This application report extends a single input charger IC to dual input (AC adapter and USB) applications. First, a low-cost linear charger IC (bq24080) example is presented, and a CFE (charger front-end) protection IC (bq243xx) is used to provide Li-ion battery safety protection from charging-system failures. Second, the bq24100 is given as another example for high-voltage, switch-mode charger applications. Finally, the bq24100 with power-path selection is presented for high-current application.