LTC4015 Charging for about 20 - 30 second then stop and restart

Hi Sa,

Sounds like a noise issue interfering with charging. This is usually caused by layout issues. Can you please share your layout? PDFs would be preferred.

Regards,

Zack

Hello,

   Please find the attached file.

   I found something for observation, if I remove the C24. the charger works fine but the charge current is not 3.2 A, it's 2.8 A.

Best Regards,

-Sa

Ps, I couldn't attach a file. Then, I sent you in private message instead.

Hi Sa,

C24 is the 2P5Vcc cap, right? You removed it and the charger works?

Do you have vias on the GND pad of the IC? You should have a grid of vias but I don't see them on the layout.

Regards,

Zack

Dear Zack,

   Yes, C24 is 2P5VCC cap.  I removed it and the charger works but I2C doesn't operate.    However, I try to add 10 Ohm series to 2P5Vcc cap and all works fine.

I have a plan to revise this but I don't know what should I consider to adjust. Any suggestion from you ?

attached is the image file for GND pad with via under IC.

Hi Sa,

Yes, I have a list of notes specific to laying out the LTC4015. I've attached it here.

In general for you, add more GND pad vias and move critical components as close to the IC as possible.

DOCX

Regards,

Zack

Hi Zack,

   Thank you. I will re-design our PCB layout then I will be back to give feedback here.

Regards,

Sa

Hi Sa,

Before you submit your design for fabrication, feel free to run it by me. You can send the full layout to me in a private message if you like (PDFs preferred). Or you can post as a continuation here.

Regards,

Zack

Hi Sa,

Before you submit your design for fabrication, feel free to run it by me. You can send the full layout to me in a private message if you like (PDFs preferred). Or you can post as a continuation here.

Regards,

Zack