3.3V fixed LDO with 65dB PSRR at 120Hz
The REG113EA-3.3/250: Its 65dB PSRR at 120Hz means the output ripple from a full-wave rectified supply is attenuated by a factor of ~1800 — critical for powering analog front-ends where 120Hz hum couples into the signal chain.
Dropout and quiescent current at load
Maximum dropout voltage is 0.41V at the full 400mA load — the input rail needs at least 3.71V to stay in regulation across the full current range, leaving headroom for a 5V or 3.6V bus. Quiescent current draws 500 µA typical, rising to 1 mA maximum including the supply current — this is a moderate Iq for a 400mA LDO, suited to always-on rails where the load current dominates the power budget.
Package, temperature range, and protection
Housed in an 8-VSSOP (3.00mm width MSOP/TSSOP footprint), the part mounts on a standard surface-mount layout with the enable pin available for sequencing the output rail. Integrated over-current and over-temperature protection shut down the pass element before the die exceeds its safe operating area.