I'm currently trying to make a 4xAA portable USB charger, because my tablet only has a 2600mah, and lasts 2 1/2 hrs before dying. But I've run into a big problem, 4x1.5v=6v... And I have only been able to find 1 single regulator that may work, but every document I've read about it says it can take in 7v, 8v, 7.5v, but someone asked a similar question on a different forum and he was told the LM2576 would work... To sum things up, I want to know if the LM2576 (5v) can accept 6v in.