I plan on running an IR LED off of the VCC pin (~5V), with appropriate limiting R. But I also want to run VCC to a few LED driver transistors, to be switched on/off using IO pins. Total current for all would be ~100mA. Am I right in thinking that, when this combo is powered directly from USB, that the VCC *is* the raw USB 5v? Even if so, there could be current limits imposed by trace widths etc. I've looked around quite a bit but haven't seen anything definitive about this. Thanks for any help!