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BQ24297: versus BQ24295: Wchich are the significant differences ?

kellerman
Prodigy 50 points
Part Number: BQ24297
Other Parts Discussed in Thread: BQ24295,

Comparing both parts,  I see little differences between both parts. BQ 24297 shows a dedicated 5V output at PMID-pin, this pin seem 'unused' (except the cap)   in  bq24295 designs.

bq24295 has a focus using SYS as an output, BQ24297 - sys -pin has similar properties but in the application not used as an output.

From my point of view, BQ24297 could replace the BQ24295 from a viewpoint on  function  level ( not ipin to pin...) . Is this statement correct?

  • 0
    TI__Mastermind 25800 points
    Hey kellerman,

    The BQ24295 was build for Powerbank type applications. Here, the charger output is only through the PMID pin to effectively create an isolated OTG voltage rail of ~5V. This is done by disabling the reverse blocking FET on the charger (Q1, RBFET).

    On the BQ24297, the Q1 FET is not disabled in OTG mode (boost mode) and thus, VBUS and PMID is shorted together internally. For powerbank applications, this is not ideal because end users have open access to the typical micro-USB female connector that can be shorted. There is typically a separate USB Type-A female connector used for the OTG function of charging an external device.


    Regards,
    Joel H