AAT3687 Datasheet, PDF (11/22 Pages) Advanced Analogic Technologies – Lithium-Ion/Polymer Battery Charger

System Operation Flow Chart
AAT3687
Lithium-Ion/Polymer Battery Charger
Output
ADPP
Yes
ADP
Voltage
ADP > VADPP
No
Yes
UVLO
VP > VUVLO
Yes
Switch
No
No
Sleep
Mode
Power On
Reset
ADP
Loop
Enable
Thermal
Loop
Fault
Conditions Monitor
OV, OT
Yes
No
Timing
Yes
Shut Down
Expire
Battery
No
Temperature Monitor
Battery
VTS1 < TS < VTS2
Temperature
No
Device
Temperature
Monitor
TJ > 110°C
Yes
Thermal Loop
Current
Reduction
Yes
(AAT3687)
Yes
No
Recharge Test
VRCH > VBAT
Preconditioning Test
VMIN > VBAT
Low Current
Conditioning
Charge
Safety Timer
Set
No
Yes
Current Phase Test
VEOC > VBAT
Current
Charging
Mode
No
Yes
Voltage Phase Test
IBAT > ITERM
No
Voltage
Charging
Mode
Charge
Completed
Application Information
Adapter Power Input
Constant current charge levels up to 1.5A may be
programmed by the user when powered from a suf-
ficient input power source. The AAT3687 will oper-
ate from the adapter input over a 4.0V to 5.5V
range.
The constant current fast charge current for the
adapter input is set by the R_SET resistor connected
between the ADPSET and ground. Refer to Table 1
for recommended R_SET values for a desired con-
stant current charge level. The presence of voltage
on the adapter input is indicated by the ADPP# pin
function. This indicator pin uses an internal open
drain device that will pull the ADPP# pin low when
3687.2006.10.1.7
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