LTC3819 Datasheet, PDF (6/32 Pages) Linear Technology – 2-Phase, High Efficiency, Step-Down Controller for Sun Server CPUs

LTC3819
TYPICAL PERFOR A CE CHARACTERISTICS
Maximum Current Sense Threshold
vs V_RUN/SS (Soft-Start)
80
60
40
20
V_SENSE(CM) = 1.4125V
0
01
2
3
4
V_RUN/SS (V)
5
6
3819 G10
Load Regulation
0.0
–0.1
FCB = 0V
V_IN = 15V
FIGURE 1
–0.2
–0.3
–0.4
0
5
10
15
20
25
LOAD CURRENT (A)
3819 G13
Maximum Current Sense
Threshold vs Temperature
80
78
76
74
72
70
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3819 G16
Maximum Current Sense Threshold
vs Sense Common Mode Voltage
80
76
72
68
64
60
0
1
2
COMMON MODE VOLTAGE (V)
3819 G11
V_ITH vs V_RUN/SS (Soft-Start)
2.5
2.0
1.5
1.0
0.5
0
012
3
4
V_RUN/SS (V)
56
3819 G14
Current Sense Threshold
vs I_TH Voltage
90
80
70
60
50
40
30
20
10
0
–10
–20
–30
0
0.5
1
1.5
2
2.5
V_ITH (V)
3819 G12
SENSE Pins Total Source Current
100
50
0
–50
–100
0
1
2
V_SENSE COMMON MODE VOLTAGE (V)
3819 G15
RUN/SS Current vs Temperature
1.8
Soft-Start Up (Figure 12)
1.6
V_ITH
1.4
1V/DIV
1.2
V_OUT
1.0
1V/DIV
0.8
V_RUN/SS
2V/DIV
0.6
0.4
0.2
100ms/DIV
3718 G18
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3819 G17
3819f
6