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LMZ13608: Schematic design review

Danilo A.
Mastermind 27300 points
Part Number: LMZ13608

Hi Team,

Our customer would like to request a schematic design review of their application using 4pcs. of LMZ13608. Please refer to the schematic diagram below.

LMZ13608TZ_NOPB 검토 회로 (1) (1).pdf

Regards,

Danilo

  • 0
    TI__Mastermind 27300 points

    Hi Team,

    The customer would like to confirm if at 70C, the device is capable of supplying 5V/4A with ripple voltage of 16.33mv peak to peak.

    Regards,

    Danilo

  • 0 in reply to Danilo A.
    TI__Guru 50120 points

    Hi Danilo,

    I've recieved the schematic and will provide my feedback by EOD today. 

    Regards,

    Jimmy

  • 0 in reply to Jimmy Hua
    TI__Guru 50120 points

    Hi Danilo,

    It looks like the 5V output rail schematic is the same for all CH1-CH4. 

    As such the below recommendations apply to all circuits in the pdf.

    • Schematic shows capacitors are all polarized so I'd suggest adding a few ceramic on the input and output 
    • Use Equation 9 in datasheet to calculate necessary output capacitance based on transient voltage requirement.
      • Assuming 5% of 5V | 6A step | 350kHz | effective output ESR of 3mOhm the output capacitance should be around 370uF. 
    • Recommend at least one ceramic capacitor on output for low output ripple. I'd suggest following recommended values in datasheet (47uF X5R MLCC + 470uF tantalum polymer cap). Make sure both capacitors are rated for at least 16V.   
    • Recommend one ceramic capacitor on the input. Datasheet suggests 30uF MLCC on VIN. This capacitor should be rated for at least 25V. 
    • It looks like the circuit is using the tracking feature. Which circuit is the initiator circuit and which is the responder circuit? Note that for proper operation in tracking mode dictates that the soft-start time of the responder circuit rails be shorter than the initiator rail. Currently all circuits are set with the same Rtkt and Rtkb. Please refer to Section 8.2.2.5 for more details.

    Regards,

    Jimmy 

  • 0 in reply to Jimmy Hua
    TI__Mastermind 27300 points

    Hi Jimmy,

    Thank you very much for your feedback.

    Regards,

    Danilo