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LTM4646 Multiphase Operation

Hi,

I'd like to confirm the number of Multiphase of LTM4646.

According to the data sheet page 11, Up to 6 phases can be cascaded to run simultaneously with respect to each other

by programming the PHASMD pin to different levels.

But on page 14, Up to of 12 phases can be cascaded to run simultaneously with respect to each other by programming the PHASMD pin of each LTM4646 channel to different levels.

Which the number is correct ? I think it is up to 6 phases.

Regards,

Hiroyuki

  • Hello Hiroyuki,

    The maximum # of phases which can be cascaded is 12. For 12-phase operation, daisy chain the CLKOUT and MODE/PLLIN pins and setup the phase mode pins as shown below:

    Module #

    Phase 1

    (degrees)

    Phase 2

    (degrees)

    CLKOUT

    (degrees)

    Phase mode pin

    1 0 180 60 GND
    2 60 240 60 GND
    3 120 300 90 FLOAT
    4 210 30 60 GND
    5 270 90 60 GND
    6 330 150 90 / 60 FLOAT / GND

    Page 11 of the data sheet will be corrected to state that up to 12-phases can be cascaded.

    Thank you,

    Mike