• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 62 subscribers
  • Views 347 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

BQ25895: BQ25895 charge current is limit

user44411751
Intellectual 940 points
Part Number: BQ25895M


When the input voltage is 9V, the charging current can reach the set value (such as setting 2.6a), but when the input voltage is 5V, the maximum charging current can only reach 1.7a.

  • 0
    TI__Guru**** 169876 points

    Hi,

    What is the input current limit setting?  If the input current limit setting is too low, then the charger buck converter will be power limited.  You can estimate maximum output current using the power balance equation:  eff=VOUT*IOUT/(VBUS*ILIM). Efficiency can be estimate from the datasheet efficiency curves on d/s page 13 but, at VBUS=5V, 92% is a good average. On the BQ25895M, at startup, the input current limit is the LOWER of the value set by the D+/D- pins or the ILIM pin resistor. 

    Regards,

    Jeff