LTM4614
APPLICATIONS INFORMATION
Safety Considerations
The LTM4614 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.
Layout Checklist/Example
The high integration of LTM4614 makes the PCB board
layout very simple and easy. However, to optimize its
electrical and thermal performance, some layout consid-
erations are still necessary.
?  Refer to http://www.linear.com/docs/29812 for device
land pattern and stencil design.
?  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 , 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 the top layer and other power layers.
?  Do not put vias directly on pads unless they are capped.
Figure 11 gives a good example of the recommended layout.
GND1
I/O PINS
V OUT1
GND1
V IN1
GND1
GND2
V IN2
M
C IN1 L
K
J
H
G
F
C IN2 E
D
C
C OUT1 C OUT2
C OUT3 C OUT4
V OUT1
GND1
V OUT2
B
GND2
A
1
2
3
4
5
6
7
8
9
10 11 12
GND2
GND2
I/O PINS
GND2
4614 F11
Figure 11. Recommended PCB Layout
4614fb
14
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