MP3418 – 400mA, 1.2MHz, SYNCHRONOUS, STEP-UP CONVERTER WITH OUTPUT DISCONNECT

MP3418 Rev 1.0

www.MonolithicPower.com

12

2/7/2013

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PCB Layout Considerations

Layout is important, especially for switching

power supplies with high switching frequencies;

poor layout results in reduced performance,

EMI problems, resistive loss, and even system

instability.

Following the rules below can help ensure a

stable layout design:

1. Place a decoupling capacitor (>100nF) as

placing vias between the OUT pin and the

output capacitor to reduce spikes on the SW

node and improve EMI performance.

2. Place the input capacitor, output capacitor,

and inductor as close to the IC as possible

with a short and wide trace.

3. Place the feedback divider resistors as

close as possible to the control GND

(AGND) pin.

4. Use a large copper GND area to lower the

die temperature.

Figure 2 shows the recommended component

placement for the MP3418.

EN

FB

SW

PGND

IN

OUT

NC

AGND

Via

MP 3418

Bottom Layer

Top Layer

Put this Decoupling Cap

close to OUT and GND

Via

Vin

GND

Vout

Figure 2: Recommended PCB Layout