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LP2996 DDR2 termination regulator magnetic field compatibility

DONGJIN KWAK
Prodigy 40 points

Hi.

I'm going to use LP2996  linear regulator to supply for FPGA Vref pin 0.9V to use sstl18 standard IO. From the datasheet, the recommended circuit is like this picture.

I'm wonder LP2996 regulator has MR compatibility. Because this component should be work in MRI(Magnetic Resonance Imaging).

To check MR compatibility, I tried to move magnet close to electronic components.

Does anyone know LP2996 stick to magnet?

Thank you for your reading!

Kwak.

  • 0
    TI__Genius 12630 points

    Kwak,

    We are working on this question but will need more information. We do not have any direct specs relating to external magnetic interference for this device. Do you know if the device will be used in direct magnetic fields and what the strength of the field is? I don't believe the device to be magnetic because it does not stick to magnets but a strong enough magnetic field could possibly alter operation of the surrounding components.

  • 0 in reply to Michael_DeSando
    Prodigy 40 points

    Michael DeSando1,

      Thanks for your reply! I'm developing prototype PET(Positron Emission Tomography) detector module for PET/MRI. The target MRI magnetic field is 1.5T but it will be good LP2996 could work in higher magnetic field. Because MRI for human whole body use 1~3T and for small animal MRI use 9~10T. The PET detector module will be integrated inside of MRI. So, yes the device(LP2996) will be used in direct magnetic fields and it will be in the influence of RF pulse. 

    It was good LP2996 didn't stick to magnet. What was the strength of the magnet was used in your experiment? And how you expect the device operation could be altered in high magnetic field?

    Kwak.

  • 0 in reply to DONGJIN KWAK
    TI__Genius 12630 points
    Kwak,

    We unfortunately do not have any specifications for this situation. I used a basic office magnet, very low strength to see if the LP2996 was magnetic so maybe not the best test. We are not exactly sure how the device will behave or if any issues will arise. I would advise to try the device inside the machine/magnetic field and see if the device maintains regulation. If damage or incorrect operation results, it might be worth considering creating a shielded case for the device to shield the magnetic field from the circuit while allowing only the PET detector module outside of the shielded case since it seems this is the only device that needs to be in direct magnetic fields.

    Please feel free to keep us updated on what happens. I am curious to know how our device behaves in such conditions. Thanks!

    Regards,
    Michael