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I have a 1W solar panel that will output about from 0 to 7V (7V in full sun). I want to power up a small USB gadget with it. I need a device that is a step up converter when panel's voltage is under 5V and step down converter when the voltage is over 5V. Does it exist?

For now I only have this step up converter. Maybe I can use it with a 5.1V zener diode so I won't care about when the voltage is over 5V?

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