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XR79120 Datasheet, PDF (11/19 Pages) Exar Corporation – 22V, 20A Synchronous Step Down COT Power Module
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XR79120
Efficiency and Package Thermal Derating
Unless otherwise noted: TAMBIENT = 25°C, No Air flow, f=500kHz, Schematic from the application information section.
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0.1
1.8V DCM
1.5V DCM
1.2V DCM
1.0V DCM
1.0
1.8V CCM
1.5V CCM
1.2V CCM
1.0V CCM
10.0
IOUT (A)
Figure 19: Efficiency, VIN=5V
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0.1
3.3V DCM
2.5V DCM
1.8V DCM
1.5V DCM
1.2V DCM
1.0V DCM
3.3V CCM
2.5V CCM
1.8V CCM
1.5V CCM
1.2V CCM
1.0V CCM
600kHz
1.0
10.0
IOUT (A)
Figure 21: Efficiency, VIN=12V
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0.1
1.8V DCM
1.2V DCM
1.8V CCM
1.2V CCM
1.0
10.0
IOUT (A)
Figure 23: Efficiency, VIN=19.6V
130
120
110
100
90
80
1.0 VOUT
1.2 VOUT
70
1.8 VOUT
60
50
40
30
2 4 6 8 10 12 14 16 18 20
IOUT (A)
Figure 20: Maximum TAMBIENT vs IOUT, VIN=5V
130
120
110
100
90
600kHz
80
1.0 VOUT
70
1.2 VOUT
1.8 VOUT
60
3.3 VOUT
50
40
30
2 4 6 8 10 12 14 16 18 20
IOUT (A)
Figure 22: Maximum TAMBIENT vs IOUT, VIN=12V
130
120
110
100
90
80
70
1.2 VOUT
60
1.8 VOUT
50
40
30
2 4 6 8 10 12 14 16 18 20
IOUT (A)
Figure 24: Maximum TAMBIENT vs IOUT, VIN=19.6V
© 2014 Exar Corporation
11 / 19
exar.com/XR79120
Rev 1A
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