Hello,
Any ideas on this IC?
Marking: "K9GK", "818"
Thank you
It is in a electronic cigarette mod.
It is used for charging a Lion battery at 890mA.
USB input (5V), 4.19V output.
The problem is that it gets extremely hot.
I can't see all the connections because there are 2 pcbs.
I must find a way to limit the charging current.
Pin-1 is the input (microUSB)
Pin-10 is the output (4.19V).
Pin-2 is connecting to microcontroller.
Between pin8 and ground there is a 20K resistor.
Between pin9 and ground there is a 1.9K resistor.
Between pin4 and 5 there is a resistor.
As I can see there is no voltage divider.
There is neither inductor nor diode.