According to the Datasheet of the MP4559 Rev. 1.01 the Absolute Maximum Rating of the Enable Pin is given with 5V:
All Other Pins…–0.3V to +5V
According to this, the example schematic in Figure 3, that has a 100k/36,5k Resistor Network from V_IN to EN pins of MP4559 will only work safe operating with V_in < 20V. For higher input voltages, the Enable Ping gets voltages higher than 5V.
Can this be correct?