STOD13AS Datasheet, PDF (16/25 Pages) STMicroelectronics – Synchronous rectification for both DC-DC converters

Application information
STOD13AS
7.2
Recommended PCB layout
The STOD13AS is a high frequency power switching device and therefore requires a proper
PCB layout in order to obtain the necessary stability and optimize line/load regulation and
output voltage ripple.
Analog input (V_INA) and power input (V_INP) must be kept separated and connected together
at the C_IN pad only. The input capacitor must be as close as possible to the IC.
In order to minimize the ground noise, a common ground node for power ground and a
different one for analog ground must be used. In the recommended layout, the AGND node
is placed close to C_REF ground while the PGND node is centered at C_IN ground. They are
connected by a separated layer routing on the bottom through vias.
The exposed pad is connected to AGND through vias.
Figure 12. Top layer and silk-screen (top view, not to scale)
Figure 13. Bottom layer and silk-screen (top view, not to scale)
16/25
Doc ID 022733 Rev 1