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TPS22964C: power dissipation rating of discharge FET

K.Yaita
Guru 29690 points
Part Number: TPS22964C
Other Parts Discussed in Thread: TPS22963C

Hi Team,

Is it no ploblem for TPS22964C if supplying external DC 5.5V to VOUT continuously under the condition of ON=Low?
I would like to know if it could damage the device or not in terms of power dissipation rating of discharge FET (red part).


Best Regards,
Yaita / Japan disty

  • 0
    TI__Genius 15710 points

    Hi Yaita,

    What temperature range are you expecting during this case where VOUT=5.5V? Also, how long is the output voltage expected to be present?

    If this added power dissipation is not desired, the TPS22963C (no QOD) may be a better fit here.

    Thanks,

    Alek Kaknevicius

  • 0 in reply to Aleksandras_Kaknevicius
    Guru 29690 points

    Hi Alek-san,

    Thank you for your response.
    I heard my customer wants to know the case under Ta (MAX) =60℃ and duration time is indefinite.
    It is the worst condition he said.

    He already got TPS22964C samples however I will recommend TPS22963C if this case shouldn't be recommended.

    Best Regards,
    Yaita

  • 0 in reply to K.Yaita
    TI__Genius 15710 points

    Hi K. Yaita,

    If the customer truly wants to apply 5V on the output of the device for an indefinite amount of time, I would strongly suggest the TPS22963C. It is the same as the TPS22964C except it does not have the QOD resistance. With the QOD resistance of the TPS22964C, the customer will have a constant current drain on their 5V source, and this would not be very efficient for their system.

    If the customer needs QOD in their application or has a strong preference for the TPS22964C, please let me know and I will see whether or not the device could handle this continuous stress.

    Thanks,

    Alek Kaknevicius