SLUSCC7C July 2016 – June 2018 TPS546C23
The devices implement the TOFF_FALL command to define the time for the output voltage to drop from regulation to 0 as shown in Figure 24. Negative current in the devices can occur during the TOFF_FALL time to discharge the output voltage. The setting of the TOFF_FALL command to 0 ms causes the unit to bring the output voltage down to 0 as quickly as possible, which results in an effective TOFF_FALL time of 1 ms (fastest time supported). This feature can be disabled in the ON_OFF_CONFIG command for the turnoff controlled by the CNTL pin or bit 6 of the OPERATION register if the regulator is turned off by the OPERATION command. If the regulator is turned off by the OPERATION command, both the high-side and low-side FET drivers are turned off immediately and the output voltage is discharged by the load.