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TPS7A3725DRV maximum output current rating

Justin Wang
Prodigy 50 points
Other Parts Discussed in Thread: DS250DF410, TPS7A37

Dear Sir,

I'm doing the QSFP28 Active cable design with TPS7A3725DRV

as LDO from 3.3V to 2.5V for 2 pcs DS250DF410.

The current consumption is about 1.1A now.

I've check the spec, it told the current  limiting will active while ICL approaching 1.5A.

Does this mean it's safely to use TPS7A37 at 1.1A (if the heat dissipation is well handled)?

Thanks!

  • 0
    TI__Mastermind 49960 points

    Hi Justin,

    When we recommend 1A maximum, we are guaranteeing the long-term reliability of the device. So running over this as a nominal current could potentially impact the long term reliability.

    The minimum current limit could be 1.05A so if your application is demanding 1.1A, there is a chance that a small percentage of devices will go into current limit. (Please note Figure 12 is average current limit).  Beyond this, you are very correct in that there is another issue of thermal concern. This is a function of (VIN-VOUT)*IOUT*TJA.  This will tell you the temperature rise of the Junction above the PCB or system  Ambient.

    I hope this helps.