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LTM4615
APPLICATIONS INFORMATION
Safety Considerations
The LTM4615 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 LTM4615 makes the PCB board
layout very simple and easy. However, to optimize its electri-
cal and thermal performance, some layout considerations
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.
GND1 CONTROL
C IN1
? 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 via directly on pads unless the via is capped.
Figure 11 gives a good example of the recommended layout.
V OUT1
GND1
M
L
C OUT1 C OUT2 V
OUT1
LD0_IN IN2
SW1
V IN1
GND1
GND3
C
K
J
H
G
F
C OUT3
GND1
LDO_OUT
GND3
CONTROL
GND2
V IN2
E
D
C
C OUT4 C OUT5
V OUT2
B
GND2
A
GND2
C IN3
1
2
3
4
5
6
7
8
9
10 11 12
GND2
SW2
GND2
4615 F11
Figure 11. Recommended PCB Layout
18
For more information www.linear.com/LTM4615
4615fb
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