RT8288 datasheet(13/14 Pages) RICHTEK

13 / 14 page

RT8288

DS8288-03

June 2012

www.richtek.com

is a registered trademark of Richtek Technology Corporation.

Figure 7. PCB Layout Guide

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.

CIN

CBOOT

VOUT

COUT

GND

VOUT

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.

VIN

BOOT

GND

VCC

GND

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.

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