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BQ25618EVM: Inconsistent charging current of BQ25618EVM

Danilo A.
Mastermind 26350 points
Part Number: BQ25618EVM
Other Parts Discussed in Thread: BQSTUDIO, EV2400, BQ25618

Hi Team,

We received an inquiry from a customer about Inconsistent charging current of BQ25618EVM. Here are the details of his inquiry

"I am using a BQ25618EVM charger IC for Li-ion battery charging. While testing the IC using an electronic load instead of a battery and setting the input current via the EV2400 I2C interface, I found that when I set the charging current to 60 mA using BQStudio, the measured current supplied to the electronic load is 80 mA. This trend existed even when I increased the current until 160 mA. However, upon increasing the current beyond 200 mA, the measured and set current values matched again. Also, when I set the current to 40 mA, the measured current was recorded as 40 mA.

I have multiple units of BQ25618EVM and I found this issue only with 2 out of 10 units. Also, I tried testing these ICs again using actual batteries and the same trend existed. Moreover, I checked the startup register settings of this IC, and it matched the default settings mentioned in the BQ25618 IC datasheet.

So why is the measured current different than the set current in some of the ICs? Please let me know how I can troubleshoot this issue."

Regards,

Danilo

  • 0
    TI__Expert 5590 points

    Hi, 

    Looks like this could be setup related. What is the VBAT at your setup? Do yo use CV mode of electronic load? Can you add a bulk cap at the load? Regarding you have different test results on different EVMs, you may switch the IC units between different boards and find out if the discrepancy exists. This will help identify this is caused by ICs or boards. If you use real battery, change the battery voltage (by charge and discharge) and double check. In CV mode, battery impedance affect charge current.