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BQ25606: Charge Efficiency 65%

Vincent LINTILHAC
Prodigy 70 points
Part Number: BQ25606

Hello,

I am using a BQ25606 for charging a 5000mAh LiPo battery and the charging efficiency is pretty low, around 65% with I_chg = 1.9A. I have similar results with the EVM.

What should I check to improve the charging efficiency?

Best,

Vincent

  • 0
    TI__Mastermind 31990 points

    Hi Vincent, 

    According to datasheet figure 8-1 on page 14 you should see charge efficiency in the range of 90% with ICHG = 1.9A.

    How are you measuring the input power and output power? When using the EVM please insure you are taking voltage measurements at the VBUS and BAT test points not at your input source and battery terminal. Taking measurements too far away from the IC will include loss not related to the IC in your measurement. 

    Regards,

    Garrett

  • 0 in reply to Garrett Kreger
    Prodigy 70 points

    Hi Garrett,

    I discovered that the protection circuit on the battery was causing some performance issue.

    Is there any need for external protection circuit with the BQ25606?

    Best,

    Vincent

  • 0 in reply to Vincent LINTILHAC
    TI__Mastermind 31990 points

    Hi Vincent, 

    While the BQ25606 has various protection features built into the device, we still recommend the use of an external protection circuit to ensure safe charging and discharging of the battery.

    A simple example is the BQ25606 has a built in battery over discharge protection which turns of Q4 BATFET when VBAT falls below Vbat_dpl threshold. The battery manufacturer may specify the need to stop discharging at a higher voltage than the integrated protection on the BQ25606. For this case external protection is required.  

    For your reference the datasheet summarizes the various protections built into the BQ25606 beginning on page 23. 

    Best Regards,

    Garrett