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Axelite Confidential Materials, do not copy or distribute without written consent.

Rev.1.5 Oct.16, 2019

AX3121

Layout Guidance (please refer layout picture)

When laying out the PC board, the following suggestions should be taken to ensure

proper operation of the AX3121. These items are also illustrated graphically in below.

1.

The power traces, including the source trace, the output trace and the inductor trace

should be kept short, direct and wide to allow large current flow.

2.

The power ground is keep input capacitor’s (C4) ground closed and far away signal

ground.

3.

The C7 bypass capacitor must be closed to SVCC and SGND pin.

4.

The exposed pad is connecting to SW trace closely and widely. (Reduce IC

temperature)

5.

Do not trace signal line under inductor.

(AX3121 SOP-8L-EP PCB Layout -Top View)