PSRR profile and output regulation
The LP5910-1.1YKAR delivers a fixed 1.1V output at 300mA from a single positive regulator, with a PSRR that starts at 80dB at 100Hz and rolls off to 25dB at 2MHz — this means upstream switching noise at lower frequencies is heavily attenuated, while high-frequency ripple above 1MHz passes through with less than 30dB rejection, so the downstream load sees cleaner rails when the input is a quiet linear source rather than a fast-switching converter.
Temperature grade and protection
Rated for junction temperatures from -40°C to 125°C, this LDO suits industrial and automotive environments where the ambient can exceed 85°C — the 125°C TJ ceiling gives margin for self-heating at full 300mA load in a compact DSBGA package. Built-in protection includes over-temperature shutdown, reverse polarity blocking, and short-circuit current limiting — these three features cover the common failure modes in a single-supply rail: a reversed battery connection, a dead-short on the output, or a thermal runaway condition in a confined enclosure.
Housed in a 4-bump XFBGA (DSBGA) package measuring 0.9mm x 0.9mm typical, the LP5910-1.1YKAR requires a surface-mount footprint with the four bumps on a 0.5mm pitch — the small outline means the decoupling capacitor must sit within 2mm of the input bump to keep the loop inductance below 2nH for stable regulation at 300mA. The enable pin (active high) allows the regulator to be shut down to a quiescent current of 25µA typical — in battery-powered designs, pulling EN low drops the supply current from 350µA max to the Iq floor, extending standby life.