AAT3663 Datasheet, PDF (19/22 Pages) Advanced Analogic Technologies – 1A Linear Li-Ion Battery Charger for Single and Dual Cell Applications

AAT3663
1A Linear Li-Ion Battery Charger
for Single and Dual Cell Applications
then a C_IN capacitor in the range of 10μF should be
used. A larger input capacitor in this application will
minimize switching or power transient effects when
the power supply is "hot plugged" in.
Output Capacitor
The AAT3663 only requires a 1μF ceramic capaci-
tor on the BAT pin to maintain circuit stability. This
value should be increased to 10μF or more if the
battery connection is made any distance from the
charger output. If the AAT3663 is to be used in
applications where the battery can be removed
from the charger, such as desktop charging cra-
dles, an output capacitor 10μF or greater is recom-
mended to reduce the effect of the charger cycling
on and off when no battery is present.
Printed Circuit Board Layout
Considerations
For the best results, it is recommended to physically
place the battery pack as close as possible to the
AAT3663 BAT pin. To minimize voltage drops on the
PCB, keep the high current carrying traces ade-
quately wide. For maximum power dissipation of the
AAT3663 3x3mm 14-pin TDFN package, the metal
substrate should be solder bonded to the board. It is
also recommended to maximize the substrate con-
tact to the PCB ground plane layer to further
increase local heat dissipation. Refer to the AAT3663
evaluation board for a good layout example.
Figure 7: AAT3663 Evaluation Board
Top (Component) Side Layout.
Figure 8: AAT3663 Evaluation Board
Bottom Side Layout.
3663.2007.10.1.0
19