SLUSE91B September 2020 – January 2022 BQ769142
PRODUCTION DATA
The BQ769142 device supports a series configuration and a parallel configuration for the protection FETs in the system, as well as a system that does not use one or both FETs. When a series FET configuration is used, the BQ769142 device provides body diode protection for the case when one FET is off and one FET is on.
If the CHG FET is off, the DSG or PDSG FET is on, and a discharge current greater in magnitude than a programmable threshold (that is, a significant discharging current) is detected, the device will turn on the CHG FET, to avoid current flowing through the CHG FET body diode and damaging the FET. When the current rises above the threshold (that is, less discharge current flowing), the CHG FET will be turned off again if the reasons for its turn-off are still present.
If the DSG FET is off, the CHG or PCHG FET is on, and a current in excess of a programmable threshold (that is, a significant charging current) is detected, the device turns on the DSG FET to avoid current flowing through the DSG FET body diode and damaging the FET. When the current falls below the threshold (that is, less charging current flowing), the DSG FET is turned off again if the reasons for its turn-off are still present.
When a parallel configuration is used, the body diode protection is disabled.