MP8845

MP8845 Rev. 1.1

www.MonolithicPower.com

21

2/23/2017

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PCB Layout Guidelines

Efficient PCB layout of the switching power

supplies

and

the

high-switching

converter

especially is critical for stable operation. If the

layout is not done carefully, the regulator could

show poor line or load regulation and stability

issues. For best results, refer to Figure 3 and

follow the guidelines below.

1. Place the high-speed, step-down regulator

and the input capacitor as close to the IC

pins as possible.

Figure 3 shows a size 0805 ceramic

capacitor.

2. Connect the two ends of the ceramic

capacitor to VIN and GND directly.

A 0603 size decoupling ceramic capacitor is

strongly recommended.

PG

EN

SCL

VOUT

SDA

GND

AGND

GND

GND

GND

GND

GND

VIN

VIN

SW

SW

VIN

VIN

SW

SW

C1A

C2A

C2B

C1B

L1

GND

VIN

VO

SDA

EN

VOUT

SCL

PG

Figure 3: Recommend Layout

Design Example

Table 3 is a design example following the

application

guidelines

for

the

specifications

below.

Table 3: Design Example

5V

0.9V

5A

The detailed application schematic is shown in

Figure 4. The typical performance and circuit

waveforms

are

shown

in

the

Typical

Performance Characteristics section. For more

device applications, please refer to the related

evaluation board datasheet.