Datasheet

LTM4624
20
4624fb
For more information www.linear.com/LTM4624
APPLICATIONS INFORMATION
Figure 19. Recommended PCB Layout
V
IN
C
OUT
V
OUT
4624 F19
GND
C
IN
R
FB
Safety Considerations
The LTM4624 modules do not provide galvanic isolation
from V
IN
to V
OUT
. There is no internal fuse. If required,
a slow blow fuse with a rating twice the maximum input
current needs to be provided to protect each unit from
catastrophic failure. The device does support thermal
shutdown and over current protection.
Layout Checklist/Example
The high integration of LTM4624 makes the PCB board
layout very simple and easy. However, to optimize its electri
-
cal and thermal performance, some layout considerations
are still necessar
y
.
Use large PCB copper areas for high current paths,
including V
IN
, GND and V
OUT
. It helps to minimize the
PCB conduction loss and thermal stress.
Place high frequency ceramic input and output capaci-
tors next to the V
IN
, PGND and V
OUT
pins to minimize
high frequency noise.
Place a dedicated power ground layer underneath the
unit.
To minimize the via conduction loss and reduce module
thermal stress, use multiple vias for interconnection
between top layer and other power layers.
Do not put via directly on the pad, unless they are
capped or plated over.
Use a separated SGND ground copper area for com
-
ponents connected to signal pins. Connect the SGND
to GND underneath the unit.
Bring out test points on the signal pins for monitoring.
Figure 19 gives a good example of the recommended layout.