Diodes AP1538 - Manual (Page 10)

AP1538
18V 3A 300KHz BUCK CONVERTER
AP1538 Rev. 5 10 of 13 OCTOBER 2009
DS31451 www.diodes.com © Diodes Incorporated
Top Side Layout Guide
Bottom Side Layout Guide
Functional Description
(Continued)
Use vias to conduct the heat into the backside of
PCB layer. The heat sink at output (SW) pins should
be allowed for maximum solder-painted area.
Keep the gap of exposed pads from short circuit.
Recommended exposed-pads gap: 30~40mil
(0.75~1mm)
Brown: IC exposed pads.
Red: recommended layout.
Reference pads layout dimension:
Output: 90 x 50 mil
Vss: 90 x 60 mil