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How important is the inclusion of a current limited high-side power switch for power management?

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TurtleEnthusiast

Joined Jun 3, 2025
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Should I bother including this current limited high-side power switch component (ST890) on my custom board. I want to know if this component is as critical on a board that is expected to be powered either by USB or an external battery.

From what I’ve read, it enables/disables power delivery based on the ON pin and is capable of switching off automatically when exceeding a certain temperature. This component is used in the B-L4S5I-IOT01A board, but the active-low ON input is connected to the ST-Link chip, which is also part of the board. Apparently, the firmware in this secondary chip is proprietary, so I have no idea when ON should be high or low. Could I simply include this component and leave the pin low, as the component still acts as protection?
 

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