The BQ40Z80 device includes support for a circuit configuration where the CHG and DSG FETs are in parallel rather than in series.
- In a series-circuit configuration, if the CHG FET is off and the DSG FET is on, then if discharge current greater than Charge Current Threshold is detected, the CHG FET is turned on quickly to protect the CHG FET body diode from discharge current flowing through it. If the FETs are configured in series, select FET Options[PARALLEL_FETS] = 0.
- In a parallel-circuit configuration, if the CHG FET is off and the DSG FET is on, then the CHG FET is not turned on if discharge current is detected. If FETs are configured in parallel, select FET Options[PARALLEL_FETS] = 1.