AAT3682
Lithium-Ion/Polymer Linear Battery Charger
Power On Reset
Power On Reset
UVLO
No
Shut Down
Shut Down
Mode
V
CC > VUVLO
Mode
Yes
Temperature
Temperature
Fault
Temperature Test
TS > VTS1
No
Fault
TS < VTS2
Yes
Low Current
Yes
Yes
Yes
Conditioning
Low Current
Charge
Conditioning
(Trickle Charge)
Charge
Preconditioning Test
VMIN > VBAT
No
Current
Current
Charging
Charging
Mode
Current Phase Test
VCH > VBAT
Mode
No
Voltage
Phase Test
VTERM
Voltage
Voltage
Charging
Charging
Mode
< IBAT
RSENSE
Mode
No
< VRCH
Charge Complete
Charge Complete
Latch Off
Latch Off
Figure 1: AAT3682 Operational Flow Chart.
Preconditioning
(Trickle Charge)
Phase
Constant Current
Phase
Constant Voltage
Phase
Output Charge
Voltage (VCH
)
Preconditioning
Voltage Threshold
(VMIN
)
Regulation
Current
(ICHARGE(REG)
)
Trickle Charge
and Termination
Threshold
Figure 2: Typical Charge Profile.
3682.2006.12.1.3
9
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
