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[FAQ] AM625: PMIC + FET to control 1.8 VPP

Alisa Thomas
Prodigy 440 points
Part Number: AM625

Hi, my customer has a question about using an output from the TPS6593 PMIC + a FET to control ON/OFF for 1.8V VPP on the processor? They are trying to see if they can get by without using a dedicated LDO for 1.8V VPP.

  • +1
    TI__Guru 63125 points

    It is very important for the AM62x VPP pin to remain in the Recommended Operating Condition (ROC) voltage range during efuse programming.

    The VPP pin will have high current transients which can be problematic when trying to use a FET to source this pin from a fixed 1.8V supply.  We recommend an LDO powered from a higher voltage supply because the LDO will be able to compensate for the voltage drop through its series pass transistor and maintain the correct operating voltage during the high current transients. Local bulk capacitors are likely needed near the VPP pin to assist the LDO transient response. We recommend customers characterize their specific VPP implementation and update their circuit design as necessary to ensure the AM62x VPP pin never drops below the min ROC value.

    Regards,
    Paul

  • 0 in reply to peaves
    TI__Prodigy 440 points

    Thank you Paul! I will convey this to the customer