Three-terminal adjustable shunt regulators offer specified thermal stability

This post is sponsored by Texas Instruments. The Texas Instruments (TI) ATL431 and ATL432 are three-terminal adjustable shunt regulators, with specified thermal stability over applicable automotive, commercial, and industrial temperature ranges. The output voltage can be set to any value between Vref (approximately 2.5V) and 36V, with two external resistors. These devices have a typical output impedance of 0.05ohm. Active output circuitry provides a notably sharp turn-on characteristic, making them ideal replacements for Zener diodes in many applications, such as onboard regulation, adjustable power supplies, and switching power supplies. The ATL43x has > 20x improvement cathode current range over its TL43x predecessor. It also is stable with a wider range of load capacitance types and values. ATL431 and ATL432 are the exact same parts but with different pinouts and order numbers. The ATL43x is offered in two grades, with initial tolerances (at 25C) of 0.5%, 1%, for the B and A grade, respectively. In addition, low output drift vs temperature ensures good stability over the entire temperature range. The ATL43xxI devices are characterized for operation from -40C to 85C, and the ATL43xxQ devices from -40C to 125C, says the company.