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TPS65320C-Q1: +36V on Vin

Joan Vicient
Prodigy 20 points
Part Number: TPS65320C-Q1

Hi everyone,

We have a design that seems tot work fine, we power with +24V. Powered from Vin, the LDO output rises to +3.0V, the switcher output becomes +3.3 V and then the LDO is powered from VIN_LDO (switcher output). Everything OK, doesn't it?

Now, we are asked to power the board with 36 V power source.

At datasheet we saw that VIN_LDO max voltage is 22 V. Is there any problem to the LDO, powered from VIN, to have an input of 36 V - 37 V?

In Vin, absolute max rating is 40 V, recommended max is 36 V, powering it with 36V - 37V, could we know if there is lifetime reduction? And if so, how to quantify it?

Thanks in advance!

  • 0
    TI__Intellectual 1990 points
    Hi Joan,

    Thanks for the post! I will get back to you soon with an answer.

    Regards,

    Paul Kundmueller
  • 0 in reply to Paul Kundmueller
    TI__Intellectual 1990 points
    Hi Joan,

    It is highly recommended to NOT power the device above its recommended operating conditions. The ABS MAX of a device are only meant for transient voltage spikes of short duration. The lifetime of the chip can NOT be calculated above the recommended operating conditions. It is highly recommended that the max recommended voltage for VIN_LDO and VIN are 20V and 36V, respectively. If the voltage is higher than these recommended operating conditions for extended periods of time the device's reliability may suffer. Please let me know if there are any questions. Thanks!

    Regards,

    Paul Kundmueller