RT8287 datasheet(13/14 Pages) RICHTEK

13 / 14 page

RT8287

DS8287-03

June 2012

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Layout Considerations

Follow the PCB layout guidelines for optimal performance

of the IC.

Keep the traces of the main current paths as short and

wide as possible.

Put the input capacitor as close as possible to the device

pins (VIN and GND).

SW node is with high frequency voltage swing and

should be kept at small area. Keep analog components

away from the SW node to prevent stray capacitive noise

pickup.

Figure 7. PCB Layout Guide

Connect feedback network behind the output capacitors.

Keep the loop area small. Place the feedback

components near the IC.

Connect all analog grounds to a common node and then

connect the common node to the power ground behind

the output capacitors.

An example of PCB layout guide is shown in Figure 7

for reference.

VIN

AGND

GND

VCC

BOOT

PGOOD

GND

CIN

CBOOT

VOUT

COUT

GND

VOUT

CSS

GND

Place the input and output

capacitors as close to the

IC as possible.

SW should be

connected to

inductor by wide

and short trace and

keep sensitive

components away

from this trace.

Place the

feedback as

close to the IC

as possible.

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