Hi Sir,
Here we are searching for a Li-lon Battery Charger chip which supports both 3-cell and 4-cell Lithium-lon batteries, do you have any recommened chips for us?
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There is a battery charger selection tool here: http://focus.ti.com/en/download/aap/selectiontools/battery-chargers/tool.htm
The bq247xx family will support a 3 or 4 cell pack, but these ICs require a host/controller.
The bq246xx family is a stand alone charger that can charge 3 or 4 cell packs without a host.