Hi team,
Customer is designing BQ24040 as the charger IC in our design. It is working as expected with normal charging current (<500 mA).
The behavior customer would like to clarify is when customer set a higher charging current (1 A).
In that specific case, customer can see that the charging current depends quite a lot on the input voltage.
But even with an input voltage above IN_DPM (4.4V), the output current varies (see picture below, right plot, current not stable):
would you please review and provide comment?
The closest guess is that the voltage dropout across the IC must be high enough with high output current to satisfy the output current setting.
But customer has not found much info on that on the DS.
Here is the corresponding dropout:
Would you be able to confirm / disprove customer guess, and therefore tell us about what would be the implication regarding the charging process ?
BR,
SHH