I’m building a circuit that requires 12VDC and 5VDC. I’m using the MP3610 with the typical application circuit (figure 11 in the datasheet) to reduce 12VDC to 5VDC. On occassion (mostly during testing) I’d like to run the board with 5VDC only and forgo using the components that requires 12VDC. How will the MP3610 behave with V_Out @ 5VDC and V_In floating? Since EN will be floating in that condition, I’m assuming that the chip will be disabled. Do you recommend the placement of a diode to protect it from back driving?
Thanks for your help,