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BQ25180: Parallel connections of two BQ25180

Danilo A.
Mastermind 26850 points
Part Number: BQ25180
Other Parts Discussed in Thread: LM66100

Hi Team,

Our customer would like to connect two BQ25180 in parallel as shown in the schematic diagram below.

According to our customer,

I currently use BQ25180 for 1 cell battery charging for medical application. Due to performance optimisation & size consideration, we need to use 2 battery to get 2 * capacity and a 5V output. Our problem is to use 2 different battery as we need hotswap of the battery. Is it possible to plug two BQ in // according to this schematics? or have you any suggestion of component to do that?

It seems that ORing devices such as two LM66100 are needed in this application to protect the BQ25180 from reverse voltage. Can you please confirm?

Regards,

Danilo 

  • 0
    TI__Mastermind 23220 points

    Hi Danilo,

    A question on the application, will the SYS load need to be powered by the combined input? Each BQ25180 will be able to supply about 1A from the input and that goes to the charging the battery and to the load.

    If the combined supply is needed, I would recommend having diodes or perhaps a power MUX depending on the application. The diode would help avoid the concern of SYS flowing from one device to the BAT of the other. 

    Is there a strong desire to use the BQ25180 instead of a switching charger that would possibly help with the needed current consumption? 

    Best Regards,

    Anthony Pham

  • 0 in reply to Anthony P Pham
    TI__Mastermind 26850 points

    Hi Anthony,

    Thank you for your response. Here is the feedback of our customer.

    Hello, thank you for the answer.
    We don't especially need BQ25180 reference, but here are the needed configuration :
    - 5v output, 1A max
    - few additional component, preferably small size
    - maximize battery capacity by putting in // (but maybe there are better configuration)
    - have 2 separate battery

    And in option
    - gauge meter by i2c
    - TS measurement
    - start /stop button
    - 2 IC (because battery will be in 2 different position)

    If switching charger is the best solution, have you any reference for that?

    Regards,

    Danilo

  • 0 in reply to Danilo A.
    TI__Mastermind 23220 points

    Hi Danilo,

    If 1A max is all that is needed, the BQ25180 should be fine. The gauge by i2c is not possible with the BQ25180. 

    Let me look at some switching chargers and see if there are any possible solutions. 

    Best Regards,

    Anthony Pham

  • +1 in reply to Danilo A.
    TI__Mastermind 23220 points

    Hey Dan,

    Sorry for the delay, I'm not too sure on the application but if it's two separate batteries and there is also a space constraint, the BQ25180 is most likely the best solution right now.

    Best Regards,

    Anthony Pham