5 V fixed LDO — 1 A continuous with 0.8 V dropout
The Texas Instruments LP38692MPX-5.0/NOPB is a single-output positive linear regulator delivering a fixed 5 V at up to 1 A continuous. Quiescent current is 55 µA typical, with a maximum supply current of 100 µA — low enough for always-on rails in battery-backed or standby circuits where the regulator's own draw must not dominate the system budget.
Industrial temperature grade and thermal management
The SOT-223-5 package (TO-261-5 equivalent) has an exposed pad on the bottom — the primary thermal path for the 1 A output. Board layout must connect this pad to a copper plane to keep the junction temperature within the operating range at full load. Built-in over-temperature protection shuts the die down under sustained overload or high ambient; the part cycles off and on until the fault clears. No over-current or reverse-voltage protection is integrated — external circuitry is required if those failure modes are expected.
PSRR and ripple rejection in signal-chain rails
Power-supply rejection ratio is 55 dB at 120 Hz — this is the line-frequency ripple rejection figure. Above the crossover frequency the PSRR rolls off; upstream switching noise above a few hundred kHz will pass through unless filtered ahead of the LDO.