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¡¡¡¡positive/negative input. The differential voltage across CSOP
¡¡¡¡and CSON is used to sense the battery charging current,
¡¡¡¡and is compared with the charging current limit threshold to
¡¡¡¡regulate the charging current. The CSON pin is also used as
¡¡¡¡the battery feedback voltage to perform voltage regulation.
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