MP2377 – 3A, 21V, 600KHz STEP-DOWN CONVERTER

MP2377 Rev. 0.92

www.MonolithicPower.com

9

4/19/2011

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PCB Layout Guide

PCB layout is very important to achieve stable

operation. Please follow these guidelines and

take Figure3 and 4 for references.

1) Keep the path of switching current short

and minimize the loop area formed by Input

cap, high-side MOSFET and schottky diode.

2) Keep the connection of schottky diode

between SW pin and input power ground

as short and wide as possible.

3) Ensure all feedback connections are short

and direct. Place the feedback resistors

and compensation components as close to

the chip as possible.

4) Route SW away from sensitive analog

areas such as FB.

5) Connect IN, SW, and especially GND

respectively to a large copper area to cool

the chip to improve thermal performance

and long-term reliability. For single layer

PCB, exposed pad should not be soldered.

Figure 3—PCB Layout for Single Layer

Top Layer

Bottom Layer

Figure 4—PCB Layout for Double Layers