MP1584 – 3A, 1.5MHz, 28V STEP-DOWN CONVERTER

MP1584 Rev. 1.0

www.MonolithicPower.com

16

8/8/2011

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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 to

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.

C1

C3

R2

R1

L1

C4

C2

D1

VIN

EN

FREQ

GND

BST

SW

FB

COMP

MP1584

EN

R5

R6

R3

R4

MP1584 Typical Application Circuit

Top Layer

Bottom Layer

Figure 5―MP1584 Typical Application Circuit and PCB Layout Guide