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BQ24773: What kind of design requirements will need BQ24773?

Alan Xiao30
Prodigy 20 points
Part Number: BQ24773
Other Parts Discussed in Thread: BQ24780S, BQ25713, BQ25708, BQ24770

Dear sir/madam,

I found the following recommended chips in the charger products on the page of standard laptop.

BQ24780S BQ25713 BQ25700A BQ25708 BQ24773 BQ25713B

At my first sight, I wanna use BQ24773. However, the selection between these 6 chips are hard to figure out due to various features.

If there is any comparison table of these 6 chips (especially in kinda practical application), it would be much easier for my selection.

ex. What kind of design requirements will need BQ24773?

Thanks a lot!


Regards,
Alan X

  • 0
    TI__Genius 11850 points

    Hi Alan,

    Thanks for your question. The devices that you listed are all 1-4 cell battery chargers that are suitable for notebook applications. I'll try to summarize the differences in this post, but feel free to ask follow-up questions if you need further clarification.

    The BQ247xx family are buck chargers, meaning the adapter must be at a higher voltage than the battery in order for charging to occur. One of the key differences between the BQ24773 and the BQ24780S is that the BQ24773 uses an NVDC topology, while the BQ24780S uses a hybrid topology. This blog post provides some more information regarding these charger topologies:

    https://e2e.ti.com/blogs_/archives/b/fullycharged/archive/2016/09/19/understanding-battery-charger-features-and-charging-topologies

    The BQ257xx family are buck-boost chargers, meaning the adapter can be either above or below the battery voltage for charging to occur. The BQ2571x chargers are updated versions of the BQ2570x chargers, but they are pin-to-pin and software compatible. The BQ25713 datasheet includes a device comparison table that summarizes the differences within the BQ257xx family:

    Here are a few questions to help guide your decision:

    1) Do you need a buck charger or a buck-boost charger? If you need buck-boost mode, then you will need a BQ257xx charger. If you only need buck mode, then both charger families (BQ247xx and BQ257xx) will be fine.

    2) Do you need OTG mode? If so, then you will need a BQ257x0 or BQ257x3 charger.

    3) Do you prefer I2C or SMBus communication? The BQ24773 and BQ257x3 chargers use I2C, while the BQ24770, BQ24780S, BQ257x0, and BQ25708 chargers use SMBus.

    Best regards,

    Angelo