Features: · Supports USB Charging Scheme· Integrated Pass Transistor· 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 ...
LP3947: Features: · Supports USB Charging Scheme· Integrated Pass Transistor· Near-Depleted Battery Preconditioning· Monitors Battery Temperature· Built-In 5.6 hour timer· Under Voltage and Over Voltage Loc...
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Full Charge Vmax | 4.2 Volt |
Input Min Voltage | 4.3 Volt |
Input Max Voltage | 6 Volt |
Battery Cells | 1 cell |
Battery Chemistry | Li-Ion |
Charge Current | 100 to 750mA (wall), 100 or 500mA (USB) |
Charge Modes | Prequal, CC, CV, maintenance |
On/Off Pin | Yes |
Special Features | Accepts either AC adapter or USB power source, includes battery temperature monitoring, LDO mode, safety timer, charge status indicator |
Full Charge Vmin | 4.1 Volt |
Error Flag | No |
Adjustable Output | Yes |
Voltage Fault Protection | No |
Output Current | 750 mA |
RegType | Linear/LDO Controller |
Temperature Min | -40 deg C |
Temperature Max | 85 deg C |
PowerWise | Yes |
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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.