LP3947
www.ti.com SNVS298B – NOVEMBER 2004 – REVISED APRIL 2013 LP3947 USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC
Check for Samples: LP3947 FEATURES DESCRIPTION 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 I2Cв„ў 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. 1 23 Supports USB Charging Scheme
Integrated Pass Transistor
Near-Depleted Battery Preconditioning
Monitors Battery Temperature
Built-In 5.6 Hour Timer …
