The voltage input spans 100 – 240V at 50/60Hz while the output from the three USB ports can provide 5V to 20V with wattages of 45W, 20W and 15W. The circuitry inside this charger is entirely GaN.
If the 3.3V part is an output and the 5V one an input, the lower voltage part can hardly damage the higher voltage one with overvoltage. And you are not likely to encounter a logic input that ...
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