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DSQ2102A-QA-00 June 2017 www.richtek.com
RTQ2102A-QA
©
Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Layout Considerations
Follow the PCB layout guidelines for optimal performance
of the RTQ2102A-QA.
Connect the terminal of the input capacitor(s), C
IN
, as
close as possible to the VIN pin. This capacitor provides
the AC current into the internal power MOSFETs.
LX node experiences high frequency voltage swing and
should be kept within a small area. Keep all sensitive
small-signal nodes away from the LX node to prevent
stray capacitive noise pick up.
Figure 3. PCB Layout Guide
Flood all unused areas on all layers with copper. Flooding
with copper will reduce the temperature rise of power
components. Connect the copper areas to any DC net
(V
IN
, V
OUT
, GND, or any other DC rail in the system).
Connect the FB pin directly to the feedback resistors.
The resistive voltage divider must be connected between
V
OUT
and GND.
EN
FB
PGND
VIN
LX
PGOOD
VOS
AGND
7
6
5
1
2
3
4
8
PGND
9
C
IN
C
IN
V
IN
C
OUT
C
OUT
V
OUT
V
OUT
GND
R1
R2
L
The feedback and must be connected as close to the
device as possible. Keep sensitive component away.
Input capacitor must be placed
as close to the IC as possible.
LX should be connected to inductor by
wide and short trace. Keep sensitive
components away from this trace
