ltm4615 Linear Technology Corporation, ltm4615 Datasheet - Page 18

• Manufacturer Part Number: ltm4615
• Description: Triple Output, Low Voltage Dc/dc ?module Regulator
• Manufacturer: Linear Technology Corporation

LTM4615
APPLICATIONS INFORMATION
Safety Considerations
The LTM4615 modules do not provide isolation from V
V
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,
18
OUT
including V
PCB conduction loss and thermal stress.
. There is no internal fuse. If required, a slow blow fuse
IN
, GND and V
CONTROL
SW1
OUT
LD0_IN
GND1
GND1
GND3
GND2
GND2
V
V
IN1
IN2
. It helps to minimize the
C
IN2
C
C
IN3
IN1
M
L
K
H
G
D
J
F
E
C
B
A
1
Figure 11. Recommended PCB Layout
2
3
GND1 CONTROL
GND2
4
IN
5
SW2
to
6
7
• Place high frequency ceramic input and output capaci-
• Place a dedicated power ground layer underneath the
• To minimize the via conduction loss and reduce module
• Do not put via directly on pads unless the via is
Figure 11 gives a good example of the recommended
layout.
8
tors next to the V
high frequency noise.
unit.
thermal stress, use multiple vias for interconnection
between the top layer and other power layers.
capped.
9
10 11 12
GND2
V
OUT1
C
C
OUT1
OUT4
C
OUT3
IN
C
C
OUT2
OUT5
, GND and V
4615 F11
V
GND1
LDO_OUT
GND3
V
GND2
OUT1
OUT2
OUT
pins to minimize
4615f