Derating Curves - Analog Devices Linear ADI Power LTM4681 Manual

LTM4681
APPLICATIONS INFORMATION-DERATING CURVES

DERATING CURVES

25
0.9V, 250kHz
1.0V, 250kHz
1.2V, 350kHz
20
1.5V, 425kHz
1.8V, 500kHz
2.5V, 575kHz
15
3.3V, 650kHz
10
5
0
0 10 20 30 40 50 60 70 80 90
OUTPUT CURRENT (A)
Figure 35. 5V Power Loss Curve
IN
140
120
100
80
60
40
0LFM
20
200LFM
400LFM
0
0 20 40 60 80
AMBIENT TEMPERATURE (°C)
Figure 38. 5V to 0.9V
IN OUT
Derating Curve, No Heatsink
76
25
0.9V, 250kHz
1.0V, 250kHz
1.2V, 350kHz
20
1.5V, 425kHz
1.8V, 500kHz
2.5V, 575kHz
15
3.3V, 650kHz
10
5
0
0 10 20
100 110 120 130
4681 F35
Figure 36. 8V
140
120
100
80
60
40
0LFM
20
200LFM
400LFM
0
0 20
100 120
AMBIENT TEMPERATURE (°C)
4681 F38
Figure 39. 8V
Curve, No Heatsink
For more information
30 40 50 60 70 80 90 100 110 120 130
OUTPUT CURRENT (A)
4681 F36
Power Loss Curve
IN
40 60 80 100 120
4681 F39
to 0.9V Derating
IN OUT
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25
0.9V, 250kHz
1.0V, 250kHz
1.2V, 350kHz
20
1.5V, 425kHz
1.8V, 500kHz
2.5V, 575kHz
15
3.3V, 650kHz
10
5
0
0 10 20 30 40 50 60 70 80 90
OUTPUT CURRENT (A)
Figure 37. 12V Power Loss Curve
IN
140
120
100
80
60
40
0LFM
20
200LFM
400LFM
0
0 20 40 60 80
AMBIENT TEMPERATURE (°C)
Figure 40. 12V to 0.9V
IN OUT
Curve, No Heatsink
100 110 120 130
4681 F37
100 120
4681 F40
Derating
Rev. A