Usb charger for most smartphones use using LM7805?

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Sunny55

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Hi, i wish to know if a simple LM7805 circuit can provide a usb based charging for most smartphones? What abt the control or limit the charging current and lastly how SAFE to allow it to charge those expensive phones?

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Sunny55.
 

You mean for a car charger? Cheap chinese manufacturers do it like that, they also melt if you're actually pulling 0.5A (or more)

14-5 = 7V

7V * 0,5A = 3.5W

There are plenty of USB current limiter chips out there, but all said and done, the 7805 is not the right choice.
 

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