Package and board integration — SOT-223-3 footprint
The LT3080IST#PBF comes in a 3-pin SOT-223-3 surface-mount package (TO-261AA equivalent).
Output current and dropout — the real load ceiling
Rated for 1.1A continuous output with a maximum dropout of 1.6V at that load. The output is adjustable from 0V to 36V, matching the maximum input voltage.
PSRR profile — where it cleans and where it doesn't
PSRR starts at 75dB at 120Hz and rolls off to 20dB at 1MHz. This is typical for a 1.1A LDO — it rejects 120Hz rectifier ripple well, but above 100kHz the attenuation drops sharply. If the input comes from a switching regulator running at 500kHz or higher, expect only about 20dB of ripple rejection; a second-stage LC filter ahead of the LDO may be needed.
Protection and quiescent draw
Built-in overcurrent, overtemperature, and short-circuit protection cover the common fault modes. Quiescent current is 500 µA typical — moderate for this output class; not a candidate for always-on battery applications where every microamp counts, but fine for industrial rails where the load current dominates the power budget.