1A adjustable LDO in SOT-89-5 — what the ratings mean
The R1173H001D-T1-FE delivers up to 1A from an adjustable output rail starting at 1V, with a 6V input ceiling — that 1V minimum floor covers most point-of-load rails in portable and industrial systems without requiring a negative reference. PSRR of 70 dB at 1kHz means the part attenuates switching noise from upstream rails by a factor of about 3,000 — sufficient for powering sensitive analog front-ends without an additional LDO post-filter. Over-current and over-temperature protection are on-chip, which handles the two most common catastrophic failure modes in a compact point-of-load design without external supervisory circuitry.