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How do I design a Step Down Switching Circuit from a 12V 3A lead acid battery to a 5V 1A Load? Answered

I am designing a solar panel charger for usb devices, I have a 12V 3A lead acid battery and I want that reduced to 5V 1A to comply with most portable devices, Help is much appreciated and diagrams would be ideal

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A suitable 5 volt regulator should do the trick. the dat sheet will have suitable circuits on it.

A good choice here

I have looked but a lot of those are linear circuits where as I need a switching circuit