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CSD95496QVM: what is continuous current output when Vin = 5V

Alice Wang1
Prodigy 80 points
Part Number: CSD95496QVM
I want to use the CSD95496QVM in my design. From the datasheet, it only shows Vin = 12V, continues output current = 40A. I wonder if Vin = 5V, what is the maximum output current it can supply?
I only have 5V input power, but I need 30A continuous output current.
image.png
Can you provide this information?
Thanks.
  • 0
    TI__Expert 3525 points

    Hi Alice,

    With lower Vin such as 5V, the power loss is expected to be slightly higher if all other conditions kept same. The max load current possibly will be limited by the thermal design comparing to Vin=12V.

    What will be the Vout, switching frequency, and output inductance you plan to use?

    Best,

    Qingquan

      

  • 0 in reply to Qingquan Tang
    Prodigy 80 points

    Hi Qingquan,

    Thanks for the quick reply.
    The output voltage Vout is in the range of 0.7V to 0.963V. 
    PWM frequency range: 200 kHz to 2000 kHz.
    Output inductance: 0.3uH
    Thanks,
    Alice
  • 0 in reply to Alice Wang1
    TI__Expert 3525 points

    Hi Alice,

    Thank you for the update.

    Based on my understanding, you should be able to get 30A continuous current with proper PCB layout and thermal design.

    However, the switching frequency upper range is too high, we recommend max frequency to be 1.25MHz.

    Best,

    Qingquan

  • 0 in reply to Qingquan Tang
    Prodigy 80 points

    Hi Qingquan,

    If we set the switching frequency to be 1.2MHz, do you think we can get at least 30A continuous current?

    Just wanted to be sure if I need a boost converter in my design. Or if there is another similar part available I can use?

  • 0 in reply to Alice Wang1
    TI__Expert 3525 points

    Hi Alice,

    With high switching frequency, high switching loss is expected, so I would expect higher power loss and you may need to be even more cautious about the thermal design.

    Any specific reason you need so high switching frequency?

    Anyway, if the thermal had been properly taken care of, 30A continuous current is still possible.

    If you prefer to have higher design margin, I would suggest CSD95495 with higher current rating and in same package. So you can try with CSD95496 first and still can swap to CSD95495 later with no other BOM change required.

    Best,

    Qingquan

  • 0 in reply to Qingquan Tang
    Prodigy 80 points

    Hi Qingquan,

    Thanks for the information and thanks for the help.