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
Yes
UVLO
VP > VUVLO
No
Switch
No
Sleep
Mode
Power On
Reset
ADP
Loop
Enable
Thermal
Loop
Fault
Yes
Conditions Monitor
OV, OT
No
Timing
Shut Down
Expire
No
Recharge Test
VRCH > VBAT
Yes
Battery
No
Temperature Monitor
Battery
VTS1 < TS < VTS2
Temperature
No
Device
Temperature
Monitor
TJ > 110°C
Yes
Thermal Loop
Current
Reduction
Yes (AAT3687)
Charge
Safety Timer
Yes
Preconditioning Test
Low Current
Set
VMIN > VBAT
Conditioning
No
Yes
Current Phase Test
VCH > VBAT
Current
Charging
Mode
No
Yes
Voltage Phase Test
IBAT > IMIN
No
Charge
Completed
Voltage
Charging
Mode
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
3687.2006.06.1.5
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