MP4558 – 1A, 2MHz, 55V STEP-DOWN CONVERTER
2) Place the bypass ceramic capacitors close
to the VIN pin.
PCB LAYOUT GUIDE
PCB layout is very important to achieve stable
operation. Duplicate the EVB layout below for
optimal performance.
3) Use short and direct feedback connections.
Place the feedback resistors and
compensation components as close to the
chip as possible.
For changes, please follow these guidelines
and use Figure 5 for reference.
4) Route the SW path away from sensitive
analog areas such as the FB path.
1) Keep the switching-current path short and
minimize the loop area formed by the input
capacitor, high-side MOSFET and external
switching diode.
5) Connect IN, SW, and GND, respectively, to
a large copper area to cool the chip to
improve thermal performance and long-
term reliability.
MP4558 Typical Application Circuit
GND
L1
R1
SW
C4
D1
R6
C2
C1
Vin
GND
GND
Vo
TOP Layer
Bottom Layer
MP4558 Layout Guide
Figure 5: MP4558 Typical Application Circuit and PCB Layout Guide
MP4558 Rev. 1.01
10/28/2013
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