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BQ40Z80: Precharge using CHG FET

KIM
Intellectual 550 points
Part Number: BQ40Z80

Hi,

Based on the TRM, CHG FET can be used in precharge mode by setting [PCHG_COMM] = 1.

There is no series resistor in the CHG path to limit the charging current during low cell voltage.

How the CHG FET limit the charging current? Can you explain the precharging using CHG FET instead of external precharge FET?

Thanks!