MP4571

– 60V, 1A, SYNCHRONOUS STEP-DOWN CONVERTER

MP4571 Rev. 1.1

www.MonolithicPower.com

29

2/22/2023

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PCB Layout Guidelines (9)

An optimized PCB layout is critical for proper

operation.

A

4-layer

layout

is

strongly

recommended to improve thermal performance.

For the best results, refer to Figure 7 and follow

the guidelines below:

1. Place high-current paths (GND, IN, and SW)

very close to the device with short, direct, and

wide traces.

2. Use

large

copper

areas

to

minimize

conduction loss and thermal stress.

3. Place the ceramic input capacitors as close to

the IN and GND pins as possible to minimize

high frequency noise.

4. Place the T-type feedback resistors as close

as possible to the FB pin to ensure the trace

connecting to the FB pin is as short as

possible.

5. Route SW and BST away from sensitive

analog areas, such as FB.

6. Use multiple vias to connect the power

planes to the internal layer.

Note:

9) The recommended PCB layout is based on the circuit in Figure

8.

Top Layer and Top Silk

Inner Layer 1

Inner Layer 2

Bottom Layer and Bottom Silk

Figure 7: Recommended PCB Layout