UM3500 Datasheet, PDF (9/11 Pages) List of Unclassifed Manufacturers – 40 Watts DC-DC Converters

UM3500
Layout Guidance
When laying out the PC board, the following suggestions should be taken to ensure proper
operation of theUM3500.
1. The power traces, including the GND trace, the SW trace and the VIN trace should be kept
short, direct and wide to allow large current flow. Put enough multiply-layer pads when they
need to change the trace layer.
2. Connect the input capacitor C1 to the VIN pin as closely as possible to get good power filter
effect.
3. Keep the switching node, SW, away from the sensitive FB node.
4. Do not trace signal line under inductor.
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http://www.union-ic.com Rev.02 Jun.2012
9/11