LM3647 Datasheet, PDF (13/17 Pages) National Semiconductor (TI) – Universal Battery Charger for Li-Ion, Ni-MH and Ni-Cd Batteries

4.4.3 Circuitry used for Li-Ion (can also be used for Ni-Cd and Ni-MH if those chemestries are to be supported with the
same charger)
Note: D7 is required to protect Q4 from reverse current.
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