I have an ESP32 Development Board (or at least a clone of one) that I was intending to power via a 3.7v lithium cell -> charge controller -> 3.3v voltage regulator on the 3.3v pin
Is this going to upset or damage the existing 3.3v regulator onboard? What if I had both the USB and external 3.3v regulator connected at the same time (which programming)? It seems unlike the 5v input there is not a diode protecting the voltage regulator.
If that's going to be a problem I'll have to switch out the 3.3v regulator in my design for a 5v, I just figured the 3.3v regulator would be more efficient.
ESP32 Development Board with 3.3v in and USB
Re: ESP32 Development Board with 3.3v in and USB
I read this:
“Above options are mutually exclusive, i.e. the power supply may be provided using only one of the above options. Attempt to power the board using more than one connection at a time may damage the board and/or the power supply source.”
From:
https://docs.espressif.com/projects/esp ... vkitc.html
You should check the documents for the board you are using. Or do the analysis yourself (a complex dynamic transient analysis).
“Above options are mutually exclusive, i.e. the power supply may be provided using only one of the above options. Attempt to power the board using more than one connection at a time may damage the board and/or the power supply source.”
From:
https://docs.espressif.com/projects/esp ... vkitc.html
You should check the documents for the board you are using. Or do the analysis yourself (a complex dynamic transient analysis).
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