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Product Recommendation Inquiry

MJ Jeon
Genius 5240 points
Other Parts Discussed in Thread: BQ25792, BQ24250

Hi, TI Support Team

The customer is developing an e-cigarette.

It is being developed by applying lithium iron phosphate (LiFePO4) batter.

Please recommend an applicable charger IC.

Specifications are as follows.

- Input Voltage range : 5V

- Input Current :2A

- Battery Charging Voltage Range :2.55-3.65V

- Nominal voltage : 3.2V

- Battery Charging Current :1.6A

- SW(Boost) output Voltage : 5V

- SW(Boost) output Current : 4A

Thanks.

Regards,

MJ

  • +1
    TI__Guru**** 166626 points

    Hi MJ,

    BQ25792 is the best option. It is a host controlled charger capable of providing the 5V/4A boost output.  The host can use the MUX drivers to control the output of the boosted output.

    Regards,

    Jeff  

  • 0 in reply to Jeff F
    Genius 5240 points

    Hi, Jeff

    Thank you for your answer.

    I'm sorry, but I have changed the specification and delivered it, so please recommend it again to a product that meets the spec.

    - Input Voltage range : 5V

    - Input Current :2A

    - Battery Charging Voltage Range :2.55-3.65V

    - Nominal voltage : 3.2V

    - Battery Charging Current :1.6A

    - PMID output Voltage : 5V

    - PMID output Current : 4A

    In addition, the customer is using the same battery as the first question, but is trying to apply the BQ24250 product. Is it possible to apply it?

    The components of the batteries supported are different, but please check.

    Thanks.

    Regards,

    MJ

  • 0 in reply to MJ Jeon
    TI__Guru**** 166626 points

    Hi MJ,

    The BQ24250 default charge voltage is 4.2V.  The host would have to change the charge voltage to 3.65V and either disable WD timer or write continuously to WD timer bit to prevent it from resetting. 

    In charge mode, the V(PMID) = V(VBUS) - IPMID*RDSonQ1 = 5V - 4A*60mohm = 4.76V typical.  Is that okay?  The BQ24250 does not have OTG/reverse mode and so cannot provide a regulated voltage to PMID when VBUS is not present.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Genius 5240 points

    Hi, Jeff

     Thank you for your answer.

    Can I use the BQ24250 for lithium iron phosphate batteries?

    Thanks.

    Regards,

    MJ

  • 0 in reply to MJ Jeon
    TI__Guru**** 166626 points

    HI MJ,

    yes, but as I mention above, you will have to disable charge until the host can lower VBATREG to 3.6V.

    Regards,

    Jeff

  • 0 in reply to Jeff F
    Genius 5240 points

    Hi, Jeff

    Can you recommend a product that meets the specs below?

    If the PMID output cannot be used, it is impossible to use it because there is a space limitation to use the external Boost Converter.

    Please recommend it as a product that can be used with the specifications below.

    - Input Voltage range : 5V

    - Input Current :2A

    - Battery Charging Voltage Range :2.55-3.65V

    - Nominal voltage : 3.2V

    - Battery Charging Current :1.6A

    - PMID output Voltage : 5V

    - PMID output Current : 4A

    Thanks.

    Regards,

    MJ

  • 0 in reply to MJ Jeon
    TI__Guru**** 166626 points

    HI MJ,

    BQ25792 is your best option.

    Regards,

    Jeff