MAX8903A charger circuit diagram

Using MAX8903A charger chip can be designed a very simple high efficiency charger circuit using few external electronic parts .
The output current limit can be set up to 2A while USB input current can be set to 100mA or 500mA.
When the device is connected to the external power the system will be switched automatic from battery to the external power .
The DC input for this charger ic operates from 4.15V to 16V with up to 20V protection, while the USB input has a range of 4.1V to 6.3V with up to 8V protection.