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.
The LP3947 operates in four modes: pre-qualification, constant current, constant voltage
and maintenance modes. There are two open drain outputs for status indication. An internal
amplifier readily converts the charge current into a voltage. Also, the charger can operate in an
LDO mode providing a maximum of 1.2 Amp to the load.
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