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Thermal resistance at LM5022

masa0301
Intellectual 960 points
Other Parts Discussed in Thread: LM5022, LM3017, TPS40210, LM5085

Hi

Could you tell me thermal resistance at LM5022?

I checked data sheet,

ΘJA=200℃/W is correct? I think too high,if this data is correct LM5022 can not loss over 1W?

LM3017 is 36℃/W

TPS40210 is 57.7℃/W

Best regards,

masa

 

 

  • 0
    TI__Intellectual 1435 points

    Hello Masa,

    That does seem high. 

    The LM5022 MSOP10 (VSSOP10) package does not have an exposed die pad so the thermal resistance is indeed much higher than the TPS40210.     A good comparison is the LM5085 in the VSSOP8 package (no exposed pad).  That device is specified as 126 deg/W.   The thermal resistance of the LM5022 should be similar.  150 deg/W shoudl be a fairly safe assumption.

     I could request a new thermal model but that will take some time (possibly weeks).

    Best regards,

    David 

  • 0
    TI__Intellectual 1435 points

    Masa,

    I reviewed several test reports for devices in the VSSOP10 package (no exposed pad).   Devices with die size like the LM5022 were characterized with theta-j-a from 160 to 170 deg/W.  I was too aggressive with my first reply.  You should use 165deg/W as a safe assumption.

    Best regards,

    David

  • 0 in reply to David Pace
    Intellectual 960 points

    Hi Devid

    Thank you for your reply.

    So, I use 165deg/W as a safe assumption.

    Best regards,

    masa