Datasheet

LTM4608A
20
4608afd
applicaTions inForMaTion
Figure 17. Recommended PCB Layout
Safety Considerations
The LTM4608A modules do not provide 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.
Layout Checklist/Example
The high integration of LTM4608A makes the PCB board
layout very simple and easy. However, to optimize its
electrical and thermal performance, some layout con-
siderations are still necessary.
• Use large PCB copper areas for high current path,
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
, GND 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viasdirectlyonthepads,unlesstheyare
capped.
• UseaseparatedSGNDgroundcopperareaforcom-
ponents connected to signal pins. Connect the SGND
to GND underneath the unit.
Figure 17 gives a good example of the recommended layout.
GND
GND
GND
4608A F17
C
IN
C
OUT
C
OUT
C
OUT
C
IN
V
IN
V
OUT