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LMZ31710: Which is better? one DC/DC converter or two DC/DC?

Yoonsun Kim
Expert 1860 points
Part Number: LMZ31710
Other Parts Discussed in Thread: TPSM53604

Hello,

There are two parts on my board and both need 3.3V.

Two parts are functionally separated but physically connected to each other by IO lines.

One part will control internal part  and the other will drive and receive signals to/from outside of board.

Current consumption of one part will be about 3A. And the other will consume about 2.5A.

Is there any difference(pros and cons) between when one DC/DC(over 7A) converter is used and when two DC/DC(4A) converters are used?

  • 0
    TI__Guru 50120 points

    Hi Yoonsun,

    Generally if you need to have output current larger than 10A then you will need two power modules to current share for up to 20A output loading. The LMZ31710 is rated for 10A and will suffice if you are only planning on pulling a cumulative 5.5A. 

    Figure 7 Efficiency curve provides an understanding of the expected typical efficiency for 3.3V output (solid black trace 5V input application. Since there is a marginal decay of efficiency between 3A and 6A (roughly ~2-3%) it may make sense to only use one LMZ31710 to provide a 3.3V output rail for your downstream devices.

    If you are interested in a newer DC/DC power module rated for 4A, the TPSM53604 was recently released this month.

    Regards,

    Jimmy