SLUSCM3K June 2016 – July 2020 BQ77904 , BQ77905
PRODUCTION DATA
During a UV fault, only the DSG FET driver is turned off while the CHG FET driver remains on. When load removal is selected as part of the UV recovery condition, the active CHG FET driver would alter the resistor divider ratio of the load detection circuit. To ensure the load status can still be detected properly, it is required to increase the CHG FET external RGS value to about 3 MΩ. Refer to the Section 9.1.1.4 section for more detail. Note that if load removal is only selected for the current fault recovery (and is not used for UV recovery), it is not required to use a larger CHG FET RGS value.