AAT3681A
500mA USB Port or AC Adapter
Lithium-Ion/Polymer Battery Charger
Printed Circuit Board Layout
Considerations
For the best results, it is recommended to physi-
cally place the battery pack as close as possible
to the AAT3681A BAT pin. To minimize voltage
drops on the PCB, keep the high current carrying
traces adequately wide. Refer to the AAT3681A
evaluation board for a good layout example (see
Figures 5 and 6).
Figure 5: AAT3681A Evaluation Board
Top Layer.
Figure 6: AAT3681A Evaluation Board
Bottom Layer.
VIN(ADP)
C1
10μF
JP2
R8
8.06K
AAT3681A
1
2 EN
3 ISET
4 BAT
ADP
8
GND 7
GND 6
GND 5
STAT
U1 (SC70JW-8)
JP1 D1
R1
0Ω
1K
RED LED
VBAT
C2
2.2μF
Figure 7: AAT3681A Evaluation Board Schematic Diagram.
14
3681A.2007.10.1.2