55 dB PSRR at line frequency — what it means for the rail
The LP38693MP-5.0/NOPB delivers 55 dB of power-supply rejection at 120 Hz. That is the ripple-rejection figure a designer cares about when the LDO follows a full-wave rectifier or a switching pre-regulator — 55 dB attenuates a 100 mVpp input ripple to roughly 180 µVpp on the output, which keeps the 5 V rail clean for analog front-ends, ADCs, or low-noise sensor supplies.
Dropout and output current — the headroom budget
Rated for 500 mA continuous output with a maximum dropout voltage of 0.45 V at that full load. The input rail must stay at least 450 mV above 5 V across the load and temperature range to keep regulation — a 5.5 V supply is marginal; 6 V or higher gives the headroom the datasheet assumes. Quiescent current is 55 µA typical, and the maximum supply current drawn by the regulator itself is 100 µA. For always-on peripherals drawing a few milliamps, the LDO's own consumption does not dominate the system power budget.
Temperature grade and package — where this part fits
The -40°C to 125°C operating range covers industrial enclosures, engine-bay electronics, and outdoor telecom equipment.
Product status is Active, so there is no last-time-buy pressure or end-of-life clock for new designs.