LTC4366 VDD and SD voltage


I have been using LTspice to check how the LTC4366 works.

When a surge comes in from the input, the VDD pin voltage exceeds its absolute maximum voltage 10V.

Please refer to the attached document. 

The VDD pin is clamped to 12V internally, so I don't think it's a problem, but I asked it because the voltage exceeds the absolute maximum rating.




  • 0
    •  Analog Employees 
    on Oct 12, 2021 5:29 PM

    Hello Kazu,  It is normal. The VDD absolute maximum voltage rating is to prevent a >10V external supply being connected directly across VDD and VSS without any current limiting resistor and destroying the ~12V (typical) internal clamps. When external current limiting resistors are used such that the Ivdd abs max current rating of 10mA is met, then VDD-VSS voltage can exceed 10V and that is normal.