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Original question:

LP8733: LP87334DRHDR

LP8733: LP87334DRHDR

Aravinth D
Prodigy 25 points
Part Number: LP8733
Other Parts Discussed in Thread: AM2432

Tool/software:

Hi,

For my custom board am using AM2432 ALX package, to powering the sitara am using PMIC IC (LP87334DRHDR).

I am not getting the PMIC outputs of Buck regulators and LDO's. Used the factory programmed PMIC IC variant (LP87334DRHDR). Are there any specific instruction needs to be followed for this variant. 

I have given 5V input supply and I am getting proper input on the PMIC input lines. 

EN pin used 10KOhm pulled high voltage source of 3.3V and am not using any host MCU to trigger PMIC Enable pin. 

Thanks 

Aravinth

  • 0
    TI__Genius 10007 points

    Hi Aravinth, 

    There are no other specific startup instructions for this variant.
    For the LP87334DRHDR, the internal bits for the enables are already set, so only the external EN pin should be needed to pull high in order to enable the bucks and LDOs. 

    Can you clarify what you are seeing for the output? Are you getting no output at all, or lower than expected output?

    And are you able to send your schematic so I can see if there are any issues there?

    Best Regards, 
    Sarah

  • 0 in reply to Sarah Lao
    Prodigy 25 points

    Hi Sarah Lao,

    Thanks for the reply,

    I am getting output voltage of 14mV on Buck regulator and LDO's.

    I have connected the EN pin pull up to voltage source of 3.3V.

    Sure, I am attaching the schematic. Please check and update.

  • 0 in reply to Aravinth D
    TI__Genius 10007 points

    HI Aravinth, 

    Thank you for sharing, I do not spot any issues with the schematic. 

    1. Are you able to share a scope capture of the VIN_PMIC, VSYS_3V3, and at least one of the buck/LDO output signals?

    2. Are you able to use VIN_PMIC as the power source for the EN pin, instead of VSYS_3V3 and see if this has a different outcome?

    Thank you, 
    Sarah