High Efficiency USB Power Management System Safely Charges Li-Ion/Polymer Batteries from Automotive Supplies - Design Note 464

摘要

Automotive power systems are unforgiving electronic environments. Transients to 90V can occur when the nominal voltage range is 10Vto 15V (IS07637), along with battery reversal in some cases. It's fairly straightforward to build automotive electronics around this system, but increasingly end users want to operate portable electronics, such as GPS systems or music/video players, and to charge their Li-Ion batteries from the automotive battery. To do so requires a compact, robust, efficient and easy-to-design charging system.