Positive adjustable LDO for 1A rails
The Texas Instruments LM2941CT/LF03 is a positive adjustable low-dropout voltage regulator delivering up to 1A. Output is set with two external resistors from 5V up to 20V, making it a single-part solution for multiple post-regulation rails in a design. Maximum input voltage is 26V, and the maximum dropout voltage is 1V at full load — so a 5V output needs at least 6V on the input to stay in regulation. The TO-220-5 formed-leads package mounts through-hole and accepts a heatsink tab for thermal management. An Enable pin lets the system shut down the regulator for sequencing or power saving. Protection includes over-temperature, reverse polarity, and short-circuit — no external clamp diode needed for a reverse-battery condition on the input. Operating temperature is 0°C to 125°C — commercial grade. That covers most indoor equipment and appliances but not under-hood automotive or outdoor telecom enclosures without active cooling. Quiescent current runs 10 mA typical; supply current max is 15 mA. For battery-powered designs the 10 mA Iq is high compared to modern micropower LDOs — this part fits better on a line-powered board where quiescent draw is not the dominant constraint.
Dropout and output range — what they mean for the rail budget
The 1V dropout at 1A is the worst-case figure across temperature and load. The adjustable range from 5V to 20V covers common logic and analog rails.