An AEC-Q100 qualified, linear voltage regulator IC from Allegro MicroSystems, LLC has control, diagnostics and protection features that address requirements of automotive applications. Allegro’s A4481 regulates input voltages between 5.25 to 40 V, down to a 5 V ±1% accurate output voltage, and is able to supply up to 50 mA of load current. This device is designed to power sensors, low power microcontrollers and transceivers in interior and underhood automotive control units.
The diagnostic output from the A4481 includes a Power OK (POK) output. Protection features include output protection from a short-to-battery event up to 32 V, for instance in the case of a wiring harness fault. Protection also includes input undervoltage lockout (UVLO), foldback overcurrent protection, output undervoltage and overvoltage protection, and thermal shutdown.
The A4481KLJTR-T device is available in an 8-pin, lead-free SOIC package with exposed pads to enhance thermal dissipation. List price is $0.64 each in quantities of 1,000.