The device has a built-in charge pump to support high-side protection using an NFET. When the drivers are on, the CHG and DSG pins are driven to the VDD × (1 + A_FETON) voltage level. This means the Vgs across the CHG or DSG FET is about (VDD × A_FETON). When the drivers are turned off and VDD ≥ V_0INH, the CHG and/or DSG output is driven to V_FETOFF.

The charge pump requires VDD > V_{DRIVER_SHUT} to operate. When VDD falls below V_{DRIVER_SHUT}-V_{DRIVER_SHUT_HYS}, the DSG output is off. The CHG output can be turned on in BQ2980 if the ZVCHG charging condition is met. See Section 7.3.9 for more details.