Battery Charge Management System

The LP3945 and LP3946 are complete charge management systems that safely charge and maintain a Li-Ion battery or a four-cell Ni-MH LP3945 only) battery pack. The LP3945 offers the flexibility of programming charge current, battery regulation voltage (4.1V/4.2V), battery type (Li-Ion/Ni-MH), and End Of Charge (EOC) termination through the use of I 2 C Interface On the LP3946, these parameters are pro- grammed at the factory per customer specification. The pass Transistor charge current sensing resistor and charge current setting resistors are all integrated inside the LP3945 and LP3946. This eliminates the use of external components and significantly reduces design time and board space. The LP3945 and LP3946 operate in four modes: pre- qualification, constant current, constant voltage and mainte- nance modes. The LP3945 features Ni-MH charging mode as well. The charger has under-voltage and over-voltage protection as well as an internal 5.6 hr Timer to prevent overcharging the battery. 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 up to 1 Amp to the load. By National Semiconductor Corporation
LP3945 's PackagesLP3945 's pdf datasheet

LP3945 Pinout, Pinouts
LP3945 pinout,Pin out
This is one package pinout of LP3945,If you need more pinouts please download LP3945's pdf datasheet.

LP3945 Application circuits
LP3945 circuits
This is one application circuit of LP3945,If you need more circuits,please download LP3945's pdf datasheet.

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