical
• Sink Current Capability of 1.0 mA to 100 mA
• Equivalent Full–Range Temperature Coefficient of 50 ppm/°C Typical
• Temperature Compensated for Operation over Full Rated Operating
SOP–8 is an internally modified SO–8 package. Pins 2,
3, 6 and 7 are electrically common to the die attach flag.
This internal lead frame modification decreases power
dissipation capability when appropriately mounted on a
printed circuit board. SOP–8 conforms to all external
dimensions of the standard SO–8 package.
PLASTIC PACKAGE
CASE 846A
(Micro–8)
1
2
3
4
(Top View)
1
2
3
4
8
7
6
5
8
8
7
6
5
(Top View)
Reference
N/C
Anode
N/C
1
Reference
N/C
MOTOROLA ANALOG IC DEVICE DATA
Motorola, Inc. 1998Rev 6
1
TL431, A, B Series
Symbol
Cathode
(K)
Reference
(R)
Anode
(A)
Reference
(R)
Representative Block Diagram
Reference
(R)
2.5 V
+
–
ref
Anode (A)
Cathode
(K)
2.4 k7.2 k
This device contains 12 active transistors.
MAXIMUM RATINGS (Full operating ambient temperature range applies, unless
otherwise noted.)
Rating
Cathode to Anode VoltageV
Cathode Current Range, ContinuousI
Reference Input Current Range, ContinuousI
Operating Junction TemperatureT
Operating Ambient Temperature RangeT
TL431I, TL431AI, TL431BI–40 to +85
TL431C, TL431AC, TL431BC0 to +70
Storage Temperature RangeT
Total Power Dissipation @ TA = 25°CP
Derate above 25°C Ambient Temperature
D, LP Suffix Plastic Package0.70
P Suffix Plastic Package1.10
DM Suffix Plastic Package0.52
Total Power Dissipation @ TC = 25°CP
Derate above 25°C Case Temperature
D, LP Suffix Plastic Package1.5
P Suffix Plastic Package3.0
2.The deviation parameter ∆V
temperature range that applies.
is defined as the difference between the maximum and minimum values obtained over the full operating ambient
ref
V
mV/V
µA
The average temperature coefficient of the reference input voltage, αV
V
ref
αV
can be positive or negative depending on whether V
ref
3.The dynamic impedance ZKA is defined as
When the device is programmed with two external resistors, R1 and R2, (refer to Figure 2) the total dynamic impedance of the circuit is defined as:
Example :DV
+
8.0 mV and slope is positive,
ref
V
@25_C+2.495 V,DTA+70_
ref
MOTOROLA ANALOG IC DEVICE DATA
V
ref
V
ref
ppm
_
|ZKA|
C
max
min
+
T1
ǒ
V
D
+
Ambient T emperature
ref
D
V
ref
X10
Ǔ
@25_C
ref
D
T
A
Min or V
ref
V
KA
D
I
K
|ZKAȀ|[
ref
C
|ZKA|ǒ1
∆
V
= V
max
ref
ref
–V
min
ref
∆
TA = T2 – T
1
T2
is defined as:
6
Max occurs at the lower ambient temperature. (Refer to Figure 6.)
D
V
R1
R2
D
ref
V
TA(V
0.008 x 10
+
70 (2.495)
Ǔ
+
a
)
ref
ref
6
x10
@25_C)
6
+
45.8 ppmń_
C
3
TL431, A, B Series
ref
D
V
ELECTRICAL CHARACTERISTICS (T
= 25°C, unless otherwise noted.)
A
TL431AITL431ACTL431B
CharacteristicSymbol
Reference Input Voltage (Figure 1)V
VKA = V
, IK = 10 mA
ref
MinTypMaxMinTypMaxMinTypMaxUnit
ref
TA = 25°C2.47 2.495 2.522.472.4952.522.483 2.495 2.507
TA = T
2.The deviation parameter ∆V
temperature range that applies.
is defined as the difference between the maximum and minimum values obtained over the full operating ambient
ref
V
max
ref
V
min
ref
∆
V
= V
ref
–V
min
ref
∆
TA = T2 – T
ref
max
1
V
mV/V
µA
T1
Ambient T emperature
The average temperature coefficient of the reference input voltage, αV
D
V
ref
ǒ
V
ppm
V
ref
_
C
αV
can be positive or negative depending on whether V
ref
3.The dynamic impedance ZKA is defined as
When the device is programmed with two external resistors, R1 and R2, (refer to Figure 2) the total dynamic impedance of the circuit is defined as:
Example :DV
+
8.0 mV and slope is positive,
ref
V
@25_C+2.495 V,DTA+70_
ref
|ZKA|
ref
+
D
V
+
D
|ZKAȀ|[
@25_C
D
Min or V
ref
KA
I
K
Ǔ
T
A
C
|ZKA|ǒ1
4
T2
is defined as:
ref
6
X10
Max occurs at the lower ambient temperature. (Refer to Figure 6.)
ref
D
V
R1
R2
D
ref
V
TA(V
0.008 x 10
+
70 (2.495)
Ǔ
+
a
)
ref
ref
6
x10
@25_C)
6
+
45.8 ppmń_
C
MOTOROLA ANALOG IC DEVICE DATA
TL431, A, B Series
0
5
Figure 1. Test Circuit for VKA = V
Input
V
ref
V
KA
I
K
Figure 4. Cathode Current versus
Cathode Voltage
ref
°
C
KA
I
K
, CATHODE CURRENT (mA)
K
I
150
100
InputV
50
0
–50
VKA = V
TA = 25
ref
Figure 2. Test Circuit for VKA > V
I
K
VKA+
V
KA
R1
ǒ
V
1
)
ref
R2
Input
R1
R2
I
ref
V
ref
Figure 5. Cathode Current versus
800
600
Input
µ
400
200
, CATHODE CURRENT ( A)
0
K
I
ref
Ǔ
)
I
ref
VKA = V
TA = 25
Figure 3. T est Circuit for I
S
R1
Cathode Voltage
ref
°
C
V
KA
I
K
InputV
I
I
off
Min
off
KA
–100
–2.0–1.00
Figure 6. Reference Input V oltage versus
2600
Input
2580
2560
2540
2520
2500
2480
2460
2440
2420
ref
V, REFERENCE INPUT VOLTAGE (mV)
2400
–55
V
ref
TA, AMBIENT TEMPERATURE (
1.02.03.0
VKA, CATHODE VOLTAGE (V)
Ambient Temperature
V
KA
I
VKA = V
K
ref
IK = 10 mA
050
25–25
V
Max = 2550 mV
ref
V
Typ = 2495 mV
ref
V
Min = 2440 mV
ref
75100125
°
C)
–200
µ
, REFERENCE INPUT CURRENT ( A)
ref
I
–1.0
0
1.02.03.
VKA, CATHODE VOLTAGE (V)
Figure 7. Reference Input Current versus
Ambient Temperature
3.0
2.5
2.0
1.5
IK = 10 mA
1.0
0.5
Input
I
ref
10k
0
V
KA
I
K
250–25
TA, AMBIENT TEMPERATURE (°C)
12
1005075–55
MOTOROLA ANALOG IC DEVICE DATA
5
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