ltm4604a Linear Technology Corporation, ltm4604a Datasheet - Page 15

• Manufacturer Part Number: ltm4604a
• Description: Low Voltage, 4a Dc/dc ?module With Tracking
• Manufacturer: Linear Technology Corporation

Safety Considerations
The LTM4604A modules do not provide isolation from
V
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 LTM4604A makes the PCB board
layout very simple and easy. However, to optimize its
electrical and thermal performance, some layout consid-
erations are still necessary.
APPLICATIONS INFORMATION
• Use large PCB copper areas for high current path,
IN
V
including V
PCB conduction loss and thermal stress.
IN
to V
OUT
C
. There is no internal fuse. If required, a slow
IN
Figure 14. Recommended PCB Layout
IN
, GND and V
GND
OUT
. It helps to minimize the
V
OUT
C
C
C
OUT
OUT
OUT
GND
4604A F14
Figure 14 gives a good example of the recommended
layout.
• 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 vias directly on the pads unless they are
• SW pads can be soldered to board to improve thermal
tors next to the V
high frequency noise.
unit.
thermal stress, use multiple vias for interconnection
between top layer and other power layers.
capped.
performance.
Figure 15. Typical 2.375V to 5.5V Input, 1.5V at 4A Design
OPEN-DRAIN
C
0.01μF
SSEXT
PULL UP
X5R OR X7R
10μF
6.3V
C
IN
PGOOD
COMP
RUN/SS
2.375V TO 5.5V
IN
LTM4604A
, GND and V
GND
V
V
IN
IN
TRACK
V
OUT
FB
OUT
R
5.69k
LTM4604A
FB
pins to minimize
4604A F15
C
22μF ×3
6.3V
X5R OR X7R
OUT
V
1.5V
4A
OUT
15
4604af