On Tue, Feb 5, 2013 at 2:31 PM, Marc Nicholas wrote: > Both the MCP1624 and NCP1402 are relatively low noise devices as > they're partially targeted at things like portable audio devices. > However, I seem to recall your application is more demanding, so YMMV > :) Hi Marc, Good suggestion! I've started doing a bit of measuring, and on the little dev board I'm using, I'm drawing 175mA. That's one PSoC, the final device will have two of them, as well as one PIC, and the headphone amp. It's a bit hard to measure true current draw on this board as there are a few other chips on there that are probably contributing. Sadly, this means that your suggestions just don't have quite enough oomph. There are a few chips over at Linear that I'm looking at, I will report back with part numbers once I'm done there and over at OnSemi as well. One thing that might help is if I run the PIC at 3.3V. It shouldn't be a problem as the data passes over RS485 to the PSoC chips, and that would let me just use a LDO regulator for that chip and save the load on the buck boost convertors. I'm starting to look into that as well. Sadly I don't think I can run the PSoC chips at 3.3V. Their datasheets aren't that illuminating, but for the clock speeds I need, I think a 5V source is needed, plus I'm not sure that running the analog sections at 3.3V would be advisable. More info, and replies to everyone else's posts soon! Josh --=20 A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. -Douglas Adams --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .