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TPS61288: What is the max current could be delivered by TPS61288?

Samy AKOURTAM
Prodigy 100 points
Part Number: TPS61288

Hello,

I am designing a boost converter based on TPS61288:

- input voltage: [9V to 16V]

- output voltage: 16V

While reading the datasheet I found out that switching peak current limit is 15A. 

I think I can't take this current data and say this component could give 8.4A @16V (9V*15A=135W). I didn't find any equation in the TPS61288 datasheet that could give an approximate value of maximum output current based on voltage and internal current data (or maximum power).

Thank you in advance for your support.

Best regards,

Samy

  • 0
    TI__Mastermind 40080 points

    Hi Samy,

    The peak switch current is 15A, but if we only use a 4-layer or 2-layer PCB, the maximum allowable maximum power(peak current) will be much lower because of the thermal.

    Based on the TPS61288 EVM board(4-Layer pcb), the maximum continuous output current at Vo=16V is around 4-4.5A,  which is equals to a (16*4.5W)/0.9/9=8.9A input current and around 10.68A peak inductor current.

  • 0 in reply to Helen chen
    Prodigy 100 points

    Hi Helen,

    Thank you for your explanation, it's clear.

    One more question, could you tell me how to determine this approximate value of output current at Vo=16V (4-4.5A)? Is there an equation based on number of pcb layers and information from TPS61288 datasheet (or an application note on this topic)?

    Thank you for your support.

    Best regards,

    Samy 

  • 0 in reply to Samy AKOURTAM
    TI__Mastermind 40080 points

    Hi Samy,

    Very good question.

    This is our test data based on the EVM board. We draft calculate it according to the Theta JA based on the EVM and the power loss on the IC.  Both the test value and the calculated value is hot, around 100C.

    I can share the pcb layout with you if needed.

  • 0 in reply to Helen chen
    Prodigy 100 points

    Hi Helen,

    Thank you again for your help.

    Best regards,

    Samy