Good evening friends.
Can I provide 12-14.x volts to the Boron via the VUSB pin and also use and charge a backup Lipo battery using the provided onboard charging and SOC / Fuel Gauge circuitry? There will be periodic inductive loads on the 12v battery, and charging activity too (14+ volts).
Looking at the datasheet for the BQ24195 it seems operating range is 3.9 - 17v, absolute maximums are a bit higher, and looking at the datasheet and the block diagram for the Boron it looks like it shouldn’t let the magic smoke out to power from 12-14.x volts AND use a lipo as a backup (I assume the IC will treat it the same as a regulated 5v USB power source). Approx: 12-14v -> VUSB / VIN on BQ24195 -> 3.3 regulator via SW and lipo via BAT.
What should I consider to protect the hardware (more heat sinks / cooling, voltage limiting components, additional regulator, etc.). How about reliability?
Is it correct to assume I won’t be able to put 12+v on VUSB pin and plug in and use USB (unless there’s no power line and it’s just data).
Are VUSB and VBUS the same pin?