I am working with a customer who has integrated the MP2602 single cell battery charger. The design has the following parameters.
VIN = 4.3V
RCHRG = 2.3k
I’m observing that in the design that after the battery is fully charged (e.g. 4.10-4.15V), the MP2602 appears to not begin a new charging cycle until the battery voltage has decreased to ~3.85V. That is much lower than we expected.
With the VIN of 4.3V, the 2602 detects a valid input power as the PG pin is pulled low. The charger is enabled via a resistor configuration.
Would it be possible to provide more detail about how the MP2602 makes a determination of when to begin charging a battery? Is there a hysteresis value in the charger than needs to be below a certain voltage threshold?
With the fairly low VIN value, it is understood that the charge current will be limited or reduced and that is acceptable in this application.
Thank you!