True reverse current blocking is usually required for USB power path applications to avoid unwanted reverse current for all cases. The scope trace demonstrates this operation. The first section shows an initial state normally ON or V_IN = V_OUT without a load. The second section shows a transient higher voltage applied at V_OUT inducing a reverse current creating a voltage drop from V_OUT to V_IN which reaches threshold for VT_RCB. After the time interval tBLANK the PMOS is turned OFF blocking the reverse current as shown in the third section. Please note that TRCB activation requires transient or continuous reverse current, which can develop voltage drop > VT_RCB. If V_OUT > V_IN and is applied slowly, then reverse current charges input capacitor and V_IN will follow V_OUT without TRCB activation.