Li Ion Battery Charger Circuit Using IC LP2951
The following post explains a very simple yet safe Li-Ion battery charger circuit using just a single IC LP2951. 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 relatively slower rate. The diagram depicts a configuration which was used for charging a Li-Ion cell of a portable stereo unit. The charging specification of the circuit may be summarized as under: Maximum charging current = 150mA Full charge volt = 4.2V +/- 0.025V Charge Current = set at current limit charge mode. 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 that's very stable over temperature. The...