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TPS552872: TPS552872 Module: Technical Questions

İrem Nur BAYRAKTAR
Prodigy 45 points
Part Number: TPS552872
Other Parts Discussed in Thread: , TPS552892

Tool/software:

Dear Team,

We are currently in the process of designing a board that requires a power supply with a wide input voltage range. The primary power source will be an external battery, typically providing 5V, but with potential fluctuations down to 3.8V. The board may also be powered by an external source up to 36V. Our requirement is to maintain a stable 5V output from these variable inputs. We are considering the TPS552872 buck-boost converter for this application and have a few technical questions: 

  • Low-Input Performance: Can the TPS552872 reliably provide a stable 5V output when the input voltage drops to 3.8V, operating in boost mode?

  • EMI/EMC Mitigation: Since this is a non-isolated module, what are the best practices for board layout and component selection to minimize EMI/EMC issues?

  • PGND vs. AGND: Is it advisable to separate the power ground (PGND) and analog ground (AGND) planes for EMI? If so, what are the recommended layout techniques to prevent potential noise issues from this separation?

  • Reverse Voltage Protection: If a negative voltage (e.g., -36V) were accidentally applied to the input, does the component have built-in reverse voltage protection? If so, how does it provide this protection?

Also, can you share the altium project of the TPS552872EVM.

Thank you for your guidance.

  • 0
    TI__Genius 16650 points

    Hi,

    Thank you for reaching out. Below is my feedback:

    İrem Nur BAYRAKTAR said:
    Low-Input Performance: Can the TPS552872 reliably provide a stable 5V output when the input voltage drops to 3.8V, operating in boost mode?

    May I know the output current?

    İrem Nur BAYRAKTAR said:

    • EMI/EMC Mitigation: Since this is a non-isolated module, what are the best practices for board layout and component selection to minimize EMI/EMC issues?

    • PGND vs. AGND: Is it advisable to separate the power ground (PGND) and analog ground (AGND) planes for EMI? If so, what are the recommended layout techniques to prevent potential noise issues from this separation?

    Please refer to layout guideline.3125.TPS55289 Layout Guideline.pdf

    İrem Nur BAYRAKTAR said:
    Reverse Voltage Protection: If a negative voltage (e.g., -36V) were accidentally applied to the input, does the component have built-in reverse voltage protection? If so, how does it provide this protection?

    TPS552872 doesn't have reverse voltage protection. External circuit is needed.

    İrem Nur BAYRAKTAR said:
    Also, can you share the altium project of the TPS552872EVM.

    You can send me a friendship request. I will send to you by message.

    Regards,

    Mulin

  • 0 in reply to Mulin Yuan
    Prodigy 45 points

    Hello Mulin,

    Thank you for your response.

    Regarding the output current, the peak current is 3A at startup about 20ms but the typical steady-state current consumption is 0.5A.

    I have sent a friendship request as you suggested and look forward to receiving the Altium project file for the TPS552872EVM.

    Best regards

  • 0 in reply to İrem Nur BAYRAKTAR
    TI__Genius 16650 points

    Hi, 

    With 5V/3A load, Iin will reach 5*3/0.9/3.8=4.4A. TPS552872 has 3.3A minimum average current limit. Recommend to use TPS552892.

    Regards,

    Mulin