AAT3686IRN-4.2-T1 Advanced Analog Technology, Inc., AAT3686IRN-4.2-T1 Datasheet - Page 12

• Manufacturer Part Number: AAT3686IRN-4.2-T1
• Description: USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger
• Manufacturer: Advanced Analog Technology, Inc.

When the input supply is disconnected or drops
below UVLO or EN = 0, the charger will automati-
cally enter power-saving sleep mode. Consuming
an ultra-low 0.3µA in sleep mode (1µA for
AAT3686-1), the AAT3686 minimizes battery drain
when it is not charging. This feature is particularly
System Operation Flow Chart
12
No
Recharge Test
V
Power On
RCH
Output
ADPP
Reset
> V
BAT
Yes
Yes
Yes
Voltage Test
ADP > V
Current Loop
Current Loop
USB High
USB Low
Preconditioning Test
Current Phase Test
Conditions Monitor
Voltage Phase Test
ADP
Loop
ADP
V
Temp. Monitor
TS1
V
V
I
Completed
ADPP
BAT
EOC
No
OV, OT
MIN
Battery
< TS < V
Charge
Fault
> I
> V
> V
TERM
No
BAT
No
BAT
No
No
ADP
TS2
0
1
Power Select
Yes
Yes
Yes
USBSEL = ?
USB Detect
No
Lithium-Ion/Polymer Battery Charger
USB Voltage
Conditioning
Temp. Fault
Low Current
Yes
USB
Regulation
Shutdown
Charging
Charging
Voltage
Current
Charge
Battery
Enable
Mode
Mode
Mode
useful in applications where the input supply level
may fall below the battery charge or under-voltage
lockout level. In such cases where the AAT3686
input voltage drops, the device will enter sleep
mode and automatically resume charging once the
input supply has recovered from its fault condition.
Yes
Enable
Expire
Timing
V
P
UVLO
> V
Charge
Safety
Timer
Timer
UVLO
No
Set
USB Port/AC Adapter
No
Yes
Device Temp. Monitor
Reduction in USB
Reduction in ADP
USB Voltage Test
Charging Mode
Charging Mode
Loop Enable
Thermal Loop
Yes
T
V
USB Loop
Thermal
Switch
J
USB
Sleep
Mode
Current
Current
On
> 110°C
< 4.5V
No
Yes
No
3686.2006.10.1.9