Category: Hardware
Product Number: LT3383
Hello,
What is the recommended wiring guidelines for an unused SW and LDO outputs on the LT3383? In our design, we do not need LDO3 and SW4. EN_L3 and EN_B4 are tied to ground. Should outputs be tied to ground, floated, or wired in a specific configuration?
What is the behavior of PGOOD if all outputs are not used? In simulation, on LTSPICE, I am unable to assert PGOOD when all outputs are not utilized.
I would like to request guidance on this situation. Attached is a simulation of our current configuration. SW4, FB_B4, and LDO3 are floating.
Upper pane are enable signals, they are delayed by 4ms and spaced apart by 0.5ms. Middle pane is the outputs of the regulators. Bottom pane is the PGOOD signal. Note that it is at 1.5mV.
Thanks,
Kevin
Edit Notes
Added part model number information for specificity[edited by: kvnyeh at 6:39 PM (GMT -4) on 13 Jul 2026]
