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LTM4601/LTM4601-1

4601f

APPLICATIO S I FOR ATIO

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 LTM4601 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 LTM4601 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, 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.

• 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.

SIGNAL

GND

VOUT

VIN

GND

COUT

CIN

COUT

4601 F15

Figure 15. Recommended Layout

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