Do any TI parts provide the following features:
1. Single-cell Li-Ion charger, min. 2A.
2. Power-path to built-in buck-boost converter, with regulated 4.5V to 5V output, up to 1A output. Must have high efficiency down to 50mA output.
3. Ideally, built-in gas gauge.
bq25606 seems to be a fit (no gas gauge) with a boost converter from the battery, but the power input and boost converter output are on the same pin. It's also not clear what the boost converter output efficiency will be at 50mA output, and how smooth the switchover is if VBUS is used as the system supply.