MP2452―1A, 36V, 1MHz, STEP-DOWN CONVERTER

MP2452 Rev. 1.0

www.MonolithicPower.com

15

9/27/2010

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PCB LAYOUT

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 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.

MP2452

SW

VIN

EN

FB

GND

BST

NC

NC

2

18

6

4

3

7

5

C3

R3

R4

C1

C4

L1

D1

VIN

EN

o

o

o

MP2452 Typical Application Circuit

7

8

1

2

3

4

10

9

N/C

N/C

SW

EN

VIN

GND

BST

FB

C4

C2

C1

D1

R3

R4

R2

L1

GND

Vo

SW

Vin

GND

Top Layer

Bottom Layer

Figure 5—Typical Application Circuit and PCB Layout Guide (Double Layers)