SC441TETRT Semtech, SC441TETRT Datasheet - Page 6

• Manufacturer Part Number: SC441TETRT
• Description: IC LED DRIVR WHT BCKLGT 20-TSSOP
• Manufacturer: Semtech
• Type: Backlight, White LEDr

Specifications of SC441TETRT

• Constant Current: Yes
• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 4
• Internal Driver: Yes
• Type - Primary: Backlight
• Frequency: 560kHz ~ 840kHz
• Voltage - Supply: 4.5 V ~ 21 V
• Voltage - Output: 36V
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP
• Current - Output / Channel: 150mA
• Internal Switch(s): Yes
• Efficiency: 90%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Operating Temperature: -
• Other names: SC441TETR

Typical Characteristics (continued)
© 2010 Semtech Corporation
900
800
700
600
500
400
300
200
100
260
240
220
200
180
160
140
120
Condition: VIN = 12V, VOUT = 30V / 150mA x 4 strings
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
0
LED Current Source Saturation Voltage
0.5
10
-40
PWM Dimming Minimum Pulse Width
I
T
FFLAG
PWM Dimming Frequency (kHz)
A
20
FFLAG Saturation Voltage
1
= 25
vs. PWM Dimming Frequency
= 2mA
40
LED Current (mA)
Temperature (
vs. Temperature
2
vs. LED Current
o
C
60
5
80
25
NOT RECOMMENDED FOR NEW DESIGNS: SEE SC441A
10
o
100
C)
20
120
30
140
40
105
160
50
94
92
90
88
86
84
82
80
75
70
65
60
55
50
45
40
80
-40
22
20
18
16
14
12
10
Condition: VIN = 12V, VOUT = 30V / 20mA x 4 strings
I
8
6
4
2
0
OVPRTN
0.2
PWM Dimming Minimum Duty Cycle
160
OVPRTN Saturation Voltage
Efficiency ( P
Boost Section Output Current (mA)
vs. PWM Dimming Frequency
0.5
PWM Dimming Frequency (kHz)
= 100uA
240
VIN = 5V
Condition: VOUT = 36V
vs. Temperature
Temperature (
1
320
2
BOOST_OUTPUT
25
5
400
VIN = 21V
o
10
VIN = 12V
C)
480
20
/ P
INPUT
560
30
)
40
600
105
50
1.562
1.560
1.558
1.556
1.554
1.552
1.550
1.548
1.546
1.544
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
Condition: VIN = 12V, VOUT = 30V / 20mA x 4 strings
Condition: VIN = 12V, VOUT = 30V / 150mA x 4 strings
14
12
10
8
6
4
2
0
PWM Dimming Minimum Duty Cycle
0.2
0.5
PWM Dimming Minimum Pulse Width
-40
vs. PWM Dimming Frequency
0.5
PWM Dimming Frequency (kHz)
1
VIN = 12V
vs. PWM Dimming Frequency
OVPIN Threshold Voltage
PWM Dimming Frequency (kHz)
1
2
vs. Temperature
Temperature (
2
5
5
10
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25
10
20
20
o
C)
SC441
30
30
40
40
50
105
50
6