user72000: 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?

user2967: 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.

72000: <p>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?</p>
 2967: <p>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.</p>
