MP28258 – 3A, 4.2V-20V INPUT, FAST TRANSIENT SYNCHRONOUS STEP-DOWN CONVERTER IN QFN12 (2X3mm)

MP28258 Rev 1.14

www.MonolithicPower.com

17

9/25/2012

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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.

5) The external feedback resistors should be

placed next to the FB pin. Make sure that

there is no via on the FB trace.

6) Keep the BST voltage path (BST, C3, and

SW) as short as possible.

7) Four-layer layout is recommended to achieve

better thermal performance.