RT6248B
Layout Considerations
The LX node encounters high frequency voltage swings
so it should be kept in a small area. Keep sensitive
components away from the LX node to prevent stray as
possible.
Layout is very important in high frequency switching
converter design. The PCB can radiate excessive noise
and contribute to converter instability with improper layout.
Certain points must be considered before starting a layout
using the IC.
The GND pin should be connected to a strong ground
plane for heat sinking and noise protection.
Make traces of the high current paths as short and wide
Avoid using vias in the power path connections that have
switched currents (from CIN toGNDand CIN to VIN) and
the switching node (LX).
as possible.
Put the input capacitor as close as possible to the device
pins (VINandGND).
An example of PCB layout guide is shown in Figure 3 for
reference.
R1
R2
The optional compensation
Compensation components
must be connected as close
C
(opt.)
GND
FF
to the IC as possible.
C
D
BYS
C
VCC
GN
V
VCC
LX should be connected to
inductor by wide and short
trace.
The input capacitor
must be placed as
close to the IC as
possible
12 11 10
1
9
8
7
Keep sensitive components
BOOT
6
EN
away from this trace.
5
VIN
V
OUT
L
LX
LX
2
3
V
IN
C
IN
4
PGND
GND
C
OUT
The output capacitor must
be placed near the IC
Figure 3. PCB Layout Guide
Copyright 2018 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS6248B-01 May 2018
www.richtek.com
15
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