ILIM pin open: In this case, the ILIM pin voltage is internally pulled up to a higher voltage and exceeds the V_IREF threshold, causing the part to engage the current limit even if there is no significant current flowing through the device.

ILIM pin shorted to GND directly or through a very low resistance: In this case, the ILIM pin voltage is held at a low voltage and is not allowed to exceed the start-up current limit threshold even if there is significant current flowing through the device, thereby rendering the primary current limit mechanism ineffective during start-up. The device relies on an internal overcurrent detection mechanism to provide some protection as a backup. If the device detects that the backup overcurrent threshold (IOC_BKP) is exceeded but at the same time the primary overcurrent detection on ILIM pin fails, it triggers single point failure detection and latches a fault. The FET is turned off and the FLT pin is asserted.