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Questions on BQ51050B

Other Parts Discussed in Thread: BQ51050B, TPS61253

Dear support,

          I'm working on a new project and has some questions on battery management, as folow:

1.How could i know when the charging has finished?

2.Is it suitable for the system block shown below?

  • The bq51050B sends a charge complete signal to the TX (See table 1 in the datasheet).

    I would suggest a different interface between the bq51050B the battery and the TPS61253.  As it is now, the bq51050B and battery can both be on the bus trying to supply the TPS61253.  

    Regards,

    Dick

  • Dear Dick,
    Can you tell me more details about your suggestion on the interface between the bq5105b the battery and the tps61253?
  • Jun,

    You are okay as it is, if you have the current load understood. The concern is that if you have a low battery and the charger is operating and the system turns on, the output of the charger may collapse (to the battery voltage effectively). Depending on the voltage level, this might cause a system restart.

    Regards,

    Dick
  • thanks for your prompt answer, to avoid the scenario, i.e. system restart, i would like to choose your recommendation as using different interface between bq51050B, the battery and the TPS61253. but considering TPS61253 only has one VIN pin, how to achieve? can you draw the reference circuit. appreciate much for that.
  • Jun,

    The key to this is to make sure the load does not overpower the battery / charger system.  Do you know the load for the system?  In particular, during start-up.  Sufficient capacitance at the bq51050B outpu, at the battery output and TPS61253 input will be required.  That is specific to your load requirements.  Additionally, an under-voltage lock-out of some sort might be of use.  This would keep the load off until the battery is sufficiently charged to handle the system load.

    Dick