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TPS61088: About ensure the maximum output power

Tsukui Yusuke
Guru 21930 points
Part Number: TPS61088

Hi,

Customer want to increase the output power as much as possible.
However, a large PCB layout cannot be secured due to the area of the application.
Do you have a design example using a heat sink or a heat dissipation sheet?

Best Regards,
Yusuke

  • 0
    TI__Mastermind 40080 points

    Dear Yusuke-San,

    To our knowledge, very few customer use heatsink.

    What is your output power? Vin, Vo, and Io? Then we can give some suggestion based on your usage.

  • 0 in reply to Helen chen
    Guru 21930 points

    Helen-san,

    Thank you for your response.

    Condition is :
    Vin=3.0V to 4.2V
    Vout=5V
    Iout=4.5A / 20sec～30sec ※peak current 

    1. Customers are considering heat sinks to further increase output power.
    　Do you have a design example using a heat sink or a heat dissipation sheet?

    2. During peak current output, device junction temperature is below 125 °C to 149 °C.
        Application is such a temperature condition only during the peak current.
    　Will the life of the device be shortened if this operation is repeated?
        
    Best Regards,
    Yusuke

  • 0 in reply to Tsukui Yusuke
    TI__Mastermind 40080 points

    Hi Yusuke-San,

    Iout=4.5A / 20sec～30sec ※peak current is just the maximum output capability of TPS61088.

    If you use a 4-layer board or 6-layer board, pour a big GND copper plane for the IC, like what the TPS61088EVM do, then it should be OK.

    If this is an important customer, let's discuss by email. Thanks!

  • 0 in reply to Helen chen
    Guru 21930 points

    Helen-san,

    Thank you for your kind support.
    For heatsinks, please let me know by email based on the customer's layout and schematic.

    Could you give us your opinion on:

    2. During peak current output, device junction temperature is below 125 °C to 149 °C.
        Application is such a temperature condition only during the peak current.
    　Will the life of the device be shortened if this operation is repeated?

    Best Regards,
    Yusuke

  • 0 in reply to Tsukui Yusuke
    TI__Mastermind 40080 points

    Hi Yusuke-San,

    If the layout is good. The maximum Tc will not exceed 90C.

  • 0 in reply to Helen chen
    Guru 21930 points

    Helen chen,

    Thank you for your response.
    "If the layout is good. The maximum Tc will not exceed 90C."

    It might be just as you say.
    However, customer application is small.

    Therefore, Tj is about 150℃＠30sec.
    And Repeat the above operation.
    Does TPS61088 deteriorate if the temperature is below 150℃?



    Best Regards,
    Yusuke

  • 0 in reply to Tsukui Yusuke
    TI__Mastermind 40080 points

    Do u mean they already made the board and have tested the board?