Fixed 1.8V rail for noise-sensitive loads
The LP38691DTX-1.8/NOPB: With 55 dB of PSRR at 120 Hz, this part filters mains-derived ripple on the upstream supply — relevant when the input comes from a rectified AC source or a switching pre-regulator that leaves 100/120 Hz ripple on the bus. Quiescent current is 55 µA typical, and the maximum supply current is 100 µA — low enough for always-on rails in battery-powered or energy-harvesting designs where every microamp counts.
Thermal and package fit for the BOM
Operating temperature spans -40°C to 125°C, so the regulator can sit on a board that sees under-hood ambient or industrial enclosure heat without derating the output current below 500 mA. Integrated over-temperature protection shuts the output down if the junction exceeds the thermal limit — no external watchdog or crowbar circuit needed for fault recovery.
Active lifecycle and compliance posture
ROHS3 compliant per the manufacturer's declaration — no restricted substances above the threshold limits, which clears the part for EU RoHS and similar regional regulations without an exemption expiry risk.