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BQ25606: BQ25606

Soumya
Prodigy 655 points
Part Number: BQ25606

Hi, 


Can you please help with one of my customer's inquiry below?

I quickly need to understand something that seems vague in the datasheet.

If I am using an external power source in the path you see below, does it always use the internal buck converter to supply power?

Does it supply power from VBUS thru the switcher as shown or thru the SYS output?         

I think it uses the switcher but I don't see efficiencies of the switcher except for feeding the battery. 

Referring to section 7.7 Typical characteristics and 9.2 Typical application diagram.

 

 

  • 0
    TI__Mastermind 25800 points

    Hey Soumya,

    Figure 1 is the efficiency of charging the battery through the integrated buck converter. The curves are with VBUS = 5V, 9V, and 12V.

    If you look at Figure 15 by itself, you would see the entire picture. Please review the section 8.2 Functional Block Diagram to get a better understanding. To provide charge current, power from VBUS is extracted through the buck converter to the SYS output, which in-turn, provides that current through the integrated BATFET to drive the charging current. 

    In other words, SYS is the true out of the buck converter, and the path to charge the battery is from SYS to BAT.

    The Figure 1 efficiency includes the BATFET loss.


    Regards,

    Joel H

  • 0 in reply to Joel Hernandez II
    TI__Prodigy 655 points

    Hi Joel,

    Here's customer feedback-

    Sorry I reread what you sent.

    I understand the path to charge the battery.  That is clear in the documentation.  That was not my question.

    I will try to restate it but please after reading below please relook at my first email.

    What I am unclear about is the following.

    The battery charger IC gives you the alternative of powering running a product off an external power source through VBUS in

    addition to running a product off the battery or a combination of both.

    What I want to know is if I am operating this product on VBUS only (like my picture), is the voltage on VBUS going through

    the buck converter to supply power to the product or is there a path where the buck converter isn't running and VBUS passes

    straight through.

  • 0 in reply to Soumya
    TI__Mastermind 25800 points

    Hey Soumya,

    Understood. With VBUS present, VBus going through the buck converter to regulate VSYS. There is no path where VBUS goes straight to VSYS.

    Regards,

    Joel H