AAT3681AIJS-4.2-3-T1 AnalogicTech, AAT3681AIJS-4.2-3-T1 Datasheet - Page 9

• Manufacturer Part Number: AAT3681AIJS-4.2-3-T1
• Description: 500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger: Trickle Charge: Yes; Enable: Active Low Active Low; Package: SC70JW-8
• Manufacturer: AnalogicTech

Functional Block Diagram
Functional Description
The AAT3681A is a high performance battery charger
designed for single cell lithium-ion/polymer batteries
with up to 500mA of charge current from an external
power source. It is a stand-alone charging solution, with
just one external component required for complete func-
tionality. The AAT3681A precisely regulates battery
charge voltage and current for 4.2V lithium-ion/polymer
battery cells. The AAT3681A-5 regulates battery charge
voltage for 4.1V Lithium-ion/polymer battery cells.
The adapter/USB charge input constant current level can
be programmed up to 500mA for rapid charging applica-
tions. The AAT3681A/-1/-2/-4/-5 is rated for operation
from -40°C to +85°C. In the event of operating ambient
temperatures exceeding the power dissipation abilities of
the device package for a given constant current charge
level, the charge control will enter into thermal limit.
3681A.2009.12.1.7
3681A.2009.12.1.7
BatteryManager
BatteryManager
STAT
TM
TM
ISET
ADP
EN
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger
500mA USB Port or AC Adapter Lithium-Ion/Polymer Battery Charger
Charge
Status
Compare
Constant
Current
Current
w w w . a n a l o g i c t e c h . c o m
w w w . a n a l o g i c t e c h . c o m
Charge
Control
Reverse Blocking
A status monitor output pin is provided to indicate the
battery charge state by directly driving one external
LED.
Device junction temperature and charge state are fully
monitored for fault conditions. In the event of an over-
voltage or over-temperature failure, the device will auto-
matically shut down, protecting the charging device,
control system, and the battery under charge.
Charging Operation
The AAT3681A has four basic modes for the battery
charge cycle: pre-conditioning/trickle charge; constant
current/fast charge; constant voltage; and charge termi-
nation (see Figure 1). (AAT3681A-1 and AAT3681A-4 do
not have trickle charge.)
Temperature
Precharge
Protection
UVLO
Over-
CV/
PRODUCT DATASHEET
PRODUCT DATASHEET
AAT3681A
AAT3681A
GND
BAT
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