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TPS650250EVM-447: Powering AM3358 with TPS650250EVM

Jack
Mastermind 9165 points
Part Number: TPS650250EVM-447
Other Parts Discussed in Thread: AM3358, TPS650250, TPS65217

Hi Champs

There's an issue that customer faces.

Although their AM3358 board with TPS65217x worked fine. Boot Failure is reproducible when replaced with TPS650250 after removed TPS65217x.

Please check if the waveform is normal. See their attachment.

TPS650250 Test (002)_Intellian.pptx

It seems LDO1, LDO2, DCDC2, DCDC3, DCDC1, PWRONRSTn  Ramping Up sequence looks ok.

Could you please let us know what should be checked in addition to ramping up sequence?

Thanks.

Regards, 

Jack 

  • 0
    TI__Genius 13216 points

    Hi Jack,

    Thank you for the question. Our TPS650250 expert is Out of Office until next week due to the U.S. Thanksgiving Holiday. Please expect a reply next week when they return.

    Thanks,

    Daniel W

  • 0 in reply to Daniel W
    Mastermind 9165 points

    Hi Daniel.

    Thanks for your kind reply.

    Please let us know if TPS650250 is applicable to AM3358-1GHz device. According to PMIC selection guide, It supports 300, 600 Mhz devices.

    Customer could not see any UART output "cccccc" in UART boot mode also.

    Thanks.

    Regards, 

    Jack

  • 0 in reply to Jack
    TI__Mastermind 22761 points

    Hi Jack,

    Thanks for posting your question on E2E! Due to the U.S. Thanksgiving holidays, please expect delayed responses. I will review the information and provide an update early next week. 

    Thanks,

    Brenda

  • 0 in reply to Brenda Diaz
    TI__Mastermind 22761 points

    Hi Daniel,

    Just to make sure I understand the information in your original post, the customer had an existing application with TPS65217 powering the AM335x processor and it was re-designed to use TPS650250 PMIC instead? Is this understanding correct?

    Jack said:
    Could you please let us know what should be checked in addition to ramping up sequence?

    For any new design, or re-design we recommend reviewing multiple things like the schematic, layout, output voltages, sequence, etc.

    As stated in the AM335x PMIC Selection Guide, "the TPS650250 device can power the AM335x family of processors supporting 300 and 600 MHz frequencies". I would recommend reviewing the power consumption for the different OPPs and frequencies to make sure the PMIC rails can support the voltage requirement as well as the worst case current ratings for the AM335x variant.    

    Additionally, I would also recommend reviewing Powering the AM335x With the TPS650250 (Rev. B) where you can find more information including the block diagram matching the PMIC rails with the processor and the power-up waveforms starting on page 5.

    Thanks,

    Brenda