3 A LDO for noise-sensitive analog rails
The LP3856ES-2.5/NOPB is a fixed 2.5 V output LDO regulator from Texas Instruments, delivering up to 3 A continuous current. Its 73 dB to 57 dB PSRR at 120 Hz makes it a strong candidate for powering analog front-ends, ADC/DAC reference rails, or sensitive RF stages where supply noise couples into the signal path. The wide -40°C to 125°C operating range covers industrial control cabinets and under-hood automotive modules.
Housed in a DDPAK/TO-263-5 (TO-263-6 with 5 leads plus tab), the package is hand-solderable with a basic iron and offers good thermal dissipation through the exposed pad. The tab is the output — the PCB copper area under it sets the effective thermal resistance, so a solid pour on the bottom layer helps keep junction temperature in check at 3 A. Surface-mount only, supplied in tube. The enable pin lets you sequence the rail or shut it down for sleep modes — quiescent current drops to 4 mA typical when active, with a 10 mA supply maximum.