RT7277

13

DS7277-00 October 2012

www.richtek.com

©

Copyright 2012 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

Figure 7. PCB Layout Guide

Layout Consideration

Follow the PCB layout guidelines for optimal performance

of the RT7277

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).

EN

FB

PVCC

SS

VIN

BOOT

GND

SW

GND

2

3

4

5

6

7

8

9

C2

C1

C6

L1

C7

C4

C5

R1

R2

GND

Input capacitor must be placed

as close to the IC as possible.

SW should be connected to inductor by

wide and short trace. Keep sensitive

components away from this trace.

The resistor divider must be connected

as close to the device as possible.

SW node is with high frequency voltage swing and

should be kept at small area. Keep sensitive

components away from the SW node to prevent stray

capacitive noise pickup.

Connect feedback network behind the output capacitors.

Keep the loop area small. Place the feedback

components near the RT7277 feedback pin.

The GND and Exposed Pad should be connected to a

strong ground plane for heat sinking and noise protection.