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TPS51285B: Switching Regulator

Mike Sharafati
Prodigy 10 points
Part Number: TPS51285B


 I need the thermal derating curve for the part above. I can't find it anywhere in the datasheet. I need to see the maximum drawable power vs. temperature curve. Thanks.

  • 0
    TI__Genius 16632 points

    Hi Mike,

    Sorry we don't have such curve. If you want to estimate the temperature, you can refer to datasheet Thermal Information.

  • 0
    TI__Expert 5470 points

    Hi Mike,

    Add a little bit comments: TPS51285B is a controller without integrated power Mosfet. The power loss is mainly on the external Mosfet, which makes Mosfet junction temperature increase and causes the thermal derating with high ambient temperature.

    If you have any special concern here about the thermal of controller, please tell us. Thanks.

    Andrew

  • 0 in reply to Andrew Xiong
    Prodigy 10 points

    I wanted to compare this part with the Richtek part RT6585B which is also the same type of controller. On Richtek datasheet, it has the thermal derating curve associated with the part. I understand that most of the power will dissipate on the external power Mosfets. I just thought that you might have a similar thermal derating curve. Thanks.

  • +1 in reply to Mike Sharafati
    TI__Mastermind 18510 points

    Mike, For the curve, you may calculate it by yourself with RT calculation method based on Tj=125C and Thja shown in datasheet to get it. but the result is based on JEDEC standard board, and actually you can compare the thja data directly, BUT commonly no need to check this data since controller itself has much lower power loss.

     

    Yuchang