AAT3682
Lithium-Ion/Polymer Linear Battery Charger
Pin Description
Pin #
Symbol
Function
1
2, 3, 8, 12
4
TS
N/C
Battery temperature sense input.
Not connected.
STAT
Battery charger status output. Connect an LED in series with 2.2kΩ from STAT to VIN
for a visual monitor battery charge state or connect to a microcontroller to monitor bat-
tery status. A 100kΩ resistor should be placed between STAT and VIN for this function.
Common ground connection.
5
6
7
VSS
DRV
T2X
Battery charge control output.
Battery trickle charge control input. Connect this pin to VSS to double the battery trickle
charge current. Leave this pin floating for normal trickle current (10% of full charge cur-
rent). To enter microcontroller fast-read status, pull this pin high during power up.
Battery charge control output. Current regulated output to charge the battery. For best
operation, a 0.1µF ceramic capacitor should be placed between BAT and GND.
Common ground connection.
9
BAT
10
11
VSS
GATE
VP
Input voltage for biasing the pass device.
13
14
15
16
EP
Battery charge power input.
CSI
Current sense input.
BSENSE
VCC
Battery voltage sense input.
AAT3682 bias input power.
Exposed paddle (bottom); connect to GND directly beneath the package.
Pin Configuration
QFN44-16
(Top View)
1
2
3
4
12
11
10
9
TS
N/C
N/C
GATE
VSS
BAT
AAT3682
N/C
STAT
2
3682.2006.12.1.3
AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
