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LT3754
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25°C. V IN = V OUT = 6V, R ISET = 14.7k unless otherwise noted.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
INPUT BIAS, REFERENCE
Minimum Operational V IN (To Allow GATE Switching)
Operational V IN
V IN Quiescent Current
V IN Shutdown Current (V IN ≠ INTV CC ) (Not Shorted)
V IN Shutdown Current (V IN = INTV CC (Shorted))
V C = 1.5V
V IN = INTV CC (Shorted)
V IN ≠ INTV CC
V IN = INTV CC (Shorted)
V IN ≠ INTV CC
LEDx = 1.2V
CTRL = 0.1V, PWM = 0V
CTRL = 0.1V, PWM = 1.5V, (Not Switching)
SHDN /UVLO = 0V, V IN =6V
SHDN /UVLO = 0V, V IN = 40V
SHDN /UVLO = 0V, V IN = INTV CC = 4.5V
SHDN /UVLO = 0V, V IN = INTV CC = 13V
l
l
4.5
6
4.2
5.5
4.2
9.5
0.1
10
20
4.5
6.0
13
40
5.7
12
2
10
20
40
V
V
V
V
mA
mA
μA
μA
μA
μA
SHDN /UVLO Threshold (Micropower) (Falling) (V SD )
I VIN < 20μA
l
0.3
0.7
V
SHDN /UVLO Threshold (UVLO) (Falling)
(Stop Switching) (V UV )
l
1.414
1.476
1.538
V
SHDN /UVLO Pin Current
V REF Voltage
V REF Line Regulation
SHDN /UVLO = V UV - 50mV
SHDN /UVLO = V UV + 50mV
I VREF = 0μA
I VREF = 0μA, 6V < V IN < 40V
l
l
1.6
1.450
2.4
0
1.485
0.01
3.2
1.524
0.05
μA
μA
V
%/V
V REF Load Regulation
0 < I VREF < 150μA (Max)
2
mV
OSCILLATOR
Frequency: f OSC (100kHz)
Frequency: f OSC (1MHz)
f OSC (1MHz) Line Regulation
RT = 523k
RT = 39.2k
RT = 39.2k, 6V < V IN < 40V
l
l
92
0.90
101
1
0.1
112
1.10
0.2
kHz
MHz
%/V
RT Pin Voltage
RT = 39.2k
1.6
V
Minimum Off-Time
Minimum On-Time
(Note 5)
(Note 5)
170
190
250
250
nS
nS
SYNC Input High Threshold
SYNC Input Low Threshold
0.6
2.2
V
V
SYNC Input Current
SYNC = 0V
SYNC = 5V
0
25
μA
μA
SYNC Frequency Range
RT = 523k
RT = 39.2k
0.12
1.2
1.5
1.5
MHz
MHz
LINEAR REGULATOR (INTV CC )
INTV CC Regulation Voltage
Dropout (V IN - INTV CC )
INTV CC UVLO (+)
INTV CC UVLO (–)
INTV CC Current Limit
V IN = 12V
I INTVCC = 10mA
(Start Switching)
(Stop Switching)
l
6.65
44
7
250
3.8
3.4
57
7.35
V
mV
V
V
mA
OVP/LED ERROR AMPLIFIERS
Transconductance (OVP)
Voltage Gain (OVP)
Transconductance (LED)
?I VC = ±2.5μA
?I VC = ±2.5μA
4
5
33
μmhos
V/V
μmhos
3754fc
3
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