The LM73605-Q1/6-Q1 hiccup current protection at extreme overload and short circuit conditions. Hiccup is activated when V_OUT droops below 40% (typical) of the regulation voltage and stays for 128 consecutive switching cycles. Hiccup is disabled during soft start. In hiccup, the device turns off V_OUT and re-tries soft start after 46-ms wait time. Cycle repeats until overcurrent fault condition has been removed. Hiccup mode helps reduce the device power dissipation and die temperature under severe overcurrent conditions and short circuits. It improves system reliability and prolongs the life span of the device.

Under overcurrent conditions when V_OUT droops below regulation but above 40% of regulated voltage, the LM73605-Q1/6-Q1 in cycle-by-cycle HS and LS current limiting protection mode.

Thermal shutdown prevents the device from extreme junction temperature by turning off the device when the junction temperature exceeds 160°C (typical). After thermal shutdown occurs, hysteresis prevents the device from switching until the junction temperature drops to approximately 135°C. When the junction temperature falls below 135°C, the LM73605-Q1/6-Q1.