The TPS25970x and TPS25974x variants allow the user to implement overvoltage lockout to protect the load from input overvoltage conditions. The OVLO comparator on the OVLO pin allows the overvoltage protection threshold to be adjusted to a user-defined value. After the voltage at the OVLO pin crosses the OVLO rising threshold, V_OV(R), the device turns off the power to the output. Thereafter, the devices wait for the voltage at the OVLO pin to fall below the OVLO falling threshold, V_OV(F) before the output power is turned ON again. The rising and falling thresholds are slightly different to provide hysteresis. Figure 9-20 and Equation 2 show how a resistor divider can be used to set the OVLO set point for a given voltage supply.

While recovering from a OVLO event, the TPS25970x variants start up with inrush control (dVdt). While recovering from an OVLO event, the TPS25974x variants start up with inrush control (dVdt).