250mW automotive linear regulator integrates diagnostics and protection

December 07, 2015 // By Graham Prophet
Featuring a 50V load dump rating with short-to-battery protection, the A4481 from Allegro MicroSystems Europe is an AEC-Q100 qualified linear voltage regulator IC with built-in control, diagnostics and protection features that address the requirements of automotive applications.

The device regulates input voltages between 5.25 and 40V down to an output voltage of 5V ±1%, and is able to supply up to 50 mA of load current. As a result, it will power sensors, low-power microcontrollers and transceivers in automotive control units for interior and under-hood applications.

The diagnostic output from the A4481 includes a “power OK” output, while protection features include output protection from a short-to-battery event up to 32V - in the case of a wiring harness fault, for example - input undervoltage lockout, foldback overcurrent protection, output undervoltage and overvoltage protection, and thermal shutdown.

The A4481KLJTR-T is available in an 8-pin SOIC package with exposed pad for enhanced thermal dissipation. [ data sheet ]

Allegro MicroSystems; www.allegromicro.com