AAT3685
Lithium-Ion/Polymer Battery Charger
Pin Descriptions
Pin #
Name
Type
Function
1
2
3
4
ADP/USB
BAT
In
Line adapter or USB power supply input.
In/Out
Ground
In/Out
Battery charging and sensing.
GND
Ground connection.
CHR
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.
5
6
EN
TS
In
In/Out
In/Out
Out
Enable pin. Logic high enables the IC.
Connect to 10kΩ NTC thermistor.
7
DATA
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.
8
STAT2
STAT1
PWRSEL
9
Out
10
In
11
12
EP
SETL
SETH
In/Out
In/Out
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.
Pin Configuration
TDFN33-12
(Top View)
1
2
3
4
5
6
12
11
10
9
ADP/USB
BAT
SETH
SETL
PWRSEL
STAT1
STAT2
DATA
GND
CHR
EN
8
7
TS
2
3685.2006.10.1.3
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
