I'm working on a small 12VDC uninterruptible power system (UPS) for temporarily powering and controlling small 12VDC and 5VDC devices such as small relays or small SBC's such as the raspberry pi. My system will normally be connected to "Shore Power" but I want the input to handle a wide range of voltages. I'd like my system to handle about 10 or 12 watts average / continuous throughput while connected to shore power.
The battery will be 3 small Li-ion 18650 cells in a 3S configuration. Unfortunately I'm having a bit of trouble finding the best parts to use for my deign and was hoping someone could provide some recommendations. I want to make the protection / charging / balancing for the Li-ion cells "proper" while still accepting a wide input voltage. Unfortunately or fortunately TI has a million chips that do some of the functions I want / need.
Q1: Can someone recommend some TI part(s) to handle the functions I want to do as specified in the red boxes in my diagram?
Q2: TI has a lot of Li-ion charge controller IC's. If I use a Li-ion protection IC on the cells, can I just use a wide input voltage buck/boost style converter set to make 12.6vdc as my charger?
Q3: For a system of this small size and power - how much control / protection / balancing do I realistically need for these batteries?
Thanks!
