As the datasheet said that MP8869S has “12A Continuous/15A Peak Output Current”.
How do we define this peak current? What is the pulse width of the peak? and how long should the hiccup hold at least?
When peak current is reached the LS-FET turns on and the device goes into hiccup mode. The peak current is dependant on the inductor selection. Please see the equation:
It will stop hiccuping when the over-current condition is removed.
Please see the section titled “Over-current protection” on page 21 for more information: https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP8869S/.