What is an LM431 IC : Pin Configuration and Its Applications

This IC is a 3-terminal adjustable shunt regulator with ensured temperature stability over the entire temperature range of operation.
LM431 IC is available in the package chip-sized with the technology of national’s micro SMD.
The range of output voltage of this IC is 2.5V to 36V only by choosing two exterior resistors that perform like a voltage-separated network.

Pin Configuration of LM431 IC

This IC includes three pins which are cathode, reference, and anode.

Pins	Description
Pin1 (Cathode):	This is shunt current or o/p voltage
Pin2 (Reference):	This pin is for adjustable o/p voltage
Pin3 (Anode):	This pin is normally grounded

LM431 IC can be used for designing a circuit with a constant current source.
By connecting extra transistors as well as resistors to this IC, it can be used to design a high-power regulator.
By connecting extra resistors to this IC, it can be used to design a low-power shunt regulator.
This IC can be used to replace the Zener diode.
This IC can be used as the voltage regulator.
It is used in monitoring the voltage.
LM431 is used in sink circuits as well as current sources.
LM431 can be used for switching power supplies, and current linear or adjustable voltage.