LTC4365 Over/Under voltage setpoints
The datasheet for the LTC4365 includes a partial diagram of the internal circuitry.

Look at the connections behind the UV (under voltage) and OV (over voltage) pins.  Each input has a comparator that uses 0.5V as a reference.

The UV compares its input to 0.5V and triggers if the result is lower than 0.5V.

The OV compares its input to 0.5V and triggers if the result is over 0.5V.

So, in normal conditions, you want OV less than 0.5V and UV more than 0.5V.  This explains why OV is lower than UV.

Linear uses a single voltage divider with two taps to provide the UV and OV signals from Vin.  This saves you one resistor and some tracks.  It makes the calculations for the divide a tiny bit more difficult, but not all that much.



For reference, the two diagrams from the datasheet.

Internal block diagram of the LTC4365:



Example circuit: