The boost converter of the TPS61098x supports a cycle-by-cycle current limit function in boost mode operation. If the peak inductor current reaches the internal switch current limit threshold, the main switch is turned off to stop a further increase of the input current. In this case the output voltage will decrease since the device cannot provide sufficient power to maintain the set output voltage. If the output voltage drops below the input voltage, the backgate diode of the rectifying switch gets forward biased and current starts to flow through it. Because this diode cannot be turned off, the load current is only limited by the remaining DC resistance. After the overload condition is removed, the converter automatically resumes normal operation.

The overload protection is not active in pass-through mode operation, in which the load current is only limited by the DC resistance.

The integrated LDO / load switch also supports over load protection. When the load current of VSUB rail reaches the I_{LIM_SUB}, the V_(SUB) output current will be regulated at this limit value and will not increase further. In this case the V_(SUB) voltage will decrease since the device cannot provide sufficient power to the load.