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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
Gate Driver
V BIAS
I CAP
CAP Bias Voltage (V IN – V CAP )
CAP Bias Current Limit
7V < V IN < 55V
(V IN – V CAP ) = V BIAS – 0.5V
6.5
6.8
22
7.1
V
mA
GATE High Level (V IN – V GATE )
GATE Low Level (V GATE – V CAP )
GATE Rise Time
GATE Fall Time
I GATE = –100mA
I GATE = 100mA
C GATE = 3.3nF to V IN
C GATE = 3.3nF to V IN
0.4
0.3
30
30
V
V
ns
ns
LED Driver
V ISET
Trimmed I SET Pin Voltage
LEDxx Operating Voltage
V IN = 48V, V ISP = V ISN = V LEDxx
l
l
1.181
1.205
1.229
36
V
V
LEDxx Leakage Current
LED Channel Off, V IN = 48V,
V ISP = V ISN = 36V, V LEDxx = 24V
0.2
μA
I LED
?I LEDC
?I LEDD
?I LINE
?I LOAD
LED Constant Sink Current
Current Mismatch Between Channels
Current Mismatch Between Devices
LED Current Line Regulation
LED Current Load Regulation
V ISP = V ISN = 5V, V LEDxx = 1V
REG DC = 0x00
REG DC = 0x20
REG DC = 0x3F
V ISP = V ISN = 5V, V LEDxx = 1V,
REG DC = 0x20 (Note 6)
V ISP = V ISN = 5V, V LEDxx = 1V,
REG DC = 0x20 (Note 7)
V ISP = V ISN = 5V, V LEDxx = 1V,
REG DC = 0x20, V CC = 3V to 5.5V (Note 8)
V ISP = V ISN = 5V, REG DC = 0x20,
V LEDxx = 1V to 3V (Note 9)
l
l
l
l
l
23.5
48
71
25.3
50.5
74
±1
±1
0.1
0.1
27
53
77
±3
±3
0.2
0.2
mA
mA
mA
%
%
%/V
%/V
V OPEN
Open LED Threshold
V ISP = V ISN = 5V, V LEDxx Falling
0.35
V
V SHT
T LEDON
Short LED Threshold
Minimum LED On-Time
PWMCK LOGIC
High Level Voltage
Low Level Voltage
V ISP = V ISN = 5V, V LEDxx Rising
V ISP = V ISN = 5V, REG GS = 0x001
V CC = 3V to 5.5V
3.7
2.4
0
3.9
0.5
4.1
V CC
0.6
V
μs
V
V
Thermal Protection
I TSET
T SET Output Current
V TSET = 1V
l
19.0
19.8
20.6
μA
T SET Over Temperature Threshold
T A = 25°C
510
mV
Serial Data Interface
V SIH
V SIL
I SI
V SOH
V SOL
Single-Ended Input (Note 10)
High Level Voltage
Low Level Voltage
Single-Ended Input Current
Single-Ended Output (Note 10)
High Level Voltage
Low Level Voltage
V CC = 3V to 5.5V
V CC = 3V to 5.5V, SI = V CC or GND
V CC = 3V to 5.5V
I SO = –1mA
I SO = 1mA
2.4
0
–0.2
V CC – 0.1
V CC
0.6
0.2
0.1
V
V
μA
V
V
V
3745f
4
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