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Will a switching regulator charge an Ipod? Answered

I have a 16 gb Ipod Touch and I wanted to be able to charge it from an old laptop battery that is 14 volts. I did not like the idea of using a 7805 because it is so wasteful, so I was thinking of using a switching regulator like this one because it has an efficiency of 85% @ 14 volts. http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=LM2591HVT-5.0-ND
Something in me is just worried that because its switching on and off really fast to achieve the voltage that it will not work for charging my Ipod, so I came here to ask "will it work and is it the best option?"



Best Answer 10 years ago

If you don't understand how a switching regulator works, I'd avoid trying to implement one as a project. You need more bits than just the regulator - the inductor, a fast diode and some fancy low ESR capacitors. Build it wrong, and you'll fry something (including the regulator), and/or it'll emit all sorts of radio interference !

You can buy complete devices from folks like Dimension
and these Will Just Work.