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BQ24253: Starting to build

Oginne Lapuz
Prodigy 20 points
Part Number: BQ24253
Other Parts Discussed in Thread: BQ25895

Hi!

I am trying to build a powerbank, and these are my specs:

  • 5 ~ 5.1V/2A output
  • Standalone(No I2C communication) - Can just apply power and run
  • Charge status
  • Battery charging @ 4.2V & >= 1.5A

My question is, is the BQ24253 what i need in order to start with? I have gone through the datasheets, and it does seem perfect for what I am trying to achieve, I just want some thoughts of some users that have experienced using this IC.

If not, can you recommend any others that fit my criteria?

Thanks in advance! 

  • 0
    TI__Guru**** 170446 points
    Hi Oginne,

    Are planning to add a separate boost converter IC to generate the 5-5.1V/2A output? In not, then you might consider the bq25895. It was designed for powerbank applications and, unlike the bq24253, it has integrated OTG boost mode. If the default settings are acceptable, then you can don't need to communicate with the bq25895 via I2C. You can reduce the default charge current of 2A by using the ILIM pin to limit charger's input current.
  • 0 in reply to Jeff F
    Prodigy 20 points
    Hi Jeff,

    I appreciate the reply. thanks for pointing out the BQ25895 as a better IC for my purpose.

    As I was looking into the WEBENCH design recommedations, 5V/3.1A power our would be at the PMID pin, correct? Looking into it more, do I need to add more components in order to get the 5V/3.1A output at the PMID pin, or I can just assemble the parts stated and I can get my result? (This is applying a signal LOW to the OTG pin of course).

    Thanks,

    Oginne
  • 0 in reply to Oginne Lapuz
    TI__Guru**** 170446 points

    Oginne,

    If you use the recommended application diagram components (including the Schottky diode from SW to PMID) in the datasheet, you should be able to reach 3.1A.  Please ensure that the resistance from the battery to the BAT pin is as low as possible so that the voltage drop created by the battery current doesn't lower the voltage at the BAT pin below the minimum operating voltage.