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LP3947

National Semiconductor
Part Number LP3947
Manufacturer National Semiconductor
Description USB/AC Adaptor Single Cell Li-Ion Battery Charger
Published Apr 4, 2010
Detailed Description November 2004 www.DataSheet4U.com LP3947 USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC LP3947 USB/AC Adaptor, ...
Datasheet PDF File LP3947 PDF File

LP3947
LP3947

Overview
November 2004 www.
DataSheet4U.
com LP3947 USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC LP3947 USB/AC Adaptor, Single Cell Li-Ion Battery Charger IC General 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 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.
n n n n n n n n Near-Depleted Battery Preconditioning Monitors Battery Temperature Built-In 5.
6 hour timer Under Voltage and Over Voltage Lockout Charge Status Indicators Charge Current Monitor Analog Output LDO Mode Operation can source 1 Amp Continuous Over Current/Temperature Protection Key Specifications n 1% Charger Voltage Accuracy Over 0˚C ≤ TJ ≤ 85˚C n 4.
3V to 6.
0V Input Voltage Range n 100 mA to 750 mA charge current range, in charger mode n 100mA to 500mA charge current range, in USB mode n LLP Package Power Dissipation: 2.
7W at TA = 25˚C Applications n n n n n Cellular Phones PDAs Digital Cameras USB Powered Devices Programmable ...


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