Is there an all in one circuit which regulates charging, protects and steps up/down an 18650 battery to 12V and 3.3V at the same time, so I can power a sensor and my ESP32?

  • Are you asking for a ready to use module, or for a circuit, that you can build yourself?
    – chrisl
    Jan 27 at 17:55
  • @chrisl preferably a ready to use module Jan 27 at 18:01
  • there probably is such a module ... asking where to get one is an off topic shopping question
    – jsotola
    Jan 27 at 19:01
  • in all ways but convenience, it would be better to use an LDO to take the battery voltage down to 3.3 and use a 12v-only controller.
    – dandavis
    Jan 27 at 19:15
  • @dandavis can I even use an LDO safely? Won't I need some protection against over discharge? Jan 27 at 20:37

I would suggest using a 12V controller, and then adding a 3.3V switching regulator using the 12V supply. That would be 2 off-the shelf components and you're done.

  • You MIGHT be able to find a battery controller that has both 12V and 3.3V outputs, but if not, a 3.3V switching regulator that can convert 12V to 3.3V efficiently is very easy to come by.
    – Duncan C
    Jan 29 at 18:07

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