IRDC3899-P1V2

12/8/2011

14

PCB METAL AND COMPONENT PLACEMENT

Evaluations have shown that the best overall performance is achieved using the substrate/PCB layout

as shown in following figures. PQFN devices should be placed to an accuracy of 0.050mm on both X

and Y axes. Self-centering behavior is highly dependent on solders and processes, and experiments

should be run to confirm the limits of self-centering on specific processes. For further information, please

refer to “SupIRBuck™ Multi-Chip Module (MCM) Power Quad Flat No-Lead (PQFN) Board Mounting

Application Note.” (AN1132)

Figure 20: PCB Metal Pad Spacing (all dimensions in mm)