The bq2404x series of devices are highly integrated Li-ion linear chargers devices targeted at space-limited portable applications. The devices operate from either a USB port or AC adapter. The high input voltage range with input overvoltage protection supports low-cost unregulated adapters.
BQ24040: Single Cell Li-Ion Battery Charger With Auto Start - [Link]
Related Videos
http://www.electronics-lab.com/blog/?p=3463