MPQ4558 – 1A, 2MHz, 55V STEP-DOWN CONVERTER, AEC-Q100 QUALIFIED

MPQ4558 Rev. 1.01

www.MonolithicPower.com

18

5/17/2013

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2013 MPS. All Rights Reserved.

PCB LAYOUT GUIDE

PCB layout is very important to achieve stable

operation. Duplicate the EVB layout below for

optimal performance.

For changes, please follow these guidelines

and use Figure 3 for reference.

1) Keep the switching-current path short and

minimize the loop area formed by the input

capacitor, high-side MOSFET and external

switching diode.

2) Place the bypass ceramic capacitors close

3) Use short and direct feedback connections.

Place

the

feedback

resistors

and

compensation components as close to the

chip as possible.

4) Route the SW path away from sensitive

analog areas such as the FB path.

5) Connect IN, SW, and GND, respectively, to

a large copper area to cool the chip to

improve thermal performance and long-

term reliability.

MPQ4558

COMP

FB

FREQ

EN

VIN

GND

SW

BST

3.3V @ 1A

8V to 55V

CONTROL

C1

C4

680pF

D1

C3

100nF

C2

L1

R1

127k

R2

40.2k

R3

200k

R4

24k

MPQ4558 Typical Application Circuit

R6

C4

C1

R1

GND

GND

Vin

Vo

SW

L1

C2

D1

GND

TOP Layer

Bottom Layer

MPQ4558DN Layout Guide