Datasheet

LT3599
5
3599fe
TYPICAL PERFORMANCE CHARACTERISTICS
SHDN/UVLO Pin Turn-On
Threshold (V
SD_UVLO
)
SHDN/UVLO Pin
(Hysteresis) Current V
IN
Current (Shutdown)
V
REF
Switching Frequency Switching Frequency vs R
T
LED Current vs CTRL Pin Soft-Start Pin Current
JUNCTION TEMPERATURE (°C)
–50
SHDN/ UVLO (V)
1.40
1.35
050
–25
25 75 100 150125
1.25
1.30
1.45
3599 G01
0
V
IN
CURRENT (nA)
50
150
200
250
500
350
100
400
450
300
3599 G03
V
IN
= 30V
V
IN
= 3V
JUNCTION TEMPERATURE (°C)
–50
050
–25
25 75 100 150125
JUNCTION TEMPERATURE (°C)
–50
V
REF
(mV)
1240
1230
050
–25
25 75 100 150125
1210
1220
1250
3599 G04
V
IN
= 30V
V
IN
= 3V
CTRL PIN VOLTAGE (V)
0
LED CURRENT (mA)
60
80
120
1.0
40
20
0
0.2 0.4
0.6
0.8
1.2
100
3599 G07
I
SET
= 13.3k
JUNCTION TEMPERATURE (°C)
–50
I
SS
(μA) (OUT OF PIN)
050
–25
25 75 100 150125
3599 G08
10
11
13
9
8
7
12
R
T
(k)
SWITCHING FREQUENCY (kHz)
3599 G06
10000
1000
100
10 100 1000
JUNCTION TEMPERATURE (°C)
–50
SHDN /UVLO PIN CURRENT (μA)
050
–25
25 75 100 150125
3599 G02
4
5
3
2
1
0
6
JUST BEFORE PART TURN-ON
AFTER PART TURN-OFF
JUNCTION TEMPERATURE (°C)
–50
SWITCHING FREQUENCY (MHz)
2.0
2.5
3.0
25 75
3599 G05
1.5
1.0
–25 0
50 100 150125
0.5
0
2.1MHz
0.2MHz
1MHz
T
A
= 25°C unless otherwise specifi ed
T
SET
Pin Threshold
vs Junction Temperature
JUNCTION TEMPERATURE (°C)
0
500
V
TSET
THRESHOLD (mV)
600
700
800
50
100 125
25
75
150
900
550
650
750
850
3599 G09