2.5V fixed LDO for noise-sensitive rails
Key features include an enable pin for shutdown control, over-current, over-temperature, and short-circuit protection, and a maximum input voltage of 16V. The fixed output eliminates the need for external resistor dividers, saving board space.
Dropout and PSRR — what they mean for your rail
The 45dB PSRR at 1kHz tells you how well the LDO rejects input ripple at that frequency. For a switching regulator feeding this LDO, if the switcher's fundamental or harmonics land near 1kHz, the attenuation may be marginal — a second LC stage or a higher-PSRR LDO might be needed for sensitive analog or RF loads.
Quiescent current and always-on budget
The 95 µA quiescent current is the current the LDO consumes just to stay alive, regardless of load.
Package and footprint
The SOT-23-5 package is a standard 5-pin surface-mount footprint, shared with many other LDOs and logic devices. The enable pin is active-high; leave it floating or tie to Vin if not used.
Lifecycle and sourcing posture
The LP2985AIM5-2.5/NOPB is listed as Active with RoHS3 compliance. There is no end-of-life notice or last-time-buy window. For BOM planning, no immediate lifecycle risk exists, and the NOPB suffix confirms lead-free / RoHS3-compliant construction.