What the PSRR curve means for noise-sensitive rails
The LDLN025M25R delivers 80 dB of ripple rejection at 100 Hz, rolling off to 60 dB at 100 kHz. That 20 dB slope across the audio band matters when this regulator feeds an analog front-end or a sensor bias rail — the rejection stays above 60 dB where switching-regulator harmonics and digital clock noise live. A buyer cross-shopping a lower-PSRR LDO would need to add post-filtering or accept higher output ripple.
Dropout voltage and headroom on a 5 V bus
Maximum dropout is 0.2 V at 250 mA load. From a 5 V input, the headroom is 2.3 V — plenty for the internal pass element to stay in regulation even with the input sagging to 4.5 V. The quiescent current is 25 µA typical, so the efficiency penalty on a lightly loaded rail is small.
Sourced per RFQ — no stock-holding claim, but the active status means lead times should be standard production cycle.
Housed in a SOT-23-5 (SC-74A) surface-mount package. The enable pin allows the rail to be gated by a GPIO or supervisor output.
Protection features for a robust rail
Over-current, over-temperature, short-circuit, and soft-start protection are integrated. The soft-start limits inrush when the output capacitor is large — relevant if this LDO powers a sensor module with a 10 µF or larger bypass cap.