LP3947,pdf datasheet (USB/AC A

The LP3947 is a complete charge management system that
safely charges and maintains a Li-Ion battery from either
USB power source or AC adaptor. In USB mode, the LP3947
supports charging in low power or high power mode. Alternatively,
the LP3947 can take charge from AC adaptor. In
both USB and AC adaptor modes, charge current, battery
regulation voltage, and End of Charge (EOC) point can be
selected via I2C interface. The LP3947 can also operate on
default values that are pre-programmed in the factory. The
battery temperature is monitored continuously at the Ts pin
to safeguard against hazardous charging conditions. The
charger also has under-voltage and over-voltage protection
as well as an internal 5.6 hr timer to protect the battery. The
pass transistor and charge current sensing resistor are all
integrated inside the LP3947.