MP1484 데이터 시트보기 (PDF) - Monolithic Power Systems
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MP1484 Datasheet PDF : 11 Pages
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MP1484 – 3A, 18V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
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 Figure4 for reference.
1) Keep the path of switching current short and
minimize the loop area formed by Input cap,
high-side MOSFET and low-side MOSFET.
2) Bypass ceramic capacitors are suggested
to be put close to the Vin Pin.
3) Ensure all feedback connections are short
and direct. Place the feedback resistors
and compensation components as close to
the chip as possible.
4) Rout 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.
C5
INPUT
4.75V to 18V
R4
2
7
IN
EN
1
BS 3
SW
L1
OUTPUT
MP1484
R1
8
5
SS
FB
C1
GND
COMP
4
6
C3
D1
R2
C2
(optional)
C4
R3
MP1484 Typical Application Circuit
Top Layer
Bottom Layer
Figure 4—MP1484 Typical Application Circuit and PCB Layout Guide
MP1484 Rev. 0.9
www.MonolithicPower.com
10
10/23/2008
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© 2008 MPS. All Rights Reserved.
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