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LMK61A2-100M: Usual working temperature

Ernst Gerards
Prodigy 60 points
Part Number: LMK61A2-100M
Other Parts Discussed in Thread: LMK04828

Is it usual that the oscillator is running at about 70°C with room temperature of 20°C with only a LMK04828 as load?

  • 0
    TI__Mastermind 32575 points

    Are you using a thermal imaging camera to measure the hottest spot on the die, or a thermocouple on the top of the package?

    What is the PCB temp under the oscillator?  

    Did you follow the PCB layout guidelines and thermal considerations in the dataheet?

    Regards,

    Alan

  • 0 in reply to Alan O
    Prodigy 60 points

    We use a thermal imaging camera.

    The temperature at the bottom side of the PCB is about 50°C.

    The layout is quit similar to the Figure 18 in the datasheet. But what's shown there is not a good  thermal connection. If the GND pin is important for cooling I would place the vias around the pin.

    So as conclusion it's normal that the LMK61A2 heats up more than a usual oscillator and cooling has to be taken in account more than usual.

    Regards

    Ernst

  • 0 in reply to Ernst Gerards
    TI__Mastermind 32575 points

    Yes, I agree with your conclusion .

    Thanks,

    Alan