LTC3524_15 Datasheet, PDF (4/16 Pages) Linear Technology – Adjustable TFT Bias Supply with WLED Driver

LTC3524
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
LCD Boost Efficiency
vs Load Current
100
L = 10μH
V_OUT = 5V
90
80
70
V_IN = 5
60
V_IN = 4.2
V_IN = 3.6
V_IN = 3.1
V_IN = 2.5
50
0 10 20 30 40 50 60 70
V_OUT CURRENT (mA)
3524 G01
LED1 String Current vs V_IN
and Number of LEDs
22.0
21.5
21.0
20.5
20.0
19.5
PER STRING:
19.0
5 LEDs
4 LEDs
18.5
3 LEDs
2 LEDs
18.0
2.5
3
3.5
4
4.5
5
V_IN (V)
3524 G04
VH Voltage vs VH and
VN Load Current (FBH = 0V)
20
VN = 0mA
19
VN = 1mA
VN = 2mA
18
17
16
0
0.5
1
1.5
2
VH LOAD CURRENT (mA)
3524 G07
LED Efficiency vs V_IN
85
L = 4.7μH
80
75
PER STRING:
70
5 LEDs
4 LEDs
3 LEDs
2 LEDs
65
2.5
3
3.5
4
4.5
5
V_IN (V)
3524 G02
LED2 String Current
vs V_IN and Number of LEDs
22.0
21.5
21.0
20.5
20.0
19.5
PER STRING:
19.0
5 LEDs
4 LEDs
18.5
3 LEDs
2 LEDs
18.0
2.5
3
3.5
4
4.5
5
V_IN (V)
3524 G05
VN Voltage vs VN and
VH Load Current (FBN = 1.3V)
10.0
9.5
VH = 0mA
VH = 1mA
9.0
8.5
VH = 2mA
8.0
7.5
7.0
0
0.5
1
1.5
VN LOAD CURRENT (mA)
2
3524 G09
4
4 LEDs per String Efficiency
vs V_IN and LED Current
85
L = 4.7μH
80
75
70
65
60
55
5
V_IN = 5
V_IN = 4.2
V_IN = 3.6
V_IN = 3.1
V_IN = 2.5
10
15
20
LED CURRENT (mA)
25
3524 G03
V2X Output Voltage
vs V2X Load Current
10.0
9.5
9.0
8.5
0
1
2
3
4
V2X LOAD CURRENT (mA)
5
3524 G06
V_OUT, |VN|, and VH/2
Regulation Overtemperature
8.0
|VN|
7.5
7.0
6.5
VH/2
6.0
5.5
V_OUT
5.0
4.5
4.0
–40
–15 10
35
60
85
TEMPERATURE (°C)
3524 G10
3524f