AMD Mobile Serial VID Dual-Phase
Fixed-Frequency Controller
Typical Operating Characteristics
(Circuit of Figure 2, V IN = 12V, V DD = V CC = 5V, V DDIO = 2.5V, T A = +25°C, unless otherwise noted.)
100
95
90
85
80
75
1-PHASE EFFICIENCY vs. LOAD CURRENT
(V OUT = 1.2125V)
100
95
90
85
80
75
2-PHASE EFFICIENCY vs. LOAD CURRENT
(V OUT = 1.2125V)
1-PHASE OUTPUT VOLTAGE vs. LOAD CURRENT
(V OUT = 1.2125V, -1.2mV/A DROOP)
1.25
1.23
1.21
1.19
70
65
V IN = 7V
V IN = 12V
70
65
V IN = 7V
V IN = 12V
1.17
60
V IN = 20V
60
V IN = 20V
1.15
V IN = 12V
0.1
1
10
100
0.1
10
100
0
5
10
15
20
LOAD CURRENT (A)
1-PHASE OUTPUT VOLTAGE vs. LOAD CURRENT
(V OUT = 1.2000V, NO DROOP)
1.25
1.23
1.21
1.19
100
95
90
85
80
75
LOAD CURRENT (A)
1-PHASE EFFICIENCY vs. LOAD CURRENT
(V OUT = 0.8000V)
100
95
90
85
80
75
LOAD CURRENT (A)
2-PHASE EFFICIENCY vs. LOAD CURRENT
(V OUT = 0.8000V)
1.17
70
65
V IN = 7V
V IN = 12V
70
65
V IN = 7V
V IN = 12V
1.15
V IN = 12V
60
V IN = 20V
60
V IN = 20V
0
5
10
15
20
0.1
1
10
100
0.1
10
100
LOAD CURRENT (A)
1-PHASE OUTPUT VOLTAGE vs. LOAD CURRENT
(V OUT = 0.8000V, -1.2mV/A DROOP)
0.84
350
LOAD CURRENT (A)
1-PHASE SWITCHING FREQUENCY
vs. LOAD CURRENT
29
LOAD CURRENT (A)
MAXIMUM INDUCTOR CURRENT
vs. INPUT VOLTAGE
0.83
V OUT = 1.2V
PEAK CURRENT
DC CURRENT
0.82
0.81
0.80
0.79
0.78
0.77
300
250
200
27
25
23
0.76
150
V IN = 7V
21
0.75
0.74
V IN = 12V
100
V IN = 12V
V IN = 20V
19
0
5
10
15
20
0.1
1
10
100
5
10
15
20
25
LOAD CURRENT (A)
LOAD CURRENT (A)
INPUT VOLTAGE (V)
______________________________________________________________________________________
11
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