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LP2950: Thermal Shutdown feature

Phil2010
Expert 4355 points
Part Number: LP2950

Hi,

the datasheet of LP2950 mentions in chapter 7.1 that it features a Thermal Shutdown. How does it work? At what temperature does it switch of the device? Is it available also in the fixed voltage version of the device?

Thanks and best regards,

Phil

  • 0
    TI__Mastermind 43630 points

    HI Phil,

    The LP2950 is an older device and the PDS is not very clear on how the thermal shutdown works. However, The datasheet does provide the following:

    This tells you that the max recommended die temperature is 125C, and RTJA is X C/W. Where X depends on the package type used. These numbers are for a JEDEC standard high-K board.  To estimate the die temperature in your application you need to use (VIN-VOUT)*IOUT*RTJA to estimate the die temperature rise above the PCB ambient. 

    I am sorry that I don't have the actual data for where the thermal shutdown occurs, but normally it is between 150 and 165C. If you don't need VOUT above 5V, the TPS709 is a 30V 1uA IQ LDO which might be better. Also, if you don't need VIN >18V, we are sampling the TPS7A24.

    I hope this answers your question.

    Regards,