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LTM4609
TYPICAL APPLICATIONS
8
7
6
5
4
3
2
1
8
7
6
5
4
3
2
1
0
25
35
45 55
65
75 85 95
105
0
25
35
45 55
65
75 85 95
105
AMBIENT TEMPERATURE (°C)
AMBIENT TEMPERATURE (°C)
36V IN TO 20V OUT WITH 0LFM
36V IN TO 20V OUT WITH 200LFM
36V IN TO 20V OUT WITH 400LFM
4609 F13
36V IN TO 20V OUT WITH 0LFM
36V IN TO 20V OUT WITH 200LFM
36V IN TO 20V OUT WITH 400LFM
4609 F14
Figure 13. 36V IN to 20V OUT without Heat Sink
APPLICATIONS INFORMATION
Table 4. Boost Mode
Figure 14. 36V IN to 20V OUT with Heat Sink
DERATING CURVE
Figure 7, 9
Figure 7, 9
Figure 7, 9
Figure 8, 10
Figure 8, 10
Figure 8, 10
V OUT (V)
16, 30
16, 30
16, 30
16, 30
16, 30
16, 30
POWER LOSS CURVE
Figure 5
Figure 5
Figure 5
Figure 5
Figure 5
Figure 5
AIR FLOW (LFM)
0
200
400
0
200
400
HEAT SINK
None
None
None
BGA Heat Sink
BGA Heat Sink
BGA Heat Sink
θ JA (°C/W)*
11.4
8.5
7.5
11.0
7.9
7.1
Table 5. Buck Mode
DERATING CURVE
Figure 11, 13
Figure 11, 13
Figure 11, 13
Figure 12, 14
Figure 12, 14
Figure 12, 14
V OUT (V)
12, 20
12, 20
12, 20
12, 20
12, 20
12, 20
POWER LOSS CURVE
Figure 6
Figure 6
Figure 6
Figure 6
Figure 6
Figure 6
AIR FLOW (LFM)
0
200
400
0
200
400
HEAT SINK
None
None
None
BGA Heat Sink
BGA Heat Sink
BGA Heat Sink
θ JA (°C/W)*
8.2
5.9
5.4
7.5
5.3
4.8
HEAT SINK MANUFACTURER
Aavid Thermalloy
Cool Innovations
PART NUMBER
375424B00034G
4-050503P to 4-050508P
WEBSITE
www.aavidthermalloy.com
www.coolinnovations.com
*The results of thermal resistance from junction to ambient θ JA are based on the demo board DC 1198A. Thus, the maximum temperature on board is treated
as the junction temperature (which is in the μModule regulator for most cases) and the power losses from all components are counted for calculations. It
has to be mentioned that poor board design may increase the θ JA .
4609ff
For more information www.linear.com/LTM4609
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