Quote Originally Posted by mackrackit View Post
Check out figure 17-1 in the 4550 data sheet.
Just run the 4550 at 3.3 volts and save one regulator.
Nice! . So, the USB module works with 3.3V. Everything starts to make sence now. Thanks a lot. That saves me the use of an extra regulator and some voltage level converters.

Now, for the GLCD backlighting I'm planning to use something like this power booster DC/DC step-up converter. I just need to find the right chip for what I need. Has anybody used these DC/DC step-up converters before? Thanks again.

http://www.onsemi.com/pub_link/Collateral/CAT4238-D.PDF

Robert