In addition to the cycle-by-cycle current limit function, the TPS61379-Q1 also has output short protection. If the output current causes low-side FET to reach current limit and pull the output voltage below the input voltage, the device enters into short circuit protection mode which triggers the hiccup timer. When the hiccup timer is triggered, the device limits the current to a relative lower level for 1.8 ms, and then shuts down. After 67 ms, it restarts. If the short condition disappears, the device automatically restarts.

When FB voltage is below ≤ 0.1 V during fault condition, the current limit threshold is reduced to 1/5 of the programmed current limit, and frequency is clamped to 1.1 MHz if the FREQ pin setting is greater than 1.1 MHz and VIN and V_O voltage delta is greater than 6 V.