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BQ24090: Charging issue

Cherry Zhou
Mastermind 22235 points
Part Number: BQ24090

Hi team,

Issue: using the BQ24090, it was found that some products were charging with only half the pre-set current value of the first 10S charging, and after about 10S charging, it became normal. Grabbed the NTC voltage value with an oscilloscope and found the voltage value is abnormal.

For the TS pin angle, now the lithium battery uses an NTC of 10K ohms B of 3435, the measured NTC is 8.2K ohms, which is within the resistance range required by the spec.

  1. The customer would like to know what's the possible reason for the NTC voltage abnormality?
  2. When this abnormal voltage occurs, it can make the charging IC mistake to charge at what temperature?
  3. And what is the logic of the TS pin?

Could you help check this case? Thanks.

Best Regards,

Cherry