LT3590ESC8#TRPBF Linear Technology, LT3590ESC8#TRPBF Datasheet - Page 4

• Manufacturer Part Number: LT3590ESC8#TRPBF
• Description: IC LED DRVR WHITE BCKLGT SC-70-8
• Manufacturer: Linear Technology
• Type: Backlight, White LEDr

Specifications of LT3590ESC8#TRPBF

• Topology: PWM, Step-Down (Buck)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: White LED
• Frequency: 650kHz ~ 1.05MHz
• Voltage - Supply: 4.5 V ~ 55 V
• Voltage - Output: 55V
• Mounting Type: Surface Mount
• Package / Case: SC-70-8
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 50mA
• Internal Switch(s): Yes
• Efficiency: 91%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LT3590
TYPICAL PERFORMANCE CHARACTERISTICS
4
0.8
0.7
0.6
0.5
0.4
0.3
0.2
20
18
16
14
12
10
–50
20
Switch Saturation Voltage
(V
Shutdown Quiescent Current
vs Temperature
V
V
25°C
CTRL
IN
CESAT
–25
= 48V
= 0V
)
40
SWITCH CURRENT (mA)
20mA/DIV
0
TEMPERATURE (°C)
20V/DIV
V
SW
–40°C
25
125°C
I
L
Switching Waveform
V
I
10 WHITE LEDs
L = 470μH (COILCRAFT)
60
LED
IN
50
= 48V
= 50mA
75
80
100
3590 G01
3590 G04
1μs/DIV
125
100
600
550
500
450
400
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0
0
Schottky Forward Voltage Drop
Quiescent Current
3590 G07
V
T
A
CTRL
SCHOTTKY FORWARD CURRENT (mA)
= 25°C
10
= 3.3V
50
20
–40°C
125°C
V
IN
100
50mA/DIV
50mA/DIV
30
(V)
50V/DIV
5V/DIV
CTRL
V
I
LED
SW
40
I
L
Transient Response
V
I
10 BLUE LEDs
150
LED
IN
= 48V
= 50mA
50
25°C
3590 G02
3590 G05
200
60
40μs/DIV
1.0
2.0
1.5
0.5
20
12
10
18
16
14
0
–50
0
Shutdown Quiescent
Current vs V
Schottky Leakage Current
V
T
CTRL
A
–25
= 25°C
10
= 0V
3590 G08
0
TEMPERATURE (°C)
20
IN
25
V
V
IN
IN
30
= 4.5V
(V)
50
V
IN
40
= 24V
75
V
IN
= 48V
50
100
3590 G06
3590 G03
3590f
125
60