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AM2432: power-supply

Isee
Expert 6550 points
Part Number: AM2432

In the reference designs (PROC101C, PROC109A) there are used high accuracy voltage regulators with 1% feedback. According to the datasheet there is needed a +/-4,5% accuracy for VDD_CORE.

1% accuracy of the regulators may already offer enough reserve in tolerance. Is this high accuracy required? Are there any experiences or problems known if the accuracy is not this high -> maybe regulator with 2,5/3% accuracy in Feedback.

Is there any requirement for the use of an LDO for VDD_1V8 -> I would prefer to use the same regulator as for 3V3 and 0V85 (TPS62822DLC) 

Regards

Andreas

  • 0
    TI__Mastermind 22685 points

    Hi Andreas,

    The tolerances on power supply rails in the Recommended Operating Conditions section of the device datasheet are inclusive of both DC margin (i.e. power supply accuracy) and AC noise/ripple and should be consider to be the maximum allowed for the combination of both.  So having a more accurate voltage regulator (1% versus 2.5/3%) means you can allow for more AC noise/ripple on the power supplies without running the device out of spec.  This is not a concern as long as you can ensure your design does not have so much AC noise/ripple that it could possibly put the voltage rail out of the Recommended Operating Condition spec.

    There is no requirement for LDOs versus other types of voltage regulators.  As long as the ROC is met, there is no concern.

    Thanks,
    Mike