Datasheet

LT3518
5
3518fe
TYPICAL PERFORMANCE CHARACTERISTICS
V
ISP
– V
ISN
Threshold vs V
CTRL
Switch Current Limit
vs Duty Cycle
Oscillator Frequency vs R
T
V
ISP
– V
ISN
Threshold
vs Temperature
Switch Current Limit
vs Temperature
Oscillator Frequency
vs Temperature
V
CTRL
(V)
0
0
V
ISP
– V
ISN
THRESHOLD (mV)
20
40
60
80
0.4 0.8
1.2
1.6
3518 G01
100
120
0.2 0.6
1.0
1.4
V
IN
= 5V
V
ISP
= 24V
VC = 1V
T
A
= 25°C
DUTY CYCLE (%)
0
0
CURRENT LIMIT (A)
0.5
1.0
1.5
2.0
2.5
3.0
20 40 60 80
3518 G02
100
T
A
= 25°C
R
T
(kΩ)
1
100
OSCILLATOR FREQUENCY (kHz)
1000
10000
10 100
3518 G03
T
A
= 25°C
TEMPERATURE (°C)
–40
V
ISP
– V
ISN
THRESHOLD (mV)
103
20
3518 G04
100
98
–20 0 40
97
96
104
102
101
99
60 80 100 120 140 160
V
IN
= 5V
V
ISP
= 24V
VC = 1V
V
CTRL
= 2V
TEMPERATURE (°C)
–40 –15
2.0
CURRENT LIMIT (A)
2.4
3.0
–10
60
85
3518 G05
2.2
2.8
2.6
35
110 135 160
V
IN
= 5V
TEMPERATURE (°C)
–40 –20
1.5
OSCILLATOR FREQUENCY (MHz)
1.9
2.5
0
40
60
3518 G06
1.7
2.3
2.1
20
80
160100 120 140
V
IN
= 5V
R
T
= 6.04k
Reference Voltage
vs Temperature
V
ISP
– V
ISN
Threshold vs V
ISP
V
ISP
(V)
0
V
ISP
– V
ISN
THRESHOLD (mV)
101
103
105
40
3518 G07
99
97
100
102
104
98
96
95
10
20
30
50
V
CTRL
= 2V
V
IN
= 5V
T
A
= 25°C
VC = 1V
TEMPERATURE (°C)
–40
1.98
V
REF
(V)
1.99
2.00
2.01
2.02
–20 0 20 40
3518 G08
60 80 100 120 140 160
V
IN
= 5V
Quiescent Current vs V
IN
V
IN
(V)
0
V
IN
CURRENT (mA)
4
5
6
40
3518 G09
3
2
0
10
20
30
1
8
7
T
A
= 25°C
VC = 0V