Fixed 5 V LDO in an 8-WDFN exposed-pad package
With a power-supply rejection ratio of 75 dB at 120 Hz, this regulator attenuates mains-frequency ripple by a factor of about 5600. That matters when the input comes from a rectified AC rail or a switching pre-regulator — the LDO cleans the supply for sensitive analog loads such as op-amp front ends, data converters, or audio circuits.
Dropout and protection — the operating margins
Maximum dropout voltage is 1.2 V at 800 mA output, so the input must stay above 6.2 V to maintain regulation at full load. The input is rated up to 15 V absolute maximum. Built-in over-current and over-temperature protection guard against output shorts and thermal runaway in high-ambient or high-load conditions.
Buyers should evaluate a form-fit-function replacement from the broader LM1117 family, noting that package and pinout differences must be verified against the target PCB footprint.