Active LDO for fixed-rail designs
The Texas Instruments LP3995ITL-2.8/NOPB is a fixed-output LDO delivering 2.8V at up to 150mA from a maximum input of 6V. The 0.1V dropout at full load means the input rail needs only 2.9V to hold regulation — useful when the pre-regulator is a battery that sags under load.
PSRR and quiescent current trade-off
PSRR runs 60dB at 1kHz and 50dB at 10kHz — enough to suppress switching-regulator ripple from a buck converter upstream, but the attenuation drops above 10kHz. If the upstream switcher runs at 2MHz, the PSRR at that frequency is lower than the 1kHz figure; a post-filter may be needed for noise-sensitive analog loads. Quiescent current is 150 µA typical, with a maximum supply current of 200 µA. For a battery-powered sensor that sleeps most of the time, the 150 µA Iq is the baseline drain — the Enable pin lets the system cut that to near-zero between measurement cycles.
Package and temperature grade
Housed in a 5-bump DSBGA (1.41x1.08 mm), the LP3995ITL-2.8/NOPB is a wafer-level chip-scale package — the die is the package. The 0.5 mm pitch demands a controlled solder-paste stencil and a reflow profile matched to the board thickness; the tiny footprint saves board area but complicates manual rework. The over-temperature and short-circuit protection handle fault conditions without external crowbar circuitry.