TLV431A, TLV431B
Low Voltage Precision
Adjustable Shunt Regulator
The TLV431A and B series are precision low voltage shunt
regulators that are programmable over a wide voltage range of 1.24 V
to 16 V. The TLV431A series features a guaranteed reference accuracy
of
±1.0%
at 25°C and
±2.0%
over the entire industrial temperature
range of -40°C to 85°C. For TLV431B series, the accuracy is even
higher, it's
±0.5%
and
±1.0%
respectively. These devices exhibit a
sharp low current turn-on characteristic with a low dynamic
impedance of 0.20
W
over an operating current range of 100
mA
to
20 mA. This combination of features makes this series an excellent
replacement for zener diodes in numerous applications circuits that
require a precise reference voltage. When combined with an
optocoupler, the TLV431A/B can be used as an error amplifier for
controlling the feedback loop in isolated low output voltage (3.0 V to
3.3 V) switching power supplies. These devices are available in
economical TO-92-3 and micro size TSOP-5 and
SOT-23-3 packages.
Features
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TO-92
LP SUFFIX
CASE 29
12
1
3
STRAIGHT LEAD
BULK PACK
3
BENT LEAD
TAPE & REEL
AMMO PACK
2
4
5
3
•
Programmable Output Voltage Range of 1.24 V to 16 V
•
Voltage Reference Tolerance
"1.0%
for A Series and
•
•
•
•
•
1
2
TSOP-5
SN SUFFIX
CASE 483
"0.5%
for B Series
Sharp Low Current Turn-On Characteristic
Low Dynamic Output Impedance of 0.20
W
from 100
mA
to 20 mA
Wide Operating Current Range of 50
mA
to 20 mA
Micro Miniature TSOP-5, SOT-23-3 and TO-92-3 Packages
Pb-Free Packages are Available
3
1
2
SOT-23-3
SN1 SUFFIX
CASE 318
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
Applications
•
Low Output Voltage (3.0 V to 3.3 V) Switching Power Supply
•
•
•
•
•
Error Amplifier
Adjustable Voltage or Current Linear and Switching Power Supplies
Voltage Monitoring
Current Source and Sink Circuits
Analog and Digital Circuits Requiring Precision References
Low Voltage Zener Diode Replacements
DEVICE MARKING INFORMATION
AND PIN CONNECTIONS
See general marking information in the device marking
section on page 10 of this data sheet.
Reference (R)
+
-
1.24 V
ref
Cathode (K)
Anode (A)
Figure 1. Representative Block Diagram
©
Semiconductor Components Industries, LLC, 2008
1
January, 2008 - Rev. 10
Publication Order Number:
TLV431A/D
TLV431A, TLV431B
Cathode (K)
Cathode (K)
Reference (R)
Reference (R)
Anode (A)
Device Symbol
Anode (A)
The device contains 13 active transistors.
Figure 2. Representative Device Symbol and Schematic Diagram
MAXIMUM RATINGS
(Full operating ambient temperature range applies, unless otherwise noted)
Rating
Cathode to Anode Voltage
Cathode Current Range, Continuous
Reference Input Current Range, Continuous
Thermal Characteristics
LP Suffix Package, TO-92-3 Package
Thermal Resistance, Junction-to-Ambient
Thermal Resistance, Junction-to-Case
SN Suffix Package, TSOP-5 Package
Thermal Resistance, Junction-to-Ambient
SN1 Suffix Package, SOT-23-3 Package
Thermal Resistance, Junction-to-Ambient
Operating Junction Temperature
Operating Ambient Temperature Range
Storage Temperature Range
Symbol
V
KA
I
K
I
ref
Value
18
-20 to 25
*0.05
to 10
Unit
V
mA
mA
°C/W
R
qJA
R
qJC
R
qJA
R
qJA
T
J
T
A
T
stg
178
83
226
491
150
*40
to 85
*65
to 150
°C
°C
°C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
NOTE: This device series contains ESD protection and exceeds the following tests: Human Body Model 2000 V per MIL-STD-883,
Method 3015. Machine Model Method 200 V.
