LTC4352 behavior when input power supply is low

Yes, when the part does not get enough supply voltage level the part won't work. What do you do with VCC pin? If VCC is supplied with a voltage >=2,9 the part will operate down towards 0V (for VIN)

Just for my curiosity: What did you expect from the part with insufficient supply voltage?

kind regards

Markus

Thanks.  I expected it to do what I saw in my LTSpice simulation so I was really looking to clarify there wasn't some corner case where it would do something weird like turn the FETs partially on.  I didn't think it would since (with an external Vcc) it can operate down to 0V on Vin.  In my case, Vcc is internally generated by the device, only the decoupling capacitor and disabled UV input are connected to Vcc.

Good question! You have implemented the scheme? Everything works as it is necessary?