MP2372 – 3A, 28V, 925KHZ STEP-DOWN CONVERTER

MP2372 Rev. 0.92

www.MonolithicPower.com

10

12/22/2009

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PCB Layout Guide

PCB layout is very important to achieve stable

operation. Please follow these guidelines and

take Figure2 and 3 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, do not

solder exposed pad of the IC.

C1

D1

R3

R1

C2

R4

SGND

PGND

L1

C3

R2

C6

Figure2―PCB Layout for Single Layer

C5

C1

D1

C3

R3

C2

R4

L1

SGND

PGND

C4

C6

Vout

Feeback

SGND

Top Layer

Bottom Layer

Figure3―PCB Layout for Double Layer