The TLV117125DCYT: Rated for 1A continuous output at 2.5V fixed — this powers a 2.5V digital core, I/O bank, or analog front-end that draws up to 1A without needing an external pass transistor. PSRR is 65 dB at 100 Hz — this attenuates 100 Hz ripple from a rectified line-frequency supply by a factor of ~1800. For a 2.5V rail feeding a sensitive ADC or PLL, that keeps the output clean enough that the noise floor stays below the converter's LSB step. Above 100 kHz the PSRR rolls off; upstream switching noise at that frequency needs a ferrite bead or LC filter ahead of the LDO. Quiescent current is 100 µA typical — the regulator's own draw is low enough for always-on rails in battery-powered gear, but not as aggressive as a micropower LDO (which would trade dropout or PSRR). The 100 µA Iq is a reasonable middle ground for a 1A part.
Protection and temperature range
Built-in over-current, over-temperature, reverse polarity, and under-voltage lockout (UVLO) protection — the UVLO threshold prevents the output from turning on until the input is high enough to keep the pass element in dropout margin, avoiding brown-out conditions on the load.