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LTC4367 - Method of protecting VOUT pin from reverse voltage

Thread Summary

The user is designing a circuit with the LTC4367 and seeks advice on adding a resistor to protect the VOUT pin from reverse voltage. The final answer suggests contacting the Analog Devices Technical Support Desk for detailed assistance, as the specific diode characteristics and worst-case current calculations are not provided in the datasheet.
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Category: Datasheet/Specs

Hi ADI experts,

I am designing a circuit using the LTC4367 and would like to protect the VOUT pin from reverse voltage by adding a resistor, based on Note 3 on page 4 of the datasheet.

Note 3 states: "These pins (UV, OV, SHDN, Vout) have a diode to GND. They may go below –0.3V if the current magnitude is limited to less than 1mA."

Could you please help me with the following questions?

1.
Will adding a resistor have any adverse effect on the normal operation of the LTC4367?

2.
During MOSFET gate charging or discharging, is it possible for the current flowing into or out of the VOUT pin to exceed the value of IVOUT specified in the Electrical Characteristics table of the datasheet?

3.
Could you provide the forward voltage versus forward current characteristics of the internal protection diode connected to the VOUT pin, particularly for currents of 1 mA or less, including the temperature characteristics?
I need this information to calculate the worst-case current at the VOUT pin.
If the characteristics of the internal protection diode cannot be provided, could you please advise us on how to design the circuit so that the current at the VOUT pin remains below 1 mA under all operating conditions?

thanks

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