2.5-V precision programmable shunt regulator

The 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

0.05Ω. Active output circuitry provides a very sharp turn-on characteristic, making

these devices excellent 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 25°C) of 0.5%, 1%, for the B and A grade, respectively. In

addition, low output drift vs temperature ensures consistent voltage regulation over

the entire temperature range.

The ATL43xxI devices are

characterized for operation from –40°C to +85°C, and the ATL43xxQ devices are characterized for operation from –40°C to

+125°C.