Datasheet

LT3745
9
3745f
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 vs V
ISN
CAP Bias Voltage (V
IN
- V
CAP
)
vs V
IN
CAP Bias Voltage (V
IN
- V
CAP
)
vs I
CAP
V
ISET
Pin Voltage vs Temperature
Oscillator Frequency f
OSC
vs Temperature
JUNCTION TEMPERATURE (°C)
–50
480
f
OSC
(kHz)
490
500
510
520
–25 0 25
3745 G19
50 75 100 125
LOAD CURRENT (mA)
0
0.60
V
LED
(V)
0.62
0.64
0.66
0.68
0.72
200
400 600 800
3745 G21
1000 1200
0.70
–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)
3745 G22
V
ISN
(V)
0
35
V
ISP
– V
ISN
(mV)
40
45
50
55
60
10
20 30
3745 G23
40
T = 125°C
T = –40°C
T = 25°C
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)
3745 G24
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)
3745 G25
T = 25°C
T = 125°C
T = –40°C
T
A
= 25°C, unless otherwise noted.
LOAD CURRENT (mA)
0
1.204
V
FB
(V)
1.206
1.208
1.210
1.212
1.216
200
400 600 800
3745 G20
1000 1200
1.214
–50
1.200
V
ISET
(V)
1.202
1.210
1.208
1.206
1.204
–25 0 25 50 75 100 125
JUNCTION TEMPERATURE (°C)
3745 G26