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LM25122-Q1: 12V-24V Interleaving Questions

TRM
Intellectual 1785 points
Part Number: LM25122-Q1
Other Parts Discussed in Thread: LM5122-Q1, PMP21112, LM5122

Hi,
I have a customer looking at doing a design with the LM25122-Q1 with the following specs and I have a couple questions:

Specs:

  • Vin = 12V
  • Vout = 24V
  • Iout = 12.5A

Questions:

  • Can this design be done reliably in a single-phase configuration or is a multi-phased configuration required due to the high output current/power?
  • Is there a specific threshold (Current/Power) where you should switch to a multi-phased design?
  • If multi-phased is recommended, are there any other ICs that might be better suited for a single-phase version of this design?
  • What is the difference between the LM5122-Q1 and LM25122-Q1? It looks like it is just the Input/Output Voltages and switching frequencies.

Thanks
-Tyler

  • 0
    TI__Guru 68495 points

    Hi Colleague, 

    Thank you for asking.  Your output is 300W, so I strongly recommend at least dual phase.  There are similar reference designs like PMP7850.1 and PMP21112. 

    There is specific threshold because the IC is a controller and the power level is basically determined by the external components. However, based on our experience, when you trading off the thermal, cost, solution side, etc, one LM5122 or LM25122 can handle up to 200W.  Higher than that may still work but the overall cost may not be optimal.

    For your operation conditions, the LM5122 or LM25122 fits best. 

    You are correct about the differences between the two parts. 

    Lastly, you may also submit a reference design request to TI Reference Design Group to create a design for your customer.

    Thanks,

    Youhao Xi, Applications Engineering