TLV431A Datasheet, PDF (1/14 Pages) ON Semiconductor – Low Voltage Precision Adjustable Shunt Regulator

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
• 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
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
http://onsemi.com
1
2
3
4
5
1 ²³
TO−92−3−3
LP SUFFIX
CASE 29
TSOP−5
SN SUFFIX
CASE 483
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.
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
1
January, 2005 − Rev. 7
Publication Order Number:
TLV431A/D