Hiccup mode reduces the power dissipation during an overload event. To enable hiccup operation, make sure that HICCUPEN  = 1 in the CONTROL1 register. If hiccup operation is enabled and the high-side switch current hits the high-side current limit threshold on 32 consecutive switching cycles, the device:

• Stops switching for 128 µs, after which the device automatically starts switching again (it starts a new soft-start sequence)
• Sets the HICCUP bit in the STATUS register
• Pulls the PG pin low. The PG pin stays low until the overload condition goes away and the device can start up and regulate the output voltage.

Hiccup operation continues – in a repeating sequence of 32 cycles in current limit, followed by a pause of 128 µs, followed by a soft-start attempt – for as long as the output overload condition exists.

The device clears the HICCUP bit if reading the STATUS register when the overload condition no longer exists. Figure 7-19 shows 2 cycles of hiccup operation, at which point the over load is removed and the part continues in normal operation.

Figure 7-19 Hiccup Current Limit