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Battery backup solution

chentsu chung
Mastermind 6180 points
Other Parts Discussed in Thread: BQ25606, BQ25601, BQ25713

Hi,

Here is a battery backup request from customer:

Input: 12VDC

Battery: 18650 Li-ion Battery single cell or muti-cell (based on TI solution)

Need solution include battery charger (charging current at least 0.5A) and DC/DC converter for 1A or 2A output (buck or boost, could be series cell based on TI solution)

Please help to check that TI has solution or not, thank you.

C.T.

  • 0
    TI__Guru**** 166626 points
    Hi Chentsu,

    Does the customer have a host processor, software support and I2C communication or do they need a standalone charge solution?

    Regards,
    Jeff
  • 0 in reply to Jeff F
    Mastermind 6180 points

    Hi Jeff,

    Could you help to suggest solution for both for our reference(standalone and I2C or PMBus)?

    Thank you very much!

    C.T.

  • 0 in reply to chentsu chung
    TI__Guru**** 166626 points
    Hi C.T.,

    For 1S solution from 12V input source, BQ25601 has I2C controlled integrated buck converter, providing a minimum system rail, and power path for charging a battery. BQ25606 is the standalone version.

    For 2-4S solution from 12V input source, BQ25713 I2C controlled charge buck/boost controller (meaning external FETs) also provides a minimum system rail and powerath for charging a battery.

    In both cases when there is no input voltage or if the system load is too large for the converter, the battery supplements the system load.

    If the 18650 cell does not have a protector, I suggest searching for a battery protector at www.ti.com/.../overview.html.

    Regards,
    Jeff
  • 0 in reply to Jeff F
    Mastermind 6180 points

    Hi Jeff,

    Sorry the information is not enough for you.

    The system is:

    12Vinput to system and battery-> battery chargr for 4.2V(8.4V) battery -> if 12V adapter remove, boost battery voltage to 12V for system.

    So if there any solution could replace battery charger+boost converter ?

    Thank you.

    C.T.

  • 0 in reply to chentsu chung
    TI__Guru**** 166626 points
    Hi C.T.,

    The BQ25713 can charge from a 12V input source (connected to your system) to a 4.2V -8.4V battery and then, after a delay, operate in OTG mode where it boosts back 12V to its input. If your system can handle the delay or if you can provide a large enough capacitor to hold up the system at 12V or if your system can briefly operate at the battery voltage, the BQ25713 should work for you.

    Regards,
    Jeff
  • 0 in reply to Jeff F
    Mastermind 6180 points

    Hi Jeff,

    Understand, thank your very much!

    C.T.