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BQ25170: Is it okay to add diodes between battery and OUT pin?

Chase Jeong
Genius 5530 points
Part Number: BQ25170
Other Parts Discussed in Thread: BQ24085, BQ24018,

Tool/software:

Dear TI experts,

My customer uses BQ24085 and 3 diodes for their existing product.

They referred the E2E thread below. The reason why adding diods is same, for explosion-proof standards.

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/984747/bq24064-about-bat-pin

Now they check other battery charger ICs which have higher battery regulation voltage than BQ24085.

First they looked BQ24018, but it was released 2002, last revision was 2014. I think it is old device.

TI.com recommends BQ25170 instead of BQ24018, because BQ25170 is newer device.

But BQ25170 does not have BAT pin (battery voltage sense input). So I have a question, BQ25170 can work as similar as BQ24018 with adding 3 diodes.

Could you check the possibility of BQ25170 with 3 diodes, Can it charge the pattery properly or not?

Or you can suggest other charger IC which is fit to my customer.

My customer is looknig for linear charger IC with higher battery charging voltage than 4.2V.

Please check this issue .Thanks.

Best regards,

Chase

  • +1
    TI__Guru 70056 points

    Hi Chase

    The newer linear chargers (BQ2517X) do not have BAT pin, this option was common on older devices.

    BQ25170 would not work well with diodes in the output, forward voltage drop will cause error in charge voltage and other problems.

  • 0 in reply to Bill Johns
    Genius 5530 points

    Dear Bill,

    Thank you for your support.

    I understand that BQ2517x do not have BAT(battery voltage sense input), so it will cause error.

    How about BQ24018? Do you think that it would be fine with BQ24018 and 3 diodes like the thread above? Does it have a plan going to EOL?

    Please check this issue. Thanks.

    Best regards,

    Chase

  • +1 in reply to Chase Jeong
    TI__Guru 70056 points

    Hi Chase 

    Chase Jeong said:
    Does it have a plan going to EOL?

    Unit will not go EOL if it has orders, see policy here.

    The BQ24018 (4.36V) may work, and customer will need to evaluate the device in the circuit with battery and diodes.