MP28248 – 3A, 4.2V-20V INPUT, FAST-TRANSIENT SYNCHRONOUS STEP-DOWN CONVERTER IN QFN12 (2X3mm)

MP28248 Rev. 1.0

www.MonolithicPower.com

18

1/5/2012

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Layout Recommendation

1) The high current paths (GND, IN, and SW)

should be placed very close to the device

with short, wide, and direct traces.

2) Put the input capacitors as close to the IN

and GND pins as possible.

3) Put the decoupling capacitor as close to the

4) Keep the switching node SW short and away

from the feedback network.

The external feedback resistors should be placed

next to the FB pin. Make sure that there is no via

on the FB trace.

5) Keep the BST voltage path (BST, R3, C3,

and SW) as short as possible.

6) Use a four-layer board to achieve better

thermal performance.