I used the BQ24075 as a reference only, this is not necessarily the chip I want (among other things, it's input is limited to ~6V). I have an application that needs to keep a single-cell 3.7V LiPo battery charged from an external 12-14V DC source (which is a much larger battery bank). Efficiency is important, since I'm charging the LiPo from another battery. The LiPo is used to power an SOC and related logic (3.3V), so that if/when the battery pack is disconnected, the SOC still has power. In that configuration, the 12-14V is almost always available, so the primary purpose of the LiPo is "backup". As such, this is like a "UPS" application, where the LiPo is kept charged and/or "topped off" periodically. Ideally, the battery charger/management solution I'm looking for would handle this automatically, without intervention from the SOC (so no specific need for SMBus or I2C control). For output, if a chip is available that can efficiently provide regulated 3.3V, that would be great, otherwise I would plan to add a buck converter on the output.
I'm looking for chip suggestions, as well as references to app notes that address this topic.