*
T
J(max)
A
P
+
D
R
qJA
T
RECOMMENDED OPERATING CONDITIONS
Condition
Cathode to Anode Voltage
Cathode Current
Symbol
V
KA
I
K
Min
V
ref
0.1
Max
16
20
Unit
V
mA
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2
TLV431A, TLV431B
ELECTRICAL CHARACTERISTICS
(T
A
= 25°C unless otherwise noted)
TLV431A
Characteristic
Reference Voltage (Figure 3)
(V
KA
= V
ref
, I
K
= 10 mA, T
A
= 25°C)
(T
A
= T
low
to T
high
, Note 1)
Reference Input Voltage Deviation Over Temperature (Figure 3)
(V
KA
= V
ref
, I
K
= 10 mA, T
A
= T
low
to T
high
, Note 1)
Ration of Reference Input Voltage Change to Cathode Voltage
Change (Figure 4)
(V
KA
= V
ref
to 16 V, I
K
= 10 mA)
Reference Terminal Current (Figure 4)
(I
K
= 10 mA, R1 = 10 kW, R2 = open)
Reference Input Current Deviation Over Temperature (Figure 4)
(I
K
= 10 mA, R1 = 10 kW, R2 = open, Notes 1, 2)
Minimum Cathode Current for Regulation (Figure 3)
Off-State Cathode Current (Figure 5)
(V
KA
= 6.0 V, V
ref
= 0)
(V
KA
= 16 V, V
ref
= 0)
Dynamic Impedance (Figure 3)
(V
KA
= V
ref
, I
K
=0.1 mA to 20 mA, f
≤
1.0 kHz, Note 3)
Symbol
V
ref
1.228
1.215
DV
ref
-
1.240
-
7.2
1.252
1.265
20
1.234
1.228
-
1.240
-
7.2
1.246
1.252
mV
20
mV
V
mA
-
DI
ref
I
K(min
)
I
K(off)
-
-
|Z
KA
|
-
0.25
0.4
-
0.25
0.4
0.01
0.012
0.04
0.05
-
-
0.01
0.012
0.04
0.05
W
-
-
0.15
0.04
55
0.3
0.08
80
-
-
-
0.15
0.04
55
0.3
mA
0.08
80
mA
mA
Min
Typ
Max
Min
TLV431B
Typ
Max
Unit
V
DV
ref
DV
KA
I
ref
-
-0.6
-1.5
-
-0.6
-1.5
1. Ambient temperature range: T
low
=
*40°C,
T
high
= 85°C.
2. The deviation parameters
DV
ref
and
DI
ref
are defined as the difference between the maximum value and minimum value obtained over the
full operating ambient temperature range that applied.
V
ref
Max
DV
ref
= V
ref
Max - V
ref
Min
V
ref
Min
T
1
Ambient Temperature
T
2
DT
A
= T
2
- T
1
The average temperature coefficient of the reference input voltage,
aV
ref
is defined as:
(DV )
ref
V
(T
+
25°C)
ref A
DT
A
10
6
αV
ref
ppm
+
°C
aV
ref
can be positive or negative depending on whether V
ref
Min or V
ref
Max occurs at the lower ambient temperature, refer to Figure 8.
