LTC3720 Datasheet, PDF (4/24 Pages) Linear Technology – Single Phase VRM8.5 Current Mode Step-Down Controller

LTC3720
TYPICAL PERFOR A CE CHARACTERISTICS
Current Sense Threshold
vs I_TH Voltage
300
V_RNG = ^2V
200
1.4V
1V
100
0.7V
0.5V
0
–100
–200
0
0.5 1.0 1.5 2.0
I_TH VOLTAGE (V)
2.5 3.0
3720 G01
On-Time vs Temperature
300
I_ION = 30µA
V_VON = 0V
250
200
150
100
50
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3720 G04
Maximum Current Sense
Threshold vs RUN/SS Voltage
150
V_RNG = 1V
125
100
75
50
25
0
1.5
2
2.5
3
RUN/SS VOLTAGE (V)
3.5
3729 G07
4
On-Time vs I_ON Current
10k
V_VON = 0V
1k
100
10
1
10
I_ON CURRENT (µA)
100
3720 G02
Current Limit Foldback
150
V_RNG = 1V
125
100
75
50
25
0
0
0.2
0.4
0.6
0.8
V_FB (V)
3720 G05
Maximum Current Sense
Threshold vs Temperature
150
V_RNG = 1V
140
130
120
110
100
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3720 G08
On-Time vs V_ON Voltage
1000
I_ION = 30µA
800
600
400
200
0
0
1
2
3
V_ON VOLTAGE (V)
3720 G02
Maximum Current Sense
Threshold vs V_RNG Voltage
300
250
200
150
100
50
0
0.5 0.75 1.0 1.25 1.5 1.75 2.0
V_RNG VOLTAGE (V)
3720 G06
Feedback Reference Voltage
vs Temperature
0.82
0.81
0.80
0.79
0.78
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3720 G09
3720f