SC446TETRT Semtech, SC446TETRT Datasheet - Page 6

• Manufacturer Part Number: SC446TETRT
• Description: IC LED DRVR WHT BCKLGT TSSOP-16
• Manufacturer: Semtech
• Type: Backlight, White LEDr

Specifications of SC446TETRT

• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 3
• Internal Driver: Yes
• Type - Primary: Backlight
• Frequency: 700kHz
• Voltage - Supply: 4.5 V ~ 27 V
• Voltage - Output: 36V
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP Exposed Pad, 16-eTSSOP, 16-HTSSOP
• Current - Output / Channel: 100mA
• Internal Switch(s): Yes
• Efficiency: 90%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Operating Temperature: -
• Other names: SC446TETR

Typical Characteristics (continued)
© 2010 Semtech Corporation
Condition: VIN = 12V, VOUT = 36V / 100mA x 3 strings
11
10
75
70
65
60
55
50
45
9
9
8
7
6
5
4
3
2
2
1
PWM Dimming Minimum Pulse Width
Condition: VIN = 12V, VOUT = 36V / 10mA x 3 strings
50
45
40
35
30
25
20
15
10
-40
5
0
PWM Dimming Frequency (kHz)
0.1
PWM Dimming Minimum Duty Cycle
0. 1
vs. PWM Dimming Frequency
I
OVPRTN
OVPRTN Saturation Voltage
0.2
vs. PWM Dimming Frequency
0. 2
PWM Dimming Frequency (kHz)
0.5
= 100uA
0. 5
vs. Temperature
Temperature (
1.0
1. 0
2.0
2. 0
5.0
25
5. 0
10.0
10. 0
o
20.0
C)
20. 0
30.0
30. 0
40.0
40. 0
50.0
50. 0
105
1.534
1.530
1.526
1.522
1.518
1.514
Condition: VIN = 12V, VOUT = 36V / 100mA x 3 strings
PWM Dimming Minimum Duty Cycle
12
10
8
6
4
2
0
-40
0. 1
vs. PWM Dimming Frequency
PWM Dimming Frequency (kHz)
0. 2
OVPIN Threshold Voltage
0. 5
vs. Temperature
Temperature (
1. 0
2. 0
25
5. 0
10. 0
VIN = 12V
20. 0
o
C)
30. 0
40. 0
50. 0
105
94
92
90
88
86
84
82
80
78
76
74
72
Condition: VIN = 12V, VOUT = 36V / 10mA x 3 strings
30
15
14
13
12
11
10
10
9
8
7
7
6
PWM Dimming Minimum Pulse Width
Condition: VOUT = 36V, L1=B1000AS-100M
0.1
60
Efficiency ( P
Boost Section Output Current (mA)
vs. PWM Dimming Frequency
PWM Dimming Frequency (kHz)
0.2
90
0.5
120
1.0
Efficiency
2.0
150
BOOST_OUTPUT
5.0
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180
10.0 20.0 30.0 40.0 50.0
210
/ P
SC446
240
5 VIN
4.5 VIN
INPUT
270
)
27 VIN
21 VIN
12 VIN
300
6