• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 64 subscribers
  • Views 113 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

BQ25505: BQ25505 VBAT_OV not crorrect

Star Xu
Genius 9645 points
Part Number: BQ25505

Hi

The customer design with BQ25505, and find the VBAT_OV is not correct.

Attached the schematic

ROV1 and ROV2 set VBAT_OV the maximum OV is 3.1V, but in fact, but the actual charge is more than 3.1V.

How to solve this problem?

Waiting for your reply.

Thanks

Star

  • +1
    TI__Guru**** 153276 points

    Hi Star,

    There are 2 possible causes.  If the 0.01-0.1uF VSTOR cap is not placed as close as possible to IC, switching noise can cause regulation issue.  The other more likely cause is parasitic resistance from residual solder flux as explained in the datasheet layout section.  I recommend removing the megaohm sized resistors, cleaning the board and then reinstalling them standing or their side are replacing them with 10-50x lower sized resistors to confirm that is the issue.

    Regards,

    Jeff