FM9688A/B is an integrated power management IC specially designed for mobile power supply. It integrates lithium battery charging management and high-efficiency boost output.
LED indicator and key function module.
SW 1 Inductance drive pin, drain end of power tube
GND 2 Chip ground
BAT 3 battery positive terminal detection pin
VIN 4 power input pin
DBLU 5 discharge status indicator output
DRED 6 charging status indicator output terminal
TAP 7 button pin
OUT 8 Current output pin / remote end of power P tube