MP8903 – LOW DROPOUT, 150mA LINEAR REGULATOR

MP8903 Rev. 1.11

www.MonolithicPower.com

8

4/4/2011

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

© 2011 MPS. All Rights Reserved.

PCB LAYOUT GUIDE

PCB layout is very important to achieve good regulation, ripple rejection, transient response and

thermal performance. 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) Input and output bypass ceramic capacitors are suggested to be put close to the IN Pin and OUT

Pin respectively.

2) Ensure all feedback connections are short and direct. Place the feedback resistors and

compensation components as close to the chip as possible.

3) Connect IN, OUT and especially GND respectively to a large copper area to cool the chip to

improve thermal performance and long-term reliability.

MP8903DG

FB

OUT

8

5,6

GND

4

EN

IN

2

3,4

OUTPUT

C3

C2

C1

R3

R1

R2

MP8903DJ

FB

OUT

4

5

GND

2

EN

IN

3

1

OUTPUT

C3

C2

C1

R3

R1

R2

R2

IN

R1

C2

C1

C3

OUT

GND

R3

IN

EN

OUT

IN

OUT

NC

FB

GND

6

7

8

1

2

3

4

5

C1

1

2

34

5

VIN

EN

GND

FB

OUT

C3

VIN

VOUT

GND

R1

R2

C2

C3

R3

Top Layer

Figure 5—PCB Layout