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BQ24195: Is there an IC Like the BQ24195, but Puts Out 3.3V for the Load?

Jim Newton11
Prodigy 30 points
Part Number: BQ24195
Other Parts Discussed in Thread: BQ25713

Hello...

I recently found the cool BQ24195 IC, but it seems to be designed to charge a single-cell Li-Po battery, take in USB power, and power a 5V load.  Makes sense.

Is there a version of the BQ24195 family of ICs, or a very similar IC, that charges a single-cell Li-Po battery, takes in USB power, but provides a 3.3V output for the load?

Or do I need to simply use an LDO or buck IC to go from the 5V down to 3.3V?

Thank you!

  • 0
    TI__Mastermind 25800 points
    Hey Jim,

    You second answer will be the best solution for this. Chargers like the BQ24195 have an NVDC architecture. This will buck down the input voltage to a minimum value at the SYS output, but will also force the output voltage to track with the battery, maintaining a narrow voltage between the battery and system voltage. The 5V output on the BQ24195 is given at the input pin of the charger, either through a 5V source at the input, or when no input is attached, through the reverse boost OTG mode. Here, the 5V is generated from the battery as the converter is operated in reverse.

    We do have a buck/boost controller which may be overkill for your device, but feel free to check it out - BQ25713. This has a more programmable OTG mode but there are limitations in both the OTG mode voltage range and the battery voltage range.


    Regards,
    Joel H