LTM4604 LINER [Linear Technology], LTM4604 Datasheet - Page 15

• Manufacturer Part Number: LTM4604
• Description: Low Voltage, 4A DC/DC ?ModuleTM with Tracking
• Manufacturer: LINER [Linear Technology]

Safety Considerations
The LTM4604 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 LTM4604 makes the PCB board
layout very simple and easy. However, to optimize its electri-
cal and thermal performance, some layout considerations
are still necessary.
APPLICATIONS INFORMATION
• Use large PCB copper areas for high current path,
• Place high frequency ceramic input and output capacitors
• Place a dedicated power ground layer underneath the
• To minimize the via conduction loss and reduce module
OUT
including V
PCB conduction loss and thermal stress.
next to the V
frequency noise.
unit.
thermal stress, use multiple vias for interconnection
between top layer and other power layers.
. There is no internal fuse. If required, a slow blow fuse
IN
, GND and V
IN
, GND and V
OUT
OUT
. It helps to minimize the
Figure 15. Typical 2.375V to 5.5V Input, 1.5V at 4A Design
pins to minimize high
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
LTM4604
IN
GND
V
V
IN
IN
to
TRACK
V
OUT
FB
Figure14 gives a good example of the recommended
layout.
• Do not put vias directly on the pads unless they are
• SW pads can be soldered to board to improve thermal
capped.
performance.
R
5.69k
0.5%
FB
4604 F15
V
IN
C
22μF ×3
6.3V
X5R OR X7R
REFER TO
TABLE 4
Figure 14. Recommended PCB Layout
OUT
C
IN
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V
1.5V
4A
OUT
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GND
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SW
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V
OUT
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C
C
C
OUT
OUT
OUT
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LTM4604
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GND
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4604 F14
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15
4604f