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BQ25185：Solar Energy Input and Power Switching Management

Xiaolin Kang
Prodigy 50 points
Part Number: BQ25185
Other Parts Discussed in Thread: BQ25616

Hello, I need to design a power management module that uses a parallel configuration of solar panels and lithium batteries for dual power supply. When solar power is sufficient, it should power the subsequent circuits and charge the lithium battery; when solar power is insufficient, the lithium battery should power the subsequent circuits. The battery is a single-cell ultra-thin lithium battery. However, the microcontroller in the subsequent circuits has a relatively high startup current of 500mA. Can the BQ25185 meet the above requirements? I haven’t found any description in the datasheet about supporting solar input. If it can meet the requirements, could you provide a similar circuit diagram? If not, are there any other chip recommendations? I look forward to your reply. Thank you.

  • 0
    TI__Mastermind 32870 points

    Hello!

    We have received your case and will take some time. Thank you for your patience.

  • 0
    TI__Mastermind 32870 points

    Hello,

    Does your customer prefer a linear charger or a switching charger? I2C-controlled or standalone (resistor-configurable)?

    The BQ25185 includes battery tracking VINDPM, a feature that makes it well-suited for solar panel inputs. Please see this application note:

    Using Battery Tracking VINDPM to Make the Most of Solar and High-Impedance Power Sources

    The battery discharge overcurrent protection (BATOCP) on the BQ25185 is 3.13A, so it can support the 500mA inrush current of the MCU.

    Best regards,

    Links

  • 0 回复 Links
    Prodigy 50 points

    Hello, thank you for your reply. I may prefer to choose a chip that does not require I2C control. Can the BQ25185 chip meet the dual-power supply requirement (even when the solar output is unstable and there is no solar input at night)? Is there a circuit schematic of this chip available for such an application? Additionally, I would also like to ask if there are other energy management chips that can meet the requirements? Looking forward to your reply.

  • 0 回复 Links
    Prodigy 50 points

    Hello, thank you for your reply. I may prefer to choose a chip that does not require I2C control. Can the BQ25185 chip meet the dual-power supply requirement (even when the solar output is unstable and there is no solar input at night)? Is there a circuit schematic of this chip available for such an application? Additionally, I would also like to ask if there are other energy management chips that can meet the requirements? Looking forward to your reply.

  • 0 回复 Xiaolin Kang
    TI__Mastermind 32870 points

    Hello,

    If I'm understanding correctly, you're asking if the BQ25185 supports having multiple input sources connected at the same time, such as a solar panel and an AC adapter? This is just something that is handled externally to the device, typically by some sort of power MUX implementation. This app note provides more details on this topic:

    Basics of Power MUX

    For a standalone buck charger, I recommend the BQ25616.

    Are there any other requirements for your system? What battery chemistry will you be using? Lithium-ion? Lithium iron phosphate?

    Best regards,

    Links

  • 0 回复 Links
    Prodigy 50 points

    Hello, and thank you for your response. The chip I am looking for needs to meet the following requirements: it should support input from a solar panel, charge a lithium battery and power the subsequent load when solar energy is sufficient, and switch to the lithium battery to power the load when solar energy is insufficient, thereby achieving the functionality of a dual power supply module.

    My question is: Can the BQ25185 chip meet the above requirements? If not, are there any other chips you could recommend? The startup current of the microcontroller in the subsequent load reaches 500mA, and many power management chips I've found cannot meet this output current requirement. I came across this chip, whose maximum load current seems to meet the requirement, but I am unsure if it fulfills the aforementioned functions. I look forward to your reply. Thank you.

  • +1 回复 Xiaolin Kang
    TI__Mastermind 32870 points

    Hello,

    Yes, the BQ25185 meets these requirements. Battery tracking VINDPM makes it great for use with solar panels, the battery overcurrent protection (BATOCP) is 3.125A, the highest available input current limit (ILIM) setting is 1.1A, and supplement mode allows the battery to discharge to supplement the input source in supplying the system load when the system load exceeds ILIM.

    Please let me know if you have any other questions about the BQ25185.