L432

The L432 is a three-terminal adjustable shunt  regulator utilizing an accurate 1.24V band gap  reference. The output voltage can be set to any  value between 1.24V (V_REF ) to 18V with two  external resistors as shown in the typical  application circuit. The device exhibit a wide  operating current range of 0.2 to 100 mA with a  typical dynamic impedance of 0.25. Active  output circuitry provides a very sharp turn-on  characteristic, making the L432 excellent re-  pla cements for low-voltage zener diodes in  many applications, including on-board regulat-  ion and adjustable power supplies.

When used with an opto-coupler, the L432 is  ideal voltage reference  in isolated feedback  circuits for 3.3V switching-mode power supplies. The L432 shunt regulator is available in two  voltage tolerances (0.5% & 1.0%) and three  package options (TO-92, SOT-23-3 and SO-8).