How much current do you require in Arduino/Sanguino or other embedded systems projects?
After responding to the LM2575 inductor question I started to take a closer look at the TI power DC-DC converters. It would not be difficult to replace the linear regulator + or'ing diodes on all my Arduino/Sanguino compatible boards with a TI step-down converter.
This would provide a >90% efficient conversion, input voltages from 5-15V and a 2.5A output that is regulated and adjustable. What would be sacrificed would be the ability to power off of the USB. The incremental cost would be in the $5-$8 range. Wider range inputs are also possible.
Is the 500mA you can get from the USB port all you ever need? Would this be useful in your projects or is it too little current?