MPQ4559 – 1.5A, 2MHz, 55V STEP-DOWN CONVERTER AEC-Q100 QUALIFIED
2) Bypass ceramic capacitors are suggested
PCB LAYOUT GUIDE
to be put close to the VIN Pin.
PCB layout is very important to achieve stable
operation. It is highly recommended to duplicate
EVB layout for optimum performance.
3) Ensure all feedback connections are short
and direct. Place the feedback resistors
and compensation components as close to
the chip as possible.
If change is necessary, please follow these
guidelines and take Figure 5 for reference.
4) Route SW away from sensitive analog
areas such as FB.
1) Keep the path of switching current short
and minimize the loop area formed by Input
cap, high-side MOSFET and external
switching diode.
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.
MPQ4559 Typical Application Circuit
GND
L1
R1
SW
C4
D1
R6
C2
C1
Vin
GND
GND
Vo
TOP Layer
Bottom Layer
MPQ4559DN Layout Guide
MPQ4559 Rev. 1.01
5/24/2016
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