I was just looking at various modern LDOs, and I see that they are
greatly improved wrt PSRR - I think the older style PNP passers have
been supplanted by new topologies that also even include MOSFETs, so
there should be plenty of choices out there.
So, I'm changing my recommendation - to avoid using older type PNP
output LDOs, while newer types should be OK - just be sure to
consider the specs.
Ed
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