500 mA LDO with 60 dB PSRR at 100 Hz — the ripple-rejection anchor for a 2.5 V rail
The MCP1725-2502E/MC is a fixed-output 2.5 V LDO linear regulator from Microchip, rated for 500 mA continuous output.
Dropout and quiescent current — the battery-life and headroom numbers
Maximum dropout voltage is 0.35 V at the full 500 mA load. Quiescent current is 220 µA typical. In a battery-powered sensor node drawing 50 µA in sleep and waking to 200 mA bursts, the regulator's own overhead is a meaningful fraction of the sleep budget — factor it into the battery-life calculation, especially if the enable pin is not used to shut down the LDO during sleep.
Industrial temperature grade and built-in protections
This part is qualified for under-hood or outdoor enclosure use where ambient temperature cycles beyond the commercial 85°C ceiling. On-chip protection includes over-temperature shutdown, short-circuit current limit, and under-voltage lockout (UVLO). The UVLO prevents the output from powering up until the input rail reaches a safe threshold, avoiding brownout operation that could corrupt downstream logic states.
Package and board-fit — 8-DFN with exposed pad
Supplied in an 8-VFDFN exposed-pad package (2 mm × 3 mm DFN, supplier device package 8-DFN). The exposed pad on the bottom is the primary thermal path — the PCB layout must include a thermal via array under the pad to the ground plane to keep junction temperature within limits at 500 mA output. The 0.5 mm pitch demands careful solder-paste stencil design for consistent reflow.