Datasheet

LT3519/LT3519-1/LT3519-2
4
3519fa
TYPICAL PERFORMANCE CHARACTERISTICS
V
ISP
-V
ISN
Threshold vs V
CTRL
Switch Current Limit
vs Duty Cycle
V
REF
Voltage vs Temperature
V
ISP-
V
ISN
Threshold
vs Temperature
Switch Current Limit
vs Temperature
Oscillator Frequency
vs Temperature (LT3519)
V
ISP-
V
ISN
Threshold vs V
ISP
V
REF
Voltage vs V
IN
Quiescent Current vs V
IN
V
CTRL
(V)
0
200
250
300
3519 G01
150
100
0.5 1.0 1.5 2.0
50
0
–50
V
ISP
-V
ISN
THRESHOLD (mV)
V
IN
= 12V
V
ISP
= 24V
TEMPERATURE (°C)
–50
V
REF
(V)
2.00
2.02
125
3519 G03
1.98
1.96
0
50
100
–25
25
75
2.04
1.99
2.01
1.97
2.03
V
IN
= 12V
TEMPERATURE (°C)
–50
240
V
ISP
-V
ISN
THREHSOLD (mV)
242
246
248
250
260
254
0
50
75
3519 G04
244
256
258
252
–25 25
100
125
V
IN
= 12V
V
ISP
= 24V
V
CTRL
= 2V
TEMPERATURE (°C)
–50
600
SWITCH CURRENT LIMIT (mA)
700
800
900
1000
050
100
125
3519 G05
1100
1200
–25 25
75
V
IN
= 12V
V
ISP
(V)
0
V
ISP
-V
ISN
THRESHOLD (mV)
252
256
260
40
3519 G07
248
244
250
254
258
246
242
240
10
20
30
50
V
IN
= 12V
V
CTRL
= 2V
V
IN
(V)
0
V
REF
(V)
2.00
2.02
40
3519 G08
1.98
1.96
10
20
30
5
15
25
35
2.04
1.99
2.01
1.97
2.03
V
IN
(V)
0
0
V
IN
CURRENT (mA)
0.5
1.0
1.5
2.0
2.5
3.0
10 20 30 40
3519 G09
V
PWM
= 5V
V
FB
= 1.5V
DUTY CYCLE (%)
0
600
SWITCH CURRENT LIMIT (mA)
700
800
900
1000
1100
1200
25 50 75 100
3519 G02
TEMPERATURE (°C)
–50
FREQUENCY (kHz)
400
410
420
25 75
3519 G06
390
380
–25 0
50 100 125
370
360
(T
A
= 25°C unless otherwise noted)