5.7V fixed output, 200mA — the headroom and dropout equation
Texas Instruments TPS799L57YZYT is a single-output positive LDO regulator delivering a fixed 5.7 V at up to 200 mA continuous. The 0.16 V maximum dropout at full load means the input rail needs to stay above 5.86 V to keep the output in regulation across temperature and load — a 6 V rail with 2 % tolerance clears this by about 100 mV, but a 5.8 V rail does not. The 70 dB PSRR at 100 Hz dropping to 38 dB at 100 kHz tells you where this regulator filters and where it does not. Upstream switching noise above 10 kHz passes through largely unattenuated — a second-stage LC filter ahead of the LDO is advisable if the supply bus carries a 500 kHz buck converter ripple that would couple into a 5.7 V analog rail.
Industrial temp range and protection — deployment in harsh environments
The 60 µA quiescent current is low enough for always-on sensor nodes that spend most of their time in sleep mode. Built-in over-current, over-temperature, reverse polarity, and under-voltage lockout (UVLO) protection means the regulator shuts down cleanly rather than latching up or passing an out-of-spec output. The Enable pin allows external power sequencing — pull it low to hold the output at zero while the upstream rail stabilises, then release to ramp the 5.7 V rail.
5-XFBGA DSBGA — footprint and rework realities
Housed in a 5-ball 0.4 mm pitch DSBGA (5-XFBGA), the package measures roughly 1.1 mm × 0.9 mm with a seated height under 0.6 mm. The balls are solder-on-pad with no peripheral leads — the PCB land pattern must match the TI-recommended NSMD (non-solder-mask-defined) pad geometry to avoid solder bridging between adjacent balls.
ROHS3 compliant, so it passes the EU RoHS exemption-limit update without a lead-free exemption expiry concern. Sourced through independent distribution channels. Availability and current pricing confirmed at RFQ time against the BOM quantity. The part is quoted to order — no stock-holding claim, genuine TI product with full lot traceability.