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LT3599
ELECTRICAL CHARACTERISTICS The l denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C. V IN = 5V, V SHDN = 5V, unless otherwise noted. (Note 2)
PARAMETER
Minimum Operating Voltage
Maximum Operating Voltage
CONDITIONS
l
l
MIN
TYP
2.7
MAX
3.1
30
UNITS
V
V
Reference Voltage V REF
Reference Voltage Line Regulation
I(V REF ) = 0μA
I(V REF ) = 0μA, 3.1V < V IN < 30V
l
1.21
1.20
1.227
0.01
1.24
1.25
0.03
V
V
%/V
Maximum V REF Pin Current
V REF Load Regulation
(Note 3)
0 < I(V REF ) ≤ 100μA (Max)
1
100
μA
mV
Feedback Voltage
FB Pin Bias Current
FB Error Amp Transconductance
(Note 3)
Δ I = 5μA
l
1.196
1.223
100
200
1.250
250
V
nA
μmhos
FB Error Amp Voltage Gain
Current Loop Amp Transconductance
Current Loop Amp Voltage Gain
210
50
50
V/V
μmhos
V/V
V C Source Current (Out of Pin)
V C Sink Current (OVP Mode)
LED1-4 = 0.4V, FB = 1V, V C = 1.5V
LED1-4 = 0.4V, FB = 1.5V, V C = 1.5V
8
15
μA
μA
Quiescent Current
Quiescent Current in Shutdown
V SHDN = 5V, PWM = 0V, Not Switching, V C = 0.7V
V SHDN = 0V
3
0
4.8
1
mA
μA
LED Current
LED String Current Matching
R ISET = 13.3k
100mA LED Current
l
96
99
±0.25
102
±1.5
mA
%
LED Open Detection Threshold (V LED –GND)
LED Short Detection Threshold (V OUT –V LED )
LED Regulation Voltage
LED1-4 Leakage Current
CTRL Pin Bias Current
FB > 1.25V
V LED1-4 = 45V
V CTRL = 0.8V (Note 3)
0.8
0.3
1.5
0.77
0.1
100
0.4
2.2
1
200
V
V
V
μA
nA
Switching Frequency
R T = 324k
R T = 53.6k
R T = 20k
176
0.9
1.82
198
1
2.06
220
1.1
2.3
kHz
MHz
MHz
T SET Voltage
595
mV
Maximum Switch Duty Cycle
R T = 324k
R T = 53.6k
R T = 20k
l
l
l
97.7
88.5
77
98.6
93
86
%
%
%
Switch Current Limit
Switch V CESAT
Switch Leakage Current
SHDN /UVLO Pin Threshold (V SD_ SHDN )
SHDN /UVLO Pin Threshold (V SD_ UVLO )
SHDN /UVLO Pin Hysteresis Current
Soft-Start Current
(Note 4)
I SW = 0.5A
V SW = 45V, FB = 1.3V
Shutdown
Rising
SHDN = V SD_UVLO – 50mV
SHDN = V SD_UVLO + 50mV
SS = 1V (Note 3)
2
0.3
1.28
2.5
2.5
0.10
0.2
0.7
1.36
4
0
11
3
5
0.95
1.44
5.5
A
V
μA
V
V
μA
μA
μA
PWM Input High Threshold
PWM Input Low Threshold
0.4
1
V
V
3599fe
3
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