MP4558

– 1A, 2MHz, 55V STEP-DOWN CONVERTER

MP4558 Rev. 1.01

www.MonolithicPower.com

18

10/28/2013

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PCB LAYOUT GUIDE

PCB layout is very important to achieve stable

operation. Duplicate the EVB layout below for

optimal performance.

For changes, please follow these guidelines

and use Figure 5 for reference.

1)

Keep the switching-current path short and

minimize the loop area formed by the input

capacitor, high-side MOSFET and external

switching diode.

2)

Place the bypass ceramic capacitors close

3)

Use short and direct feedback connections.

Place

the

feedback

resistors

and

compensation components as close to the

chip as possible.

4)

Route the SW path away from sensitive

analog areas such as the FB path.

5)

Connect IN, SW, and GND, respectively, to

a large copper area to cool the chip to

improve thermal performance and long-

term reliability.

MP4558 Typical Application Circuit

R6

C4

C1

R1

GND

GND

Vin

Vo

SW

L1

C2

D1

GND

TOP Layer

Bottom Layer

MP4558 Layout Guide

Figure 5: MP4558 Typical Application Circuit and PCB Layout Guide