The TPS259813x variants provide an option to drive an external N-FET for implementing reverse current blocking function. The N-FET is connected in series with the eFuse in a common source configuration as shown in Figure 8-8. The gate of the blocking FET is controlled by the DVDT pin of the eFuse. When the eFuse is turned ON and operating in steady-state, the DVDT pin is driven high which turns the external FET fully ON to provide a low impedance power path from input to output. When the eFuse turns OFF under any condition, the DVDT pin is pulled low and the blocking FET is turned OFF. This ensures there's no current path from the output to input in the OFF state.

Figure 8-8 Reverse Current Blocking Using External FET