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LM25122-Q1: single phase or mutliphase

Part Number: LM25122-Q1
Other Parts Discussed in Thread: LM5022

Hello-

We have the following requirements: 3-16.5Vin, 24Vout at 2.2A. Since the application is portable, weight needs to be minimized. However, we are concerned that maybe a single phase design using the LM25122 will not be sufficient.

  1. What do you recommend?
  2. What are the advantages/disadvantages of two phase solution over single?
  3. Is there a better part for this application?

Thanks and Best Regards,

-Tim Starr on behalf of EJ@IN

  • Hi Tim,

    Since size and weight need to be minimized I think that 1 phase would be a good choice for this design. Since this design is 52W it is a reasonable 1 phase design.

    In Multi-phase operation the power is split between the two phases. This means lower currents per phase, smaller components and the chance to use a high switching frequency. This can lead to smaller physical components. However, there are going to be two inductors, 4 MOSFETS and 2 controllers.

    You can also look at the LM5022. Not that this device is non-synchronous so full load efficiency will be lower.

    Thanks,

    Garrett