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LT3598
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 = V IN unless otherwise noted. (Note 2)
PARAMETER
Minimum Operating Voltage
CONDITIONS
MIN
TYP
3
MAX
3.2
UNITS
V
Maximum Operating Voltage
30
V
Reference Voltage
Reference Voltage Line Regulation
Maximum V REF Pin Current
FB Pin Bias Current
FB Error Amp Transconductance
3.2V < V IN < 30V, V C = 0.3V
Out of Pin
V FB = 1.230V (Note 3)
ΔI = 5μA
l
1.216
1.210
200
1.230
0.01
100
300
1.260
1.260
0.03
250
V
V
%/V
μA
nA
μmhos
FB Error Amp Voltage Gain
600
V/V
FB Pin Voltage
Current Loop Amp Transconductance
Current Loop Amp Voltage Gain
V C Sink Current
Quiescent Current
Quiescent Current in Shutdown
V SHDN = 5V, PWM = 0V, Not Switching
V SHDN = 0V
1.22
1.24
21
80
10
3.5
0
1.26
5
1
V
μmhos
V/V
μA
mA
μA
I SET Voltage
LED Current
LED String Current Matching
LED Open Detection Threshold
V CTRL = 1.5V, V TSET = 1.5V, R ISET = 14.7kΩ
R ISET = 14.7kΩ
20mA LED Current
l
0.985
19.5
1.000
20
±0.5
0.2
1.015
20.7
±1.5
0.25
V
mA
%
V
OPENLED Sink Current
Minimum LED Regulation Voltage
2
0.8
mA
V
LED1-6 Leakage Current
CTRL Pin Bias Current
V LED1-6 = 1V, V OUT = 5V, PWM = 0V
V LED1-6 = 42V, V OUT = 44V, PWM = 0V
V CTRL = 0.8V (Note 4)
0.1
0.2
50
1
2
125
μA
μA
nA
Switching Frequency
RT = 309kΩ
RT = 51.1kΩ
RT = 14.7kΩ
171
0.9
2.25
190
1
2.5
209
1.1
2.75
kHz
MHz
MHz
T SET Voltage
602
mV
Maximum Switch Duty Cycle
RT = 309kΩ
RT = 51.1kΩ
RT = 14.7kΩ
l
90
87
80
95
90
86
%
%
%
Switch Current Limit
Switch V CESAT
Switch Leakage Current
(Note 5)
I SW = 0.5A
V SW = 40V
1.5
2
0.12
0.2
2.5
5
A
V
μA
3598fb
3
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