AAT3686
USB Port/AC Adapter
Lithium-Ion/Polymer Battery Charger
Pin Descriptions
Pin #
(TDFN34-16/
TDFN44-16)
Name
Type
Function
1
2
3
4
5
USB
BAT
In
USB power supply input.
In/Out
In
Battery charging and sensing.
ADP
GND
CHR
Adapter input.
Ground
In/Out
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.
6
7
EN
In
Enable pin. Logic high enables the IC.
ADPP#
Out
Adapter present indicator. This pin is open drain until ADP pin reaches
threshold.
8
TS
In/Out
In/Out
Out
Connect to 10kΩ NTC thermistor.
9
DATA
STAT2
STAT1
CT
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.
Timing capacitor to adjust internal watchdog timer. Set maximum charge time
for adapter powered trickle, CC, and CV charge modes. The watchdog timer
only sets the timers for adapter battery charging; there is no timeout for the
battery charging from the USB input. If timing function is not needed, termi-
nate this pin to ground.
10
11
12
Out
In/Out
13
14
15
16
EP
USBSEL
USBL
In
When USB is present, use this pin to toggle between 100mA and 500mA limit.
Connect resistor here to set charge current for low-current USB port.
Connect resistor here to set charge current for high-current USB port.
Use resistor at this pin to set adapter charging current.
Exposed paddle (bottom); connect to GND directly beneath package.
In/Out
In/Out
USBH
ADPSET In/Out
Pin Configuration
TDFN34-16
(Top View)
TDFN44-16
(Top View)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
ADPSET
USBH
USBL
USBSEL
CT
STAT1
STAT2
DATA
ADPSET
USBH
USBL
USBSEL
CT
STAT1
STAT2
DATA
USB
BAT
ADP
GND
CHR
EN
USB
BAT
ADP
GND
CHR
EN
ADPP#
TS
ADPP#
TS
2
3686.2006.10.1.9
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
