AAT3688
USB Port Lithium-Ion/Polymer Battery Charger
Pin Descriptions
Pin #
Name
Type
Function
1
2
3
4
USB
BAT
In
USB power supply input.
In/Out
Ground
In/Out
Battery charging and sensing.
GND
CHR
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 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
STAT2
STAT1
USBSEL
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 USB is present, use this pin to toggle between USBH and USBL
charging levels.
8
9
Out
10
In
11
12
EP
USBL
USBH
In/Out
In/Out
Connect resistor here to set charge current for low-current USB port.
Connect resistor here to set charge current for high-current USB 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
USB
BAT
GND
CHR
EN
USBH
USBL
USBSEL
STAT1
STAT2
DATA
8
7
TS
2
3688.2006.10.1.5
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
