The LP2985AIM5X-3.8/NOPB is a fixed-output linear regulator delivering 3.8V at up to 150mA from a 16V max input rail. This is a common voltage for powering analog front-ends, sensor bias, or low-power MCU I/O banks that need a clean, low-noise supply. The 95 µA quiescent current keeps the regulator's own draw low enough for always-on rails in battery-powered designs.
PSRR and noise rejection — why 45dB at 1kHz matters
The 45dB PSRR at 1kHz means the regulator attenuates ripple on the input by a factor of about 178. If the input rail carries 100 mVpp switching noise at 1kHz, the output sees roughly 0.56 mVpp — clean enough for a 12-bit ADC reference or a precision op-amp supply. Above 1kHz the rejection typically rolls off, so a low-pass filter ahead of the regulator helps if the switching frequency is higher. The enable pin lets you sequence the rail on/off independently, useful for power-sequencing requirements in multi-rail designs. Protection features — over-current, over-temperature, and short-circuit — cover the common fault modes without external clamp diodes.
Package, temperature grade, and compliance
Housed in a 5-pin SOT-23 (SC-74A) package, the LP2985AIM5X-3.8/NOPB fits into compact layouts with a 0.95mm pitch.