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
e c o n o m i c a l T O
−9
2
−3
a n d m i c r o s i z e T S O P
−5
a n d
SOT−23−3 packages.
Features
http://onsemi.com
TO−92−3−3
LP SUFFIX
CASE 29
1
2
3
4
5
1
2
3
TSOP−5
SN SUFFIX
CASE 483
•
Programmable Output Voltage Range of 1.24 V to 16 V
•
Voltage Reference Tolerance
"1.0%
for A Series and
•
•
•
•
•
"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 11 of this data sheet.
Reference (R)
+
−
1.24 V
ref
Cathode (K)
Anode (A)
Figure 1. Representative Block Diagram
Semiconductor Components Industries, LLC, 2005
January, 2005
−
Rev. 7
1
Publication Order Number:
TLV431A/D