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LMZ31704: Request a Design Review

Louis Han15
Genius 4680 points
Part Number: LMZ31704

Hello

Could you design review the attached schematic file?

Refer the Design specification below

VIN : 5V

VOUT : 0.7V, 1V, 2V, 3.3V, 3.6V

IOUT : 4A

LMZ31704.pdf

Best Regards.

  • 0
    TI__Genius 17905 points

    Hi Louis,

    Some common feedback for all rails:

    1) Please do not populate resistors to connect AGND to PGND. Per datasheet p.7, a single connection is made internal to the device so it is not recommended to connect these on your PCB

    2) I would not recommend having no programmed soft-start at all (leaving STSEL floating and SS/TR floating). Connect STSEL to AGND to enable the internally-set soft start of ~1.2ms. I would also recommend including a placeholder for a small soft start capacitor on SS/TR pin to AGND be able to adjust the soft start time, unless you have already checked (for example, on an evaluation board or other prototypeand are happy with startup with just the built-in 1.2ms soft start.