I'm looking at an existing design that has a polyswitch device to limit our exposure to shorts on a cable.
The existing part will hold 0.050A and trip at 0.10A which is right for us, but it's thruhole. All the SMD devices I've seen are 0.150 trip, and they tend to have larger untripped resistance. If I can find a suitable SMD PTC, then I'm all for that.
I need to emulate the original part, with low on resistance, with some minimum parts count circuit.
I looked at setting up a CCS with an LDO, but couldn't find anything that had the right parameters. Vin is Vin by a volt or two.