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BQ24773: efficiency data

Toshiro Imi
Expert 7260 points
Part Number: BQ24773

Could you please provide 1s battery efficiency data with our customer.

Does it placed on Figure 1 to Figure 3 in the datasheet ?

best regards, 

  • 0
    TI__Genius 11850 points

    Hi Toshiro,

    Yes, you can use Figures 1 and 2 in the datasheet to estimate the efficiency when charging a battery. Figure 1 shows an input voltage of 5 V or 12 V, while Figure 2 shows an input voltage of 19 V.

    However, please note that the efficiency when charging a battery will be very slightly lower than the efficiency shown in Figures 1 and 2 because there is a BATFET between SYS and BAT. During charging, the BATFET will have a small voltage drop across it due to its Rdson. The small amount of power dissipated by the BATFET causes slightly lower efficiency and is not shown in Figures 1 and 2 in the datasheet.

    Best regards,

    Angelo

  • 0 in reply to Angelo Zhang87
    TI__Expert 7260 points

    Thank you.

    I understand that as long as external BATFET, RSR are not fixed, we do not know exact efficiency data according to your answer.

    By the way, would it be possible to let us know the external FET parts number when you tested the load efficiency posted in Figure 1 to Figure 4 as his reference.

    best regards,

  • 0 in reply to Toshiro Imi
    TI__Mastermind 25800 points

    Hey Toshiro,

    Please refer to the BQ24773EVM User Guide for a complete list of components used for testing the efficiency, including Power Stage MOSFETs, inductor, and sensing resistors.

    Regards,

    Joel H

  • 0 in reply to Angelo Zhang87
    TI__Expert 7260 points

    Thank you very much. This resolved our issue.

    best regards,