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BQ25750: Request for Calculation sheet

Jeevabharathi R
Prodigy 100 points
Part Number: BQ25750

Tool/software:

Hi Team,

We are planning to use BQ25750 battery charger IC in our design. Can you please share if any calculation sheet available for this battery charger IC?

Thanks

  • 0
    TI__Mastermind 28925 points

    Hello Jeevabharathi,

    Yes, we do have a design calculator for this IC: www.ti.com/.../

    We also have an FAQ for this IC as well: e2e.ti.com/.../faq-bq2575x-faq-page

    Let me know if you have any questions about this.

    Best Regards,
    Ethan Galloway

  • 0
    Prodigy 100 points

    Hi Ethan, 

    Can you please confirm, Is it necessary to use only this 103AT-2 NTC to achive the cool and warm temperature threshold limit for BQ25750?

    In our battery pack have 10K NTC with the B = 3435K 

    We need to configure the charging profile to the below value

    20% Ichg at T1 - T2 ( 0C to 15 C),

    100% Ichg at (15C- 50C)

    40% at T3 - T5 (50 - 60C )

    above T5 (60C) charge suspend.

  • 0
    Prodigy 100 points

    Hi Ethan, 

    Can you please confirm, Is it necessary to use only this 103AT-2 NTC to achive the cool and warm temperature threshold limit for BQ25750?

    In our battery pack have 10K NTC with the B = 3435K 

    We need to configure the charging profile to the below value

    20% Ichg at T1 - T2 ( 0C to 15 C),

    100% Ichg at (15C- 50C)

    40% at T3 - T5 (50 - 60C )

    above T5 (60C) charge suspend.

  • 0
    Prodigy 100 points

    Hi Ethan, 

    Can you please confirm, Is it necessary to use only this 103AT-2 NTC to achive the cool and warm temperature threshold limit for BQ25750?

    In our battery pack have 10K NTC with the B = 3435K 

    We need to configure the charging profile to the below value

    20% Ichg at T1 - T2 ( 0C to 15 C),

    100% Ichg at (15C- 50C)

    40% at T3 - T5 (50 - 60C )

    above T5 (60C) charge suspend.

  • 0 in reply to Jeevabharathi R
    TI__Mastermind 28925 points

    Hello Jeevabharathi,

    Jeevabharathi R said:
    Can you please confirm, Is it necessary to use only this 103AT-2 NTC to achive the cool and warm temperature threshold limit for BQ25750?

    It is possible to use different temperature sense resistor. The sense resistor you have has the same B and resistance as the 103AT-2 NTC.

    You can use the design calculator to get the recommended values for the top and bottom resistors.

    Best Regards,
    Ethan Galloway

  • 0 in reply to Ethan Galloway
    Prodigy 100 points

    Ethan

    Thank you for your information.

    We are planning to use the internal ADC of BQ25750 to monitoring input power. Could you please provide information regarding the accuracy of the internal ADC in measuring the input current and the voltage?

  • 0 in reply to Jeevabharathi R
    TI__Mastermind 28925 points

    Hello Jeevabharathi,

    Your welcome.

    The ADC of the BQ25750 is intended for use as a general indicator. Please keep in mind that we don't provide a datasheet specification of the accuracy for the ADCs. Here's an FAQ that goes into more detail on how to use the ADC.

    Here's the IAC ADC accuracy that was measured:

    Here's the VAC ADC accuracy that was measured:

    Also, the accuracy of the IAC ADC should be improved by going to a larger 10mΩ input sense resistor.

    Best Regards,
    Ethan Galloway