Lithium-Ion/Polymer Battery Charger
Pin Descriptions
Pin #
1
2
3
4
AAT3685
Name
ADP/USB
BAT
GND
CHR
Type
In
In/Out
Ground
In/Out
Function
Line adapter or USB power supply input.
Battery charging and sensing.
Ground connection.
Resistor divider to set USB voltage regulation for charge reduction mode.
Leave this pin open for default 4.5V USB regulation point. Tie to ADP/USB
pin to disable this function.
Enable pin. Logic high enables the IC.
Connect to 10kΩ NTC thermistor.
Status report to microcontroller via serial interface, open-drain.
Battery charge status indicator pin to drive an LED: active low, open-drain.
Battery charge status indicator pin to drive an LED: active low, open-drain.
When ADP/USB is present, use this pin to toggle between SETH and SETL
charging levels.
Connect resistor here to set charge current for low-current port.
Connect resistor here to set charge current for high-current port.
Exposed paddle (bottom); connect to GND directly beneath package.
5
6
7
8
9
10
11
12
EP
EN
TS
DATA
STAT2
STAT1
PWRSEL
SETL
SETH
In
In/Out
In/Out
Out
Out
In
In/Out
In/Out
Pin Configuration
TDFN33-12
(Top View)
ADP/USB
BAT
GND
CHR
EN
TS
1
2
3
4
5
6
12
11
10
9
8
7
SETH
SETL
PWRSEL
STAT1
STAT2
DATA
2
3685.2006.10.1.3
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
