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Original question:

AM2434: AM2434BSDGHIALVR

[FAQ] Power supply design with minimal space AM2431

Melbin Manuel
Prodigy 60 points
Other Parts Discussed in Thread: AM2431, TPS65219

Hello,

We are planning to design an Ethernet card using the AM2431 MCU.

From the initial power analysis, the below voltage rails are required for the MCU and peripherals. 

Since we have a size constraint, the normal DC-DC regulator approach is consuming much area of the PCB due to the Inductor and other discretes.

We would like to explore different options available with TI power products (inductor-less is more feasible) to overcome the size constraint.

  • 3.3V, 661mA​
  • 0.85V, 1.456A​
  • 1.8V, 130mA​
  • 1.1V, 350mA​
  • 2.5V, 235mA

Thanks in advance,

Melbin

  • +1
    TI__Intellectual 2101 points

    Hey Melbin,

    we have an application note that explains different PMIC solutions for powering the AM243x.

    For your application, the TPS65219 will also work. 

    Requirement Power Rail
    3.3@661mA BUCK2
    0.85V @ 1.456A BUCK3
    1.8V@130mA LDO3
    1.1V@350mA LDO1
    2.5V @ 235mA LDO2

    If the inductors still prove to be too big for your solution, TI also has a library of Buck modules which feature an integrated inductor, but this approach typically comes at a cost of height.

    Best,

    David Martinez

  • 0 in reply to David Martinez
    Prodigy 60 points

    Hi David,

    Thanks for the quick reply. We have gone through the datasheet of TPS65219. It is said that "Nominal output voltage is configured in EEPROM"

    Also from an application note, it is providing only preset voltages from each variants of TPS65219. 

    Could you please guide me how I can get voltages as per the below requirements.

    Buck 1 - 0.85V

    Buck 2 - 3.3V

    Buck 3 - Not used

    LDO1 - 1.8V

    LDO2 - Not used

    LDO 3 - 1.1V

    LDO4 - 2.5V

    Thanks,

    Melbin

  • +1 in reply to Melbin Manuel
    TI__Intellectual 2101 points

    Hey Melbin,

    1) the TPS65219x supports user-programmable EEPROM using the USER_NVM_CMD_REG register to change the default voltages and other NVM settings such as sequencing.

    2) To request a new custom NVM, your request would need to be submitted to our marketing team for review.

    3) What package size of the AM2431 are you using? If you are using ALV, I agree TPS65219 would be a good fit. If you are using ALX, page 9 of the application note I included covers an application with similar rail voltages to yours.

    best,

    David Martinez