• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Subscribers 64 subscribers
  • Views 126 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LP8733: In the case of multiple Sitara Processor (Large current)

Satoshi
Guru 19485 points
Part Number: LP8733
Other Parts Discussed in Thread: AM2434

One of the case, If using AM2434 (Sitara) ×2 and need full performance, 0.85V of VDD_CORE and VDDR_CORE need larger than 3A and LP87334D's BUCK0 have not enough to current rating (3A_max).

When above case, is one side BUCK0 substitute to common DC/DC converter no problem? (On the premise that sequence control is match)

Or, are both side BUCK0 substitute to common DC/DC converter OK, too? (LP87334D's BUCK0 is unused)

We referenced by below application note page 10, but these are one chip solution.

https://www.ti.com/jp/lit/an/slda059/slda059.pdf

Best regards,

Satoshi

  • 0
    TI__Genius 15725 points

    Hi,

    Thank You for using E2E! Just to make sure we understand the concern, are you planning to have two AM2434 in your application and the concern is about the max current on BUCK0 not being enough to drive the CORE rails on both processors?

    Thanks,

    Brenda

  • 0 in reply to Brenda Diaz
    Guru 19485 points

    Hi Brenda

    Thank you for reply,

    Yes, your thinking is correct.

    I want to confirm any problem or not about drive the CORE rails use the other DC/DC, or LP87334D+other DC/DC on two AM2434.

    Best regards,

    Satoshi

  • +1 in reply to Satoshi
    TI__Expert 5600 points

    Hi Satoshi,

    In this case that you need to drive two AM2434 devices LP87334D + other DC/DC might be easiest. LP87334D BUCK0 is powered anyway when device is enabled so adding another DC/DC for second AM2434 should work. How about other rails? Do they have enough power for two AM2434 ti support?

    BR, Jari

  • 0 in reply to Jari Niemela13
    Guru 19485 points

    Hi Jari

    Thank you for reply,

    I understood.

    Customer's current request is two points below;

    ・Two AM2434 need to suppose full performance.

    ・Current rating of Power management IC need ×2 margin.

    Together with another rail, I think that LP87334D can't match above condition.

    I will make solution on the other DC/DC's. 

    Best regards, 

    Satoshi