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.
http://onsemi.com
TO−92−3−3
LP SUFFIX
CASE 29
1
2
3
4
TSOP−5
SN SUFFIX
CASE 483
5
3
Features
2
1
• 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
3
SOT−23−3
SN1 SUFFIX
CASE 318
1
• 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
2
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
DEVICE MARKING INFORMATION
AND PIN CONNECTIONS
See general marking information in the device marking
section on page 11 of this data sheet.
• Analog and Digital Circuits Requiring Precision References
• Low Voltage Zener Diode Replacements
Cathode (K)
Reference (R)
+
−
1.24 V
ref
Anode (A)
Figure 1. Representative Block Diagram
Semiconductor Components Industries, LLC, 2005
1
Publication Order Number:
January, 2005 − Rev. 7
TLV431A/D