LTC3731 Datasheet, PDF (7/32 Pages) Linear Technology – 3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller

TYPICAL PERFOR A CE CHARACTERISTICS
Short-Circuit Arming and Latchoff
vs Temperature
5
ARMING
4
3 ^LATCHOFF
2
1
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3731 G10
Maximum I_SENSE vs V_RUN/SS
80
70
60
50
40
30
20
10
0
0
1
2
3
4
5
6
V_RUN/SS VOLTAGE (V)
3731 G13
Percentage of Nominal Output vs
Peak I_SENSE (Foldback)
80
70
60
50
40
30
20
10
0
0 10 20 30 40 50 60 70 80 90 100
PERCENTAGE OF NOMINAL OUTPUT VOLTAGE (%)
3731 G16
Supply Current vs Temperature
100
2.8 ^VCC ^{= 5V}
2.4
80
2.0
60
1.6
1.2
40
0.8
20
0.4
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
0
100 125
3731 G11
Maximum Current Sense
Threshold vs Duty Factor
75
50
25
0
0
20
40
60
80
100
DUTY FACTOR (%)
3731 G14
Maximum Duty Factor vs
Temperature
100
V_PLLFLTR = 0V
98
96
94
92
90
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3731 G17
LTC3731
RUN/SS Pull-Up Current vs
Temperature
2.5
V_RUN/SS = 1.9V
2.0
1.5
1.0
0.5
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3731 G12
Peak Current Threshold vs V_ITH
75
60
45
30
15
0
–15
0
0.6
1.2
1.8
2.4
V_ITH (V)
3731 G15
I_SENSE Pin Current vs V_OUT
40
30
20
10
0
–10
–20
–30
0
1
2
3
4
5
V_OUT (V)
3731 G18
3731fa
7