Figure 8-31 FLT Pin Behavior With an Overcurrent Event on Channel Enable

Figure 8-32 shows the device fault and retry behavior when there is a slow creep into an over-current event. As shown, the switch clamps the current until it hits thermal shutdown, and then the device will remain latched off until the AUTO_RETRY_DIS bit is low.

Figure 8-32 Current Limit – Latched Behavior

Figure 8-33 shows the behavior with AUTO_RETRY_DIS = 1 (Latched behavior); hence, the switch will retry after the fault is cleared and t_RETRY has expired.

Figure 8-33 Current Limit – AUTO_RETRY_DIS = 0

When the switch retries after a shutdown event, the fault indication will remain until V_OUTx has risen to V_BB – 1.8 V. Once V_OUTx has risen, the FLT output is reset and current sensing is available. If there is a short-to-ground and V_OUT is not able to rise, the SNS fault indication will remain indefinitely. Figure 8-34 illustrates auto-retry behavior and provides a zoomed-in view of the fault indication during retry.

Figure 8-34 Fault Indication During Retry