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LT3745
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 = 12V, V CC = 3.3V, V EN/UVLO = 1.5V, V FB = 1.5V,
V ISP = V ISN = 0V, R T = 105k, R ISET = 60.4k, C CAP = 0.47μF to V IN , unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Supply
V IN
I VIN
V CC
I VCC
V IN Operating Voltage
V IN Supply Current
V CC Operating Voltage
V CC Supply Current (Note 4)
V EN/UVLO = 0V
No Switching
V EN/UVLO = 0V
LED Channel Off, 30MHz Data Off
LED Channel On, 30MHz Data Off
LED Channel On, 30MHz Data On
l
l
6
3
0.2
0.4
0.1
3.1
7
16
55
2
0.55
5.5
1
3.6
V
μA
mA
V
μA
mA
mA
mA
Undervoltage Lockout (UVLO)
V CC UVLO Threshold
EN/UVLO Shutdown Threshold
UVLO Threshold
V CC Rising
V CC Falling
I VCC <20μA
V EN/UVLO Rising
V EN/UVLO Falling
2.82
2.61
0.35
1.28
1.19
2.89
2.68
1.31
1.22
2.96
2.75
1.34
1.25
V
V
V
V
V
I EN/UVLO
EN/UVLO Bias Current
V EN/UVLO = V CC = 3.3V
0.1
1
μA
(V IN – V CAP ) UVLO Threshold
(V IN – V CAP ) Rising
(V IN – V CAP ) Falling
4.6
4.2
4.9
4.5
5.2
4.8
V
V
Soft-Start (SS)
I SS
Soft-Start Charge Current
V SS = 1V
–16
–12
–8
μA
Soft-Start Discharge Current
V SS = V CC , V EN/UVLO = 1V
330
μA
V SS(TH)
Soft-Start Reset Threshold
0.35
V
Oscillator
V RT
I RT
RT Pin Voltage
RT Pin Current Limit
V RT = 0V
1.186
1.205
–80
1.224
V
μA
f OSC
f SYNC
Oscillator Frequency
Sync Frequency Range (Note 5)
SYNC LOGIC
High Level Voltage
Low Level Voltage
R T = 280k
R T = 105k
R T = 46.4k
R T = 348k
V CC = 3V to 5.5V
188
475
965
200
2.4
0
200
500
1015
212
525
1065
1000
V CC
0.6
kHz
kHz
kHz
kHz
V
V
Error Amplifier s and Loop Dynamics
V FB
FB Regulation Voltage
V ISN = 5V
l
1.186
1.210
1.234
V
I FB
FB Input Bias Current
V ISN = 5V, V FB Regulated
–120
nA
T OFF(MIN)
T ON(MIN)
LED Regulation Voltage
Minimum GATE Off-Time
Minimum GATE On-Time
V ISN = 5V, V FB = 1V
V ISP = V ISN = 5V, V FB = 1V
(V ISP – V ISN ) = 60mV, V ISN = 5V, V FB = 1V
0.63
0.715
120
200
0.8
V
ns
ns
Current Sense Amplifier
ISP/ISN Pin Common Mode
V IN to ISN Dropout Voltage (V IN – V ISN )
V ISP = V ISN
V ISP = V ISN , V FB = 1V
l
l
0
1.7
36
2.1
V
V
I ISP
I ISN
Current Limit Sense Threshold (V ISP – V ISN )
ISP Input Bias Current
ISN Input Bias Current
V FB = 1V
34
46.5
–24
–48
59
mV
μA
μA
3745f
3
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