LT3598
TYPICAL PERFORMANCE CHARACTERISTICS
SHDN Pin Turn-On Threshold
SHDN Pin Current
Quiescent Current
1.5
50
125°C
6
45
1.4
40
35
–50°C
25°C
5
30
25
20
4
1.3
15
10
5
3
1.2
–50
–25
0
25
50
75
100
125
0
0
5
10
15
20
25
30
35
2
–50
–25
0
25
50
75
100
125
1.240
TEMPERATURE (°C)
Reference Voltage
3598 G01
3.0
V SHDN (V)
Oscillator Frequency
3598 G02
2.8
TEMPERATURE (°C)
Switch Current Limit
3598 G03
1.235
2.5
2.5MHz
2.4
1.230
V IN = 40V
V IN = 30V
2.0
2.0
1.5
1.6
1.225
1.220
V IN = 5V
1.0
0.5
1MHz
1.2
0.8
200kHz
1.215
–50
–25
0
25
50
75
100
125
0
–50
–25
0
25
50
75
100
125
0.4
–50
–25
0
25
50
75
100
125
0.40
0.35
TEMPERATURE (°C)
Switch V CESAT
3598 G04
15.0
TEMPERATURE (°C)
Soft-Start Pin Current
3598 G05
1.24
TEMPERATURE (°C)
Feedback Pin Voltage
3598 G06
0.30
0.25
125°C
25°C
12.5
1.23
V C = 1.5V
0.20
0.15
0.10
–50°C
10.0
7.5
1.22
1.21
V C = 1V
0.05
0
0
0.25
0.50
0.75
1.00
1.25
1.5O
5.0
–50
–25
0
25
50
75
100
125
1.20
–50
–25
0
25
50
75
100
125
SWITCH CURRENT (A)
3598 G07
TEMPERATURE (°C)
3598 G08
TEMPERATURE (°C)
3598 G09
3598fb
5
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