MP4559 – 1.5A, 2MHz, 55V STEP-DOWN CONVERTER

MP4559 Rev. 1.01

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17

12/23/2013

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PCB LAYOUT GUIDE

PCB layout is very important to achieve stable

operation. It is highly recommended to duplicate

EVB layout for optimum performance.

If change is necessary, please follow these

guidelines and take Figure 5 for reference.

1) Keep the path of switching current short

and minimize the loop area formed by Input

cap, high-side MOSFET and external

switching diode.

2) Bypass ceramic capacitors are suggested

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.

MP4559 Typical Application Circuit

R6

C4

C1

R1

GND

GND

Vin

Vo

SW

L1

C2

D1

GND

TOP Layer

Bottom Layer

MP4559DN Layout Guide