USB charging requires only a constant voltage of +5V DC, with constant current. The LM1117MP-5,0 linear voltage regulator is very popular due to its simplicity of circuit wiring. It outputs a +5V voltage, and 1A current. It has low drop down voltage.
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| A finished circuit soldering |
It's constructed with about a dozen of components I have. The LM1117MP-5,0 is an SMD device, but soldering it on PCB is not difficult.
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| Circuit diagram |
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| PCB Drawing |
I used Proteus 8 to draw the schematic and PCB.
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| Bottom copper pattern with non-mirror |
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| Top silk mirror |
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| Top copper mirror |
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| Three-D view of this PCB design |
Click here to download source file.
