The LM1117IMP-ADJ is a single-output adjustable positive LDO regulator from Texas Instruments, delivering up to 800 mA with a maximum dropout of 1.2 V at full load.
Dropout voltage and load regulation
With a 1.2 V dropout maximum at 800 mA, the input-to-output headroom requirement is tight — a 5 V rail can regulate down to 3.8 V cleanly, but below that the output drops out of regulation. Quiescent current is 5 mA typical, rising to 10 mA max under load.
Industrial temperature grade and protection
Built-in over-current and over-temperature protection shut down the regulator before the die exceeds safe limits.
For new designs, consider the active LM1117IMPX-ADJ — the same die in the same SOT-223-4 package, differing only in the tape-and-reel suffix (the IMP-ADJ is Cut Tape; the IMPX-ADJ is Tape & Reel only).