When operating in buck mode, the SW1 pin becomes a negative voltage, albeit for a short period of time (a negative voltage surge occurs). Since the surge voltage value depends on the conditions of use and the state of the PCB, install a Schottky barrier diode (SBD) D2 between the SW1 pin and GND as a protection if necessary. *This is a measure against surges that occur during regenerative current during the power FET OFF period.
　
When operating in boost mode, the SW2 pin tends to generate a surge higher than VOUT, so if necessary, provide an SBD (the SW2 side is the anode side) between SW2 and VOUT as well.

(Published in March 2022)

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