Datasheet

LTM4615
18
4615fb
For more information www.linear.com/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.
• 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.
M
C
IN1
GND1
CONTROL
GND2
SW2
GND1
V
IN1
GND1
SW1
CONTROL
LD0_IN
GND3
GND2
GND2 GND2
GND3
GND1
LDO_OUT
V
OUT2
V
OUT1
V
IN2
GND2
4615 F11
V
OUT1
L
K
J
H
G
F
E
D
C
B
A
1 2 3 4 5 6 7 8 9 10 11 12
C
IN3
C
OUT4
C
OUT5
C
OUT1
C
OUT2
C
OUT3
C
IN2
Figure 11. Recommended PCB Layout