LTM4601AV-1 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTM4601AV-1' PDF : 28 Pages View PDF
LTM4601A/LTM4601A-1
APPLICATIONS INFORMATION
Tables 3 and 4 provide a summary of the equivalent θJA
for the noted conditions. These equivalent θJA parameters
are correlated to the measured values, and are improved
with air flow. The case temperature is maintained at 100°C
or below for the derating curves. The maximum case
temperature of 100°C is to allow for a rise of about 13°C
to 25°C inside the μModule with a thermal resistance θJC
from junction to case between 6°C/W to 9°C/W. This will
maintain the maximum junction temperature inside the
μModule below 125°C.
Safety Considerations
The LTM4601A modules do not provide isolation from
VIN to VOUT. 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 LTM4601A makes the PCB board
layout very simple and easy. However, to optimize its
electrical and thermal performance, some layout consid-
erations are still necessary.
• Use large PCB copper areas for high current path, in-
cluding VIN, PGND and VOUT. It helps to minimize the
PCB conduction loss and thermal stress.
• Place high frequency ceramic input and output capaci-
tors next to the VIN, PGND and VOUT pins to minimize
high frequency noise.
• Place a dedicated power ground layer underneath the
unit. Refer frequency synchronization source to power
ground.
• To minimize the via conduction loss and reduce module
thermal stress, use multiple vias for interconnection
between top layer and other power layers.
• Do not put vias directly on pads unless they are capped.
• Use a separated SGND ground copper area for com-
ponents connected to signal pins. Connect the SGND
to PGND underneath the unit.
Figure 15 gives a good example of the recommended
layout.
VIN
CIN
•••
CIN
•••
•
•
•
•
•
•
•
•
•
•
•
•
CONTROL
•••••• ••
••
PGND
••••••• •
••••
••••
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•••••••••
•••••••••••
•••• •••• • • • • • • • • • • •
COUT COUT • • • • • • • • • • •
•••••••••••
VOUT
4601A F15
CONTROL
SIGNAL
GND
CONTROL
Figure 15. Recommended Layout
4601afb
19
Share Link: 
