MP2617B Charge current mismatch

Battery Management
1

Hello, I am currently developing a model using the MP2617B.
I set the RISET value to 845 ohms to configure the charging current to 2.45A. However, when I measure the actual charging current, it does not reach the expected level. The charging current varies depending on the battery voltage, and the maximum charging current reaches only about 2A, which is lower than the configured value.

What aspects should I check to resolve this issue?

My setting for reference:

  • Input voltage is 5V
  • Input Voltage Limit is 4.56V
  • Input Current Limit is 3.04A
  • The SYSFB pin is in a floating state.
  • M0 is set to High, and M1 is set to Low.
  • Battery : 21700 Li-ion Rechargeable Battery 5000mAh
2

What is the input voltage? I know you seem to think it is 5V but have you measured it at the IC
the charge current is for discharged 3.6V batteries as the battery voltage rises the charge will taper.

3

Thank you for your help. After measuring directly at the IC, I confirmed that there is some voltage loss in the connection path for both the input voltage and the battery voltage. By minimizing the voltage loss along the path, I verified that the charging current matches the set value. Thank you.