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SM28VLT32-HT: Power usage

May
Genius 9880 points
Part Number: SM28VLT32-HT

Hi Team,

Customer want to confirm some item regarding  core power usage. 

1. Reason the core power usage is so high? 

2. Is there a way to reduce the core power usage?

According to them,  SM28VLT32-HT power usage rating for core seems to be very high at 0.24W and they plan to use 6 of them which result to 1.44W.

Thank you and looking forward for your kind response.

Regards,

Maynard

  • 0
    TI__Expert 6680 points

    Hi Maynard,

    Could you provide a schematic of how this is being used?

    This device is specified to have a typical Iddvcore (current draw from Vcore) of 127mA. So assuming you're running Vcore at 1.9V, this would give you a Vcore of 0.2413W - so what you're seeing on your device is typical for these devices.

    As for reducing power consumption, there's not a whole lot you can do here. Since the main power consumption comes from Vcore, you could try reducing this to 1.8V or lower (which would not be recommended). You could also try reducing the clocking frequency and see if that helps any with power consumption.

    Thanks!

    Chad Crosby

  • 0 in reply to Chad Crosby
    TI__Genius 9880 points

    Hi Chad,

    thank you for your response. Customer have follow up question. 

    1. So what determines the low 1.8V point as the sort of cutoff?

    2. What is expected to happen when the applying less than 1.8V in this case?

    3. Is the 1.9V just the middle value of the range that can be used, or is it an optimal value for some reason?

    Regards,

    Maynard

  • 0 in reply to May
    TI__Expert 6680 points

    Hi Maynard,

    May said:
    1. So what determines the low 1.8V point as the sort of cutoff?

    1.8V is the lowest voltage that TI can guarantee that our device will be operable and is found over temperature and many different wafer lots. While some lots may be able to work at lower voltages than others, TI can only guarantee 1.8V.

    May said:
    2. What is expected to happen when the applying less than 1.8V in this case?

    The best way to see what happens is to test it - however, you'll be operating outside of TI's recommended spec.

    May said:
    3. Is the 1.9V just the middle value of the range that can be used, or is it an optimal value for some reason?

    I'm not sure if 1.9V is optimal for this part or not, but I would assume so.

    Thanks!

    Chad Crosby