Li Ion Battery Charger Circuit Using IC LP2951

  
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Unlike lead acid batteries one good thing about the Li-Ion batteries is that they can be charged at 1C rate initially. It means the charging current may be as high as the rated AH of the battery at the onset. The design presented in this article can be used for charging a single 3. 7V Li-ion cell or a standard cell phone battery externally at a rel
Li Ion Battery Charger Circuit Using IC LP2951 - schematic

atively slower rate. In the given circuit the IC LP2951 becomes the main active component which has been specifically chosen because it is capable of delivering an output voltage thats very stable over temperature. Initially when the particular discharged cell has a voltage level thats below the 4. 2V, the IC generates maximum current to the cell which is around 160mA as discussed above. Once the terminal voltage of the Li-Ion cell reaches the 4. 2V mark, the IC LP2951 instantly inhibits the current so that the battery can longer exceed the 4. 2 V level. The big value resistors included in the circuit ensures the "OFF" current drain of the battery to below 2mA, the 330pF capacitor stabilizes the circuit from unwanted noises created at thehigh-impedance feedback node.



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