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Original question:

Power converter for Handheld device

BQ25886: Battery is not charging

Vishwanath G
Intellectual 270 points
Part Number: BQ25886

Hi,

I am using BQ25886 in standalone mode and not using OTG feature. I have some questions and issues with it, kindly suggest with the solutions, 

1)  If i do not connect battery, I am not getting any voltage across SYS pin with input supply of 5V, 2 amp source,

2) I have set Vset to 8.4V (Rset=150k), But voltage at BAT remains same with battery voltage 6.5V. Also the STAT LED is ON.

3) Since I am not using USB OTG, I have shorted D+ and D- with 200 ohms resistor (not updated in schematic). and OTG is connected to ground. 

4) ILIM is set to 2A using 555ohms resistor and Ichgset to 1A using 3.81k. (Also 10uF capacitor is connected to PMID w. r. t ground which is not updated in schematic)

As specified in datasheet, I do hope all connections seems good, but dont know the reason why it is not working. Please reply if any design issue in the circuit.

Please find the circuit below,

  • 0
    TI__Mastermind 40305 points

    Dear Vishwanath,

    It seems the schematic didn't make it onto the post. Can you please re-upload the schematic? In addition, can you provide waveforms of VBUS, BAT, SYS, and SW when you are having these problems?

    Thanks,

    Mike Emanuel

    Please click "This resolved my issue" button if this post answers your question.