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BQ25890H: is 12V @ 3A an acceptable input current?

Eric Steimle
Expert 2290 points
Part Number: BQ25890H

We use this part in several of our products and usually let it auto-negotiate up to 12V at 1.5A.  But now I want to use USB-C PD (using a TI CC communications chip).  For that I want to go up to 12V @3A.  I know that is within the max ratings of the datasheet, but since maxcharge only goes up to 12V @1.5A, I wanted to make sure I wasn't missing a restriction.  So can I run it at 36W, 12V input at 3A?

Thank you

  • 0
    TI__Mastermind 25800 points
    Hey Eric,

    We have tested this before it is generally not recommended to try and process 36W through the charger. Even if we assume the efficiency will be around 86% at that voltage and current level, the power dissipated in the IC will be around 5W. A quick calculation using Theta_JA @ 25C_ambient will yield a 184C_junction temperature.

    This is well beyond our max temperature specification and will likely cause metallization of internal components and other undesired effects.

    As a rule of thumb, we recommend 12V/1.5A, 9V/2A, 5V/3.25A


    Regards,
    Joel H