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XR76203 Datasheet, PDF (11/20 Pages) Exar Corporation – 3A/5A/8A Synchronous Step Down COT Regulator
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XR76203/5/8
Efficiency
Unless otherwise noted: TAMBIENT = 25°C, No Air flow, f=400kHz, Inductor losses are included, Schematic from the applica-
tion information section.
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0.1
3.3uH
2.2uH
1.5uH
5.0V DCM
3.3V DCM
1.8V DCM
1.0
5.0V CCM
3.3V CCM
1.8V CCM
10.0
IOUT (A)
Figure 19: XR76208 efficiency, VIN=12V
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0.1
200kHz, 8.2uH
3.3uH
2.2uH
1.5uH
12V DCM
5.0V DCM
3.3V DCM
1.8V DCM
1.0
12V CCM
5.0V CCM
3.3V CCM
1.8V CCM
10.0
IOUT (A)
Figure 20: XR76208 efficiency, VIN=24V
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0.1
4.7uH
3.3uH
2.2uH
5.0V DCM
3.3V DCM
1.8V DCM
1.0
5.0V CCM
3.3V CCM
1.8V CCM
10.0
IOUT (A)
Figure 21: XR76205 efficiency, VIN=12V
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0.1
200kHz 6.8uH
4.7uH
3.3uH
12V DCM
5.0V DCM
3.3V DCM
1.8V DCM
1.0
2.2uH
12V CCM
5.0V CCM
3.3V CCM
1.8V CCM
10.0
IOUT (A)
Figure 22: XR76205 efficiency, VIN=24V
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0.1
6.8uH
4.7uH
3.3uH
5.0V DCM
3.3V DCM
1.8V DCM
1.0
5.0V CCM
3.3V CCM
1.8V CCM
10.0
IOUT (A)
Figure 23: XR76203 efficiency, VIN=12V
100
98
96
94
92
90
88
86
84
82
80
78
76
74
72
70
0.1
200kHz
10uH
6.8uH
4.7uH
3.3uH
12V DCM
5.0V DCM
3.3V DCM
1.8V DCM
1.0
12V CCM
5.0V CCM
3.3V CCM
1.8V CCM
10.0
IOUT (A)
Figure 24: XR76203 efficiency, VIN=24V
© 2015 Exar Corporation
11 / 20
exar.com/XR76203/5/8
Rev 1A
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