LTC3630A
19
3630afc
For more information www.linear.com/LTC3630A
applicaTions inForMaTion
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC3630A. Check the following in your layout:
1. Large switched currents flow in the power switches and
input capacitor. The loop formed by these components
should be as small as possible. A ground plane is rec
-
ommended to minimize ground impedance.
2.
Connect the (+) terminal of the input capacitor, C
IN
, as
close as possible to the V
IN
pin. This capacitor provides
the AC current into the internal power MOSFETs.
3. Keep the switching node, SW, away from all sensitive
small signal nodes. The rapid transitions on the switching
node can couple to high impedance nodes, in particular
V
FB
, and create increased output ripple.
4. Flood all unused area on all layers with copper except
for the area under the inductor. Flooding with copper
will reduce the temperature rise of power components.
You can connect the copper areas to any DC net (V
IN
,
V
OUT
, GND, or any other DC rail in your system).
V
FB
I
SET
SW
L1
V
IN
RUN
R3
R1
R2
C
IN
C
OUT
V
OUT
IN
R4
R
ISET
C
ISET
C
SS
3630a
FBO
SS
V
PRG2
V
PRG1
LTC3630A
VIAS TO GROUND PLANE
OUTLINE OF LOCAL GROUND PLANE
V
OUT
V
IN
GND
GND
L1
C
OUT
C
IN
Figure 12. Example PCB Layout
