AN018 Thermal Considerations &
QFN Layout Guide
2 Revision 1.1
CONTENTS
introduction ..............................................................................................................................................3
QFN Heat-Sink ........................................................................................................................................3
As11xx Family PD Controllers ................................................................................................................3
Typical Power Dissipation in the AS11xx Family ....................................................................................4
Silicon Junction Temperature .................................................................................................................5
Guidelines for PCB Layout ......................................................................................................................6
PCB Layout .............................................................................................................................................6
Solder Mask Design ................................................................................................................................8
Preparing Thermal Vias for Solder Reflow..............................................................................................9
Stencil Design .........................................................................................................................................9
Solder Process ..................................................................................................................................... 10
Rework ................................................................................................................................................. 10
Contact Information ................................................................................................................................... 12
Important Notices ................................................................................................................................. 12
Legal Notice ......................................................................................................................................... 12