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TPSM8A28: Schematic review

JH Shin
Mastermind 8685 points
Part Number: TPSM8A28

Hello,

My customer requested TI's review of the TPSM8A28RDGR design.

Could you please review the following circuit for any problems?

TPSM8A28RDGR.pdf

Thank you.

JH

  • 0
    TI__Mastermind 30780 points

    Hello,

     

    Here are my comments on the SCH:

    • VCC should not go above 6V abs max, otherwise the device will be damaged. If you spike at the input, it will stress the VCC pin
    • The same comment applies for PGOOD, abs max is 6V.
    • I not know your max current, please set the R_TRIP accordingly and makes the inductor is not going to saturate. Use equation 5 from the datasheet to set that up for each unit as they all have different VOUT .
    • VSNS short to AGND for a single-end sense configuration on unit 28 and 29.
    • Vout = 0.5x(Rtop/Rbot+1). I see this equation in you SCH. it is wrong. the reference is 600mV. your feedback settings are correct on U28 and U 25 and wrong on U29.
    • Add CFF footprint in case it will be needed
    • I am not sure the VOUT ripple requirement, and the Under/overshoot requirement during transient, you may need to double check the COUT for each unit. keep the ESR low as well. 

    Thanks!

    Tahar