AAT3681
USB Port or AC Adapter
Lithium-Ion/Polymer Battery Charger
System Operation Flow Chart
Enable
Yes
Power On Reset
No
Power Input
Voltage
V
IN > VUVLO
Yes
Fault Conditions
Monitoring
OV, OT
Charge
Control
Shut Down
Yes
No (AAT3681)
Preconditioning
Test
VMIN > VBAT
No (AAT3681-1)
Preconditioning
(Trickle Charge)
Yes
No
No
Constant
Current Charge
Mode
Recharge Test
VRCH > VBAT
Current Phase Test
Yes
Yes
V
IN > VBAT
No
Constant
Voltage Charge
Mode
Voltage Phase Test
IBAT > ITERM
Yes
No
Charge Completed
10
3681.2007.01.1.2