MP1482 – 2A, 18V SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER

MP1482 Rev. 1.31

www.MonolithicPower.com

11

7/9/2012

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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 4 for reference.

1) Keep the path of switching current short and

minimize the loop area formed by input cap,

high-side MOSFET and low-side MOSFET.

2)

Bypass ceramic capacitors are suggested

to be put close to the Vin Pin.

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.

INPUT

4.75V to 18V

OUTPUT

C1

C2

R4

C4

C3

D1

(optional)

C5

L1

R3

R2

R1

MP1482

BS

IN

FB

SW

SS

GND

COMP

EN

1

2

3

5

6

4

8

7

MP1482 Typical Application Circuit

L1

C4

R4

C3

R3

PGND

R1

R1

C5

D1

C2

PGND

C1

R2

SGND

Top Layer

Bottom Layer

Figure 4—MP1482 Typical Application Circuit and PCB Layout Guide