Example:
DV
ref
= 7.2 mV and the slope is positive,
Example:
V
ref
@ 25°C = 1.241 V
Example:
DT
A
= 125°C
0.0072
ppm
+
1.241
αV
ref
°C
125
3. The dynamic impedance Z
KA
is defined as:
⏐Z
DV
KA
⏐
+
KA
DI
K
10
6
+
46 ppm
°C
When the device is operating with two external resistors, R1 and R2, (refer to Figure 4) the total dynamic impedance of the circuit is given by:
⏐Z
KA
′⏐
+
⏐Z
KA
⏐
1
)
R1
R2
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3
TLV431A, TLV431B
Input
I
K
R1
I
ref
V
KA
Input
I
K
V
KA
Input
I
K(off)
V
KA
V
ref
R2
V
ref
V
KA
+
V
ref
1
)
R1
)
I
S
R1
ref
R2
Figure 3. Test Circuit
for V
KA
= V
ref
Figure 4. Test Circuit
for V
KA
u
V
ref
Figure 5. Test Circuit
for I
K(off)
30
110
90
Input
I
K
V
KA
I K , CATHODE CURRENT (mA)
20
Input
I
K
V
KA
I K , CATHODE CURRENT (
m
A)
70
50
30
10
V
KA
= V
ref
T
A
= 25°C
I
K(min)
10
V
KA
= V
ref
T
A
= 25°C
0
-10
-10
-1.0
-30
-0.5
0
0.5
1.0
V
KA
, CATHODE VOLTAGE (V)
1.5
2.0
0
0.2
0.4
0.6
0.8
1.0
V
KA
, CATHODE VOLTAGE (V)
1.2
1.4
Figure 6. Cathode Current vs. Cathode Voltage
Figure 7. Cathode Current vs. Cathode Voltage
1.25
I ref , REFERENCE INPUT CURRENT (
m
A)
Vref , REFERENCE INPUT VOLTAGE (V)
Vref
(max)
0.15
Input
I
K
10 k
I
ref
V
KA
1.24
Vref
(typ)
0.14
I
K
= 10 mA
1.23
Input
V
KA
= V
ref
I
K
= 10 mA
VKA
IK
Vref
(min)
TLV431A Typ.
85
0.13
1.22
-40
-15
10
35
60
T
A
, AMBIENT TEMPERATURE (°C)
0.12
-40
-15
10
35
60
T
A
, AMBIENT TEMPERATURE (°C)
85
Figure 8. Reference Input Voltage versus
Ambient Temperature
Figure 9. Reference Input Current versus
Ambient Temperature
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4
TLV431A, TLV431B
D
Vref , REFERENCE INPUT VOLTAGE CHANGE (mV)
0
I K(off) , CATHODE CURRENT (
m
A)
I
K
= 10 mA
T
A
= 25°C
4.0
Input
V
KA
I
off
-2.0
3.0
V
KA
= 16 V
V
ref
= 0 V
-4.0
Input
V
KA
I
K
R1
2.0
-6.0
V
ref
-8.0
-10
0
R2
1.0
T
A
= 25°C
0
4.0
8.0
12
V
KA
, CATHODE VOLTAGE (V)
16
0
4.0
8.0
12
16
V
KA
, CATHODE VOLTAGE (V)
20
Figure 10. Reference Input Voltage Change
versus Cathode Voltage
Figure 11. Off-State Cathode Current
versus Cathode Voltage
0.4
Ioff , OFF-STATE CATHODE CURRENT (
m
A)
Input
V
KA
I
off
10
Output
|Za|, DYNAMIC IMPEDANCE (OHM)
IK
50
-
+
0.3
V
KA
= 16 V
V
ref
= 0 V
0.2
1.0
0.1
I
K
= 0.1 mA to 20 mA
T
A
= 25°C
0.1
1.0 k
10 k
100 k
1.0 M
f, FREQUENCY (Hz)
10 M
0
-40
-15
10
35
60
T
A
, AMBIENT TEMPERATURE (°C)
85
Figure 12. Off-State Cathode Current versus
Ambient Temperature
0.24
|Za|, DYNAMIC IMPEDANCE (OHM)
Output
Figure 13. Dynamic Impedance versus
Frequency
60
Output
A vol , OPEN LOOP VOLTAGE GAIN (dB)
I
K
= 0.1 mA to 20 mA
f = 1.0 kHz
0.23
50
-
IK
50
40
15 k
9
m
F
IK
230
-
0.22
+
8.25 k
30
20
10
0
I
K
= 10 mA
T
A
= 25°C
+
0.21
0.20
0.19
-40
-15
10
35
60
T
A
, AMBIENT TEMPERATURE (°C)
85
100
1.0 k
10 k
100 k
f, FREQUENCY (Hz)
1.0 M
Figure 14. Dynamic Impedance versus
Ambient Temperature
Figure 15. Open-Loop Voltage Gain
versus Frequency
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Embedded System
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