What this fixed-output LDO does
The LP3879MR-1.0 is a single-output, positive-voltage LDO regulator from Texas Instruments that delivers a fixed 1V rail at up to 800 mA. It operates from a maximum input of 6V, so the upstream rail needs to sit comfortably above 1V plus dropout — typical for low-voltage digital cores, sensor supplies, or post-regulation stages. The 8-PowerSOIC package with an exposed PowerPad helps pull heat out of the die; the pad should be soldered to a copper plane on the board for any load near the 800 mA limit. Enable control is on-chip, letting you sequence the rail with a logic signal.
Key ratings and what they mean for your BOM
The fixed 1V output is not adjustable. The 800 mA current rating sets the load budget; derate for ambient temperature and input voltage. The 60 dB PSRR at 1 kHz gives moderate rejection of ripple from a switching preregulator. Quiescent current is 1.4 mA. Protection features — over-current, over-temperature, short-circuit — are built in.
Package and rework considerations
The 8-PowerSOIC package has a body width of 3.90 mm and a PowerPad on the bottom. That pad is the main thermal path — it must be soldered to a board copper plane. The supplier device package is listed as 8-SO PowerPad — same footprint, same thermal land pattern.