LTC3811_15 Datasheet, PDF (9/48 Pages) Linear Technology – High Speed Dual, Multiphase Step-Down DC/DC Controller

TYPICAL PERFORMANCE CHARACTERISTICS
LTC3811
Current Sense Threshold vs
COMP Pin Voltage
100
RNG = 2V
80
60
RNG = INTV_CC
40
RNG = 0V
20
0
–20
–40
–60
–80
0
0.5 1 1.5 2 2.5 3
COMP PIN VOLTAGE (V)
3811 G28
Foldback Current Limit
60
55
50
45
40
35
30
25
20
15
10
RNG = INTV_CC
5
0
0 100 200 300 400 500 600 700
FB VOLTAGE (mV)
3811 G31
SENSE Pin Current vs
Temperature
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
3811 G34
Maximum SENSE Pin Voltage vs
Temperature
100
90
80
RNG = 2V
70
60
50
RNG = INTV_CC
40
30
RNG = 0V
20
10
0
–50 –30 –10 10 30 50 70 90 110 130
TEMPERATURE (°C)
3811 G29
Maximum SENSE Pin Threshold
vs Duty Cycle
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
3811 G32
Maximum SENSE Pin Threshold
vs Common Mode Voltage
55
54
53
52
51
RNG = INTV_CC
50
49
48
47
46
45
0 0.5 1 1.5 2 2.5 3 3.5 4
COMMON MODE VOLTAGE (V)
3811 G35
Maximum Current Sense
Threshold vs V_RNG Voltage
90
80
70
60
50
40
30
20
10
0
0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9
V_RNG VOLTAGE (V)
3811 G30
SENSE Pin Current vs
Common Mode Voltage
2.5
2.0
1.5
1.0
0.5
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
COMMON MODE VOLTAGE (V)
3811 G33
Frequency vs PLL/LPF Pin
Voltage
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
0
0.5
1
1.5
2
PLL/LPF PIN VOLTAGE (V)
2.5
3811 G36
3811f
9