I designed this PCB for testing some peripherals.
I have seen 2 simple PMIC:
I have been think, that maybe is possible to program the satellite when you power on only one subsystem. I mean, all the subsystems are connected to the same lines, but you only power the one that you want to program. And then, it would be awesome to have the CAN on the same USB of charging, and programming.
Desired funtionalities
- Turn off an On different subsystem
- Measure the current of each subsystem
- Program and in the best scenario debug each subsystem, and in the best scenario connect to the OBC
- Charge the batterie
- Connect Solar Panel with MPPT
- BQ25798
Features
- OS102011MA1QN1 SPDT ON/OFF SWITCH, similar but 4 positions SLB1470R
- BQ25798 PMIC
- SLB1570 SLIDE SWITCH
Adafruit solution
- I found this that is close to what I want.
Texas instruments with USB C and MPPT
- BQ25798, good stock -> Seems to be good for this application
- BQ25713B, normal stock
- BQ25713, good stock and good price, it is the newer version of the BQ25703A
- BQ25710, normal stock
- BQ25703A, Super good stock and good price
- BQ25700A, good stock, most expensive
MPPT controllers are:
- BQ24650 -> Cheaper and better stock, but is more a battery charger of Solar panel
- BQ25570
- SPV1040 MPPT. I have seen these for space applications
Chosen design
- BQ25798. This accept to inputs. Put a USB-C PD and a MPPT. Evaluation board, that doesnt use Solar. This one is about how to implement a MPPT on the BQ25798
- It is not necessary a USB PD, is too complex and is not that important for the design.
I can do like this evaluation board put a jumper and I decide what is the input, to be the solar panel or the usb. Never is going to be charged by the USB and the solar panel at the same time.