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This is an article collected by the Internet to make a solar mobile phone charger. You can promote the DIY spirit and make your own mobile phone charger.
The required components are as follows:
(1) MAXl677 is removed from VCD. It is a chip dedicated to LED power supply, 16-pin dual-column QSOP package, input voltage range is 0.7V~5.5V, main output 2.5V~5.5V adjustable voltage and -1OV DC voltage, maximum output current up to 350mA, power efficiency up to 95%.
(2) L1 and L2 core inductors are removed from the original liquid crystal display module, and the model number is D01608C-103.
(3) R1, R2 common chip resistors. The values ​​of R1 and R2 determine the value of the main output voltage. R3, R4: resistance, common chip parts, R5, R6 resistance: ordinary patch components.
(4) D1, D2 Schottky diodes, other models are available.
(5) C1, C4, C6 ceramic capacitors, C2, C3, C5 electrolytic capacitors.
After soldering the components according to the drawings, and after checking the accuracy, the solar battery pack can be connected to provide power to the circuit. I use the UTstarcom 610Q PHS, the charger output 5.2V 320mA current, the battery capacity is 480mA, can fully charge the phone. The better the light, the better the charging effect! If there is no solar battery, you can also use two 1.5V batteries to power the circuit, so that the phone can still be charged without power. In this way, your phone can be recharged in the sun, and interested friends may wish to try (I have not tested the large-capacity mobile phone). 
What this article does not explain is how much solar panels are used. According to the above calculations, to achieve a current of 5.2V and 320mA, at least 2W of solar panels are required, which may actually be larger.
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