The TLV431 device is a low-voltage 3-terminal adjustable voltage reference with specified
thermal stability over applicable industrial and commercial temperature ranges. Output voltage can
be set to any value between VREF (1.24 V) and 6 V with two external
resistors. These devices operate from a lower voltage (1.24 V) than the widely used
TL431 and TL1431 shunt-regulator references.
When used with an optocoupler, the TLV431 device is an ideal voltage reference in
isolated feedback circuits for 3-V to 3.3-V switching-mode power supplies. These devices have a
typical output impedance of 0.25 Ω. Active output circuitry provides a very sharp turn-on
characteristic, making them excellent replacements for low-voltage Zener diodes in many
applications, including on-board regulation and adjustable power supplies.
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