I’m planning to make my first PCB and I’m looking for some recommendations on the best way to power my components.
I need to power:
- A LTE modem in the form of a raspi hat
- 5vDC | 200mA*
- An ESP32 devkit v1
- 5vDC | 100mA*
With
- One 12v battery that is charged via solar panels
Noting
- I am using Serial @ 115200 baud
- Power conversion should be as efficient as possible to not drain the battery
- * on max measured load so far
What component should I use? I was thinking of just using one of those DC to DC converters, but I’m not sure on how it would work when I put the devices to sleep. Perhaps I should have a 3.3 volt battery in the circuit as well?