300 mA LDO with 0.155 V dropout — the headroom rule
The MAX8860EUA25: The key fit parameter is the 0.155 V typical dropout at full load — the input rail must stay at least that far above the target output voltage across the load range, or the regulator falls out of regulation. Quiescent current is 270 µA typical — not a micropower part, but low enough that the regulator's own draw won't dominate a 300 mA load budget. The output can be set anywhere from 1.25 V up to 6.5 V via external resistors, or used at the factory-trimmed 2.5 V fixed option by tying the adjust pin accordingly.
Industrial temperature grade and protection set
The protection block includes over-temperature shutdown, reverse polarity, and short-circuit current limiting, which means a downstream fault or a miswired supply won't necessarily kill the regulator. The Enable and Fault Output control features let a system supervisor gate the regulator on/off and monitor for undervoltage or thermal fault conditions — useful in multi-rail designs where sequencing matters.
Supplied in an 8-TSSOP or 8-MSOP package (3.00 mm body width), with the supplier device package listed as 8-uMAX/uSOP — these are functionally identical footprints. Surface-mount assembly; the 0.65 mm typical lead pitch is manageable on a two-layer board with reasonable trace widths. The exposed paddle (if present on the uMAX variant) should be soldered to a copper pour for thermal relief — the dropout voltage is low, but at 300 mA the power dissipation still needs a path out.