LTM4622A datasheet(21/30 Pages) LINER

21 / 30 page

LTM4622A

Rev B

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APPLICATIONS INFORMATION

Figure 24 and Figure 25 show measured temperature

picture of the LTM4622A with no heat sink from 12V

input down to 3.3V and 5V output with 2A DC current on

each and from 12V down to 5V and 8V output with 2A

DC current on each. Both without heat sink and airflow.

SAFETY CONSIDERATIONS

The LTM4622A modules do not provide galvanic 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. The device does support thermal

shutdown and over current protection.

and without airflow. The derived thermal resistances in

Tables 2 to 6 for the various conditions can be multiplied

by the calculated power loss as a function of ambient

temperature to derive temperature rise above ambient,

thus maximum junction temperature. Room temperature

power loss can be derived from the efficiency curves in

the Typical Performance Characteristics section and ad-

justed with the above ambient temperature multiplicative

factors. The printed circuit board is a 1.6mm thick four

layer board with two ounce copper for the two outer layers

and one ounce copper for the two inner layers. The PCB

dimensions are 95mm × 76mm.

LTM4622A Datasheet(PDF) 21 Page - Linear Technology