MP4559: Absolute Maximum Rating of Enable-Input = 5V?

DC-DC Power Converters
1

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?

best regards
Martin

2

Hello Martin,

Thank you for pointing this out. This is definitely not correct. I will get this sorted out with the DS team.

If you need to get it work over a larger Vin range, then you can add a zener to clamp the voltage to a lower value. Then resistor divide from there.

Regards,
Vinh Tran