MP8903 – LOW DROPOUT, 150mA LINEAR REGULATOR
MP8903 Rev. 1.11 www.MonolithicPower.com 8
4/30/2015 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2015 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
OUTPU
V
IN
V
IN
C3
C2
C1
R3
R1
R2
MP8903DJ
FB
OUT
4
5
GND
2
EN
IN
3
1
OUTPUT
V
IN
V
IN
C3
C2
C1
R3
R1
R2
R2
IN
R1
C2
C1 C3
OUT
GND
R3
IN
EN
OUTIN
OUT
NC
FB
GND
6
7
81
2
3
4
5
C1
1
2
34
5VIN
EN
GND
FB
OUT
C3
VIN
VOUT
GND
R1
R2
C2
C3
R3
Top Layer
Figure 5—PCB Layout
