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LTM8045 Datasheet(PDF) 20 Page - Linear Technology

Part # LTM8045
Description  10A Step-Down DC/DC 關Module Regulator
PDF  30 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTM8045 Datasheet(HTML) 20 Page - Linear Technology

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LTM4649
20
4649fc
For more information www.linear.com/LTM4649
Figure 9. 5VIN, 3.3VOUT and
1.5VOUT Power Loss
Figure 10. 12VIN, 3.3VOUT
and 1.5VOUT Power Loss
APPLICATIONS INFORMATION
Figure 11. No Heat Sink with 5VIN
to 1.5VOUT
Figure 12. No Heat Sink with
12VIN to 1.5VOUT
Figure 13. No Heat Sink with
5VIN to 3.3VOUT
Figure 14. No Heat Sink with
12VIN to 3.3VOUT
no airflow or heat sinking in a properly defined chamber.
This
θJB + θBA value is shown in the Pin Configuration
section and should accurately equal the
θJA value because
approximately 100% of power loss flows from the junc-
tion through the board into ambient with no airflow or top
mounted heat sink.
The 5VIN and 12VIN power loss curves in Figures 9 and 10
can be used in coordination with the load current derating
curves in Figures 11 to 14 for calculating an approximate
θJA thermal resistance for the LTM4649 with various
heat sinking and airflow conditions. The power loss
curves are taken at room temperature, and are increased
with a multiplicative factor according to the ambient
temperature. This approximate factor is: 1.4 for 120°C.
The derating curves are plotted with the output current
starting at 10A and the ambient temperature at 40°C. The
output voltages are 1.5V and 3.3V. These are chosen to
include the lower and higher output voltage ranges for
correlating the thermal resistance. Thermal models are
derived from several temperature measurements in a
controlled temperature chamber along with thermal mod-
eling analysis. The junction temperatures are monitored
LOAD CURRENT (A)
0
0
0.5
1.0
1.5
2.0
2.5
3.0
2
4
6
8
4649 F09
10
VOUT = 3.3V
VOUT = 1.5V
LOAD CURRENT (A)
0
0
0.5
1.0
1.5
2.0
2.5
3.0
2
4
6
8
4649 F10
10
VOUT = 3.3V
VOUT = 1.5V
AMBIENT TEMPERATURE (°C)
0
0
2
4
6
8
12
20
40
60
80
4649 F11
100
120
10
400LFM
200LFM
0LFM
AMBIENT TEMPERATURE (°C)
0
0
2
4
6
8
12
20
40
60
80
4649 F12
100
120
10
400LFM
200LFM
0LFM
AMBIENT TEMPERATURE (°C)
0
0
2
4
6
8
12
20
40
60
80
4649 F13
100
120
10
400LFM
200LFM
0LFM
AMBIENT TEMPERATURE (°C)
0
0
2
4
6
8
12
20
40
60
80
4649 F14
100
120
10
400LFM
200LFM
0LFM



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