LM25066I: can we use OPERATION(01h) to enable output when EN/UVLO is pulled down?

Hi Ann,

Thanks for reaching out. 

OPERATION (01h) command can't enable the output when EN/UVLO is pulled low. One option might be to pull up the EN/UVLO to directly VIN through a resistor (100 kΩ or more) instead of using the resistor divider. This will enable the controller always whenever VIN is more than UVLO_TH as the UVLO is disabled. Now, OPERATION (01h) command can be used to enable the MOSFET through PMBus. 

Hello Avishek,

Thanks for reply! But customer would like to control EN only by PMBus, we cannot tie EN to Vin since it will enable in the beginning. May we know if we cannot control LM25066I EN via PMBus without enabling by hardware in the first time? Thanks a lot!

Best regards,

Ann Lien