Datasheet

LT3746
9
3746fa
For more information www.linear.com/3746
Typical perForMance characTerisTics
FB Regulation Voltage vs
Load Current
LED Regulation Voltage vs
Load Current
Soft-Start Charge Current I
SS
vs
Temperature
Current Sense Threshold
(V
ISP
- V
ISN
) vs V
ISN
CAP Bias Voltage (V
IN
- V
CAP
)
vs V
IN
CAP Bias Voltage (V
IN
- V
CAP
)
vs I
CAP
(V
IN
- V
CAP
) UVLO Threshold vs
Temperature
Oscillator Frequency f
OSC
vs R
T
Oscillator Frequency f
OSC
vs
Temperature
–50
4.40
V
IN
- V
CAP
(V)
4.60
4.50
4.70
4.80
4.90
–25 25 50 75 100 1250
JUNCTION TEMPERATURE (°C)
3746 G19
UVLO
–
UVLO
+
–50
480
f
OSC
(kHz)
500
490
510
520
–25 25 50 75 100 1250
JUNCTION TEMPERATURE (°C)
3746 G21
0
1.198
V
FB
(V)
1.202
1.200
1.204
1.206
1.208
200 400 600 800 1000
LOAD CURRENT (mA)
3746 G22
0
0.48
V
LEDxx
(V)
0.49
0.50
0.51
0.52
200 400 600 800 1000
LOAD CURRENT (mA)
3746 G23
–50
–11.0
I
SS
(µA)
–10.8
–10.6
–10.4
–10.0
–10.2
–25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
3746 G24
0
45
V
ISP
-V
ISN
(mV)
46
47
49
48
3 6 9 12 15
V
ISN
(V)
3746 G25
T = 25°C
T = 125°C
T = –40°C
T
A
= 25°C, unless otherwise noted.
20 60 100 180 220 260
0
f
OSC
(kHz)
400
200
600
800
1000
140 300
R
T
(kΩ)
3746 G20
0
6.70
V
IN
-V
CAP
(V)
6.74
6.78
6.90
6.86
6.82
10 20 30 40 50 60
V
IN
(V)
3746 G26
T = 25°C
T = 125°C
T = –40°C
0
6.20
V
IN
-V
CAP
(V)
6.30
6.40
6.90
6.80
6.70
6.60
6.50
4 8 12 16 2420
I
CAP
(mA)
3746 G27
T = 25°C
T = 125°C
T = –40°C