Hi,
I am designing a project with an embedded, not replaceable, miniature Polymer Lithium Ion rechargeable battery with a capacity of 12mAh.
The battery manufacturer recommend charging at 0.1C, in this case 1.2 mA . (absolute maximum charging current of 2C = 24 mA)
I was planning to use the "LM3658 Dual Source USB/AC Li Chemistry Charger IC for Portable Applications", with a USB source, since it seems to have all the features needed to charge a lithium battery and ensure long life for the battery (since it is not replaceable).
I contacted the battery manufacturer and he suggested to charge directly with a 4.2V source and a limiting resistor to limit the charging current to no more than 10mA, disregarding all the charging phases recommended for regular Lithium Ion batteries.
I notice that the pre-qualification current for the LM3658 device is 25 mA. Is it something that can be programmed lower?
If I charge through a limiting resistor would that impede the correct calculations of all the phases of the charger, since the measured voltage will not be the battery voltage but the combination of the battery voltage and the drop voltage on the limiting resistor?
Is there any other IC more suitable for this type of small battery? I saw some others (bq2409x series) with similar minimum currents which are still too high.
I would appreciate any guidance.
Thank you.
