LTC3642
TYPICAL PERFORMANCE CHARACTERISTICS
Switch On-Resistance vs
Input Voltage
Switch On-Resistance vs
Temperature
Switch Leakage Current vs
Temperature
0.6
0.5
0.4
0.3
0.2
0.1
0
5
4
3
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
= 45V
V
= 10V
IN
IN
TOP
TOP
SW = 0V
BOTTOM
2
1
0
BOTTOM
SW = 45V
–40
–10
20
50
80
110
–40
–10
20
50
80
110
0
40
50
10
20
30
TEMPERATURE (°C)
TEMPERATURE (°C)
V
VOLTAGE (V)
IN
3642 G12
3642 G11
3642 G10
Run Comparator Thresholds vs
Temperature
Internal Soft-Start Time vs
Temperature
Efficiency vs Input Voltage
1.30
1.25
1.20
1.15
1.10
1.05
1.00
95
90
1.20
1.15
1.10
1.05
1.00
0.95
0.90
FIGURE 10 CIRCUIT
I
OPEN
SET
RISING
I
= 50mA
LOAD
85
80
I
= 10mA
LOAD
I
= 1mA
LOAD
FALLING
75
70
65
–40
20
50
80
110
–10
10
15
20
25
30
35
40
45
–40
20
50
80
110
–10
TEMPERATURE (°C)
INPUT VOLTAGE (V)
TEMPERATURE (°C)
3642 G14
3642 G13
3642 G15
Soft-Start Waveforms
Operating Waveforms
Load Step Transient Response
OUTPUT
VOLTAGE
50mV/DIV
OUTPUT
VOLTAGE
25mV/DIV
OUTPUT
VOLTAGE
1V/DIV
SWITCH
VOLTAGE
5V/DIV
LOAD
CURRENT
25mA/DIV
INDUCTOR
CURRENT
50mA/DIV
INDUCTOR
CURRENT
50mA/DIV
4632 G16
4632 G17
4632 G18
V
C
SET
= 10V
= 0.047ꢀF
OPEN
500ꢀs/DIV
V
SET
= 10V
10ꢀs/DIV
V
SET
= 10V
OPEN
1ms/DIV
IN
SS
IN
IN
I
OPEN
I
I
FIGURE 10 CIRCUIT
FIGURE 10 CIRCUIT
FIGURE 10 CIRCUIT
3642f
5
Linear [ Linear ]
