2A adjustable LDO — PSRR and thermal reality
The TPS75401QPWP is a single-output positive adjustable LDO from Texas Instruments, rated for 2A continuous output current with a dropout voltage that depends on the load and junction temperature — the PowerTSSOP package's exposed thermal pad is the path to get that current out without hitting the thermal limit. PSRR is specified at 60dB at 100Hz — this is a line-frequency rejection number, not a wideband spec; above a few kilohertz the PSRR rolls off, so upstream switching noise above 100kHz passes through unless filtered ahead of the LDO. Quiescent current is 125 µA typical — low enough for always-on rails in battery-backed industrial controllers, but not in the micropower class; the Iq is the standing load on the input when the output is unloaded.
Input range, adjustable output, and protection set
Input voltage range goes up to 5.5V maximum — this is a 5V-rail LDO, not a wide-VIN part; the adjustable output spans 1.5V to 5V, set by an external resistor divider on the feedback pin. Control features include an Enable pin for sequencing, a Power Good flag, and a Reset Output — the reset output is a sequenced open-drain signal that tracks the output regulation, useful for FPGA or processor core rail sequencing.