BQ25616: NA

Hello,

Can you confirm if you are using BQ25616 or BQ25616J?

Regards,

Mike Emanuel

Dear ,

used the BQ25616J

Good day

Hello Michael,

This is FAE Dave, and Rence is my customer at industrial PC sector.

First, please see the battery info here:

They've guessed that if it's the internal protection from battery to limit the current input.

However, the battery vendor replied that the battery won't limit the current.

Here's the V-I curve, starting from ambient of 40 degree C, you can see that there is the instant high current and low after 1:51 till battery is fully-charged.

At first, they are guessing the temperature being too high to reach JEITA's VT3, and they test the VTS. Please see the figure below:

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They found that when current is at sudden large value, TS voltage is higher than when it just started.

What could result in the REGN voltage being changed? Is it related to the current being suddenly increased and decreased?

What is the possible reason here? Thanks for the explanation.

Best Regards,
Dave

Dear Mike,

         kindly you please let us know what charge current can't change to 0mA when charge current below 0.1C (>30 mins)

          Test setting as below list 

          1) ambient temp is 45C

          2) Vset is 4.2V  , Charge current is 1.125A

          3) when I charge below <100mA over 1hour as below table(3:40:30 to 5:11:40....) ...

Hello Michael,

Thanks for the explanation here.

I have another two questions.

Based on the description, will the top-off timer be reset when the temperature across T3?

When temperature is above T3, the termination is disabled, then when it's at the top-off timer phase, it should be reset, is it correct?

Another question is:

Do we have the charging flow diagram? (I show the PD controller one here, do we have similar diagram for charger?)

Thanks for the reply.

Best Regards,
Dave

Hello Michael,

The system problem we occur is that when testing the charger, the charge termination is occurred at about 3 hours. But at the 40 degree C ambient, there will be the 3-4 hours difference for this timing (STAT=HIGH), we need to find some reason and we suspect it's related to JEITA, thus we have the problems here.

Please let me summarize our problems:

About JEITA:

1. Based on the JEITA profile, at the high temperature (above T3), the voltage will be decreased to 4.1V. It will not show the STAT high, is it correct?

2. Any timer event is not available at BQ25616J? Is it correct? Top-off timer and safety timer part? There are a lot of paragraphs talking about timers in datasheet. Please help to confirm, and our customer is willing to know whether the timer will be reset at JEITA T3. If timer is not present, then there will be no meaning for the time-out issue.

About charge flow:

Do we have exact flow of charging during different phase?

We would like to know these flows:

1. Room temperature (<T3)

2. High temperature (>T3)

3. Room > High > Room

Thanks for the support.

Best Regards,
Dave

Hello Michael,

Thanks for your reply.

We have another problem here.

At Charge mode, our customer found Vsys1/2 vs. BAT1/2 difference at about 50mV.

Is this within the spec.?

For charge flow, it means the charging tree diagram that be related to the figure I attached.

Best Regards,
Dave

Hello Michael,

Thanks!

It's at charging phase, thus the 50mV should not align. (Should be 180mV typically.)

Best Regards,
Dave