I'm having heavy headaches with the LDO regulator of the title... they work when initially tested (either dead bug or on an otherwise empty PCB) but I've had a better than 50% failure rate where subsequent soldering on the board will suddenly cause them to emit 10.7v, 12.5v, 4.8v and indeed any voltage other than the expected 3.3v. Which basically takes out the processor, which is a pain because (a) they're a few quid each and I only have a few left and (b) with 64 legs they're a pain to remove and replace.
So I just built a board with everything on it except the regulator; added the regulator, tested the voltage, all fine. Programmed the processor. Fine. Added six more solder joins to connect a display (I'm adding the expensive bits last as they cost more than the rest of the board in total, and I have a very limited supply of them) and suddenly the thing is pulling half an amp from the bench PSU and throwing ten volts out.
I'm beginning to lose my sense of humour; the soldering iron is earthed at the tip; I'm anti-staticed, the part is wired per the datasheet and well within its load parameters; working units get warm - it's dissipating 600mW but into a nice solid Vcc plane and never gets too hot to touch.
Right now I'm looking for alternatives for the part with a SOT223 pinout...
Neil (grumpy mode=on)
Edit: changed title to correct part number