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TPS7A26: maximum power dissipation

Patrick Pan2
Prodigy 55 points
Part Number: TPS7A26

Hi LDO Team member,

We can’t find dissipation rating table of  the TPS7A26.

Could you help to provide it?

For our appellation as below:

VIN = 12V

Vout = 3.3V

Iout = 0.05A

We need to confirm whether the above application meets the spec of the PD.

BR.

Patrick

  • 0
    TI__Mastermind 23361 points

    Hi Patrick, 

    We do have the 6.4 Thermal Information in the datasheet that can be used to estimate the maximum power dissipation allowed by the device. 

    At the Vin, Vout, and Iload condition you provided, the power dissipation is (12 - 3.3) x 0.05 = 0.435 watts, and the junction temperature rise would be 0.435 x 73.3 = 32C. With 125C maximum junction temperature temp, the maximum allowed ambient would be 125 - 32 = 93C. 

    Regards,
    Jason Song

  • 0 in reply to Jason Song
    TI__Mastermind 23361 points

    Hi Patrick, 

    I saw you did not accept the answer. If you have any concerns, please do let me know. 

    Regards, 
    Jason

  • 0 in reply to Jason Song
    Prodigy 55 points

    Hi Jason,

    No matter current value and as long as the maximum junction temperature at ambient temperature does not exceed 125 degrees,will the chip be damaged?
    For example: (12-3.3)x0.15=1.305W, and the junction temperature rise would be 1.696 x 73.3 = 95.65C With 125C maximum junction temperature temp, the maximum allowed ambient would be 125-95.65 = 29.35C.Will the chip not be damaged if it does not exceed the ambient temperature of 29.35C and 1.305W?

    BR.

    Patrick

  • 0 in reply to Patrick Pan2
    TI__Mastermind 23361 points

    Hi Patrick, 

    The device is designed and tested to work with junction temperature up to 125C and as long as you don't go over 125C for an extended period of time, the reliability of the device will not be affected so you should be good. 

    Regards,

    Jason