ltm4619 Linear Technology Corporation, ltm4619 Datasheet - Page 17

• Manufacturer Part Number: ltm4619
• Description: Dual, 26vin, 4a Dc/dc ?module Regulator
• Manufacturer: Linear Technology Corporation

APPLICATIONS INFORMATION
Layout Checklist/Example
The high integration of LTM4619 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, includ-
• Place high frequency ceramic input and output capaci-
• Place a dedicated power ground layer underneath the
ing V
the PCB conduction loss and thermal stress.
tors next to the V
high frequency noise.
unit.
IN
, PGND, V
OUT1
IN
, PGND and V
PGND
and V
OUT2
V
OUT2
C
IN2
. It helps to minimize
OUT
M
K
H
G
D
C
B
A
L
J
F
E
C
1
OUT2
pins to minimize
Figure 17. Recommended PCB Layout
2
3
4
5
TOP VIEW
6
PGND
V
IN
7
• To minimize the via conduction loss and reduce module
• Do not put vias directly on the pad.
• Use a separated SGND ground copper area for com-
• Decouple the input and output grounds to lower the
Figure 17 gives a good example of the recommended
layout.
thermal stress, use multiple vias for interconnections
between top layer and other power layers.
ponents connected to signal pins. Connect the SGND
to PGND underneath the unit.
output ripple noise. Refer to Figure 17.
8
9
10
11
C
OUT1
12
C
IN1
V
OUT1
PGND
LTM4619
17
4619f