SC440MLTRT Semtech, SC440MLTRT Datasheet - Page 17

• Manufacturer Part Number: SC440MLTRT
• Description: IC LED DRVR WHITE BCKLGT 24-MLPQ
• Manufacturer: Semtech
• Type: Backlight, White LEDr

Specifications of SC440MLTRT

• Constant Current: Yes
• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 6
• Internal Driver: Yes
• Type - Primary: Backlight
• Frequency: 640kHz ~ 960kHz
• Voltage - Supply: 4.5 V ~ 21 V
• Voltage - Output: 40V
• Mounting Type: Surface Mount
• Package / Case: 24-MLPQ
• Current - Output / Channel: 30mA
• Internal Switch(s): Yes
• Efficiency: 91%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Operating Temperature: -
• Other names: SC440MLTR

Case 1: Schematic for 8 LED Application
Case 2: Power Rail is powered up first with voltage from 2.7V to 4.2V and 5V
bias voltage comes late (5 Strings, 8 LEDs per channel)
© 2010 Semtech Corp.
VIN=5V ~ 20V
VIN=5V ~ 20V
2.7V~ 4.2V
Voltage
PWM
PWM
GND
GND
GND
GND
Rail
4.7n
4.7n
P1
R5 1
R5 1
P2
C9
C9
2.2u
2.2u
C7
C7
10k
10k
R6
R6
0
NOT RECOMMENDED FOR NEW DESIGNS: SEE SC440A
R8 2.49k
R8 2.49k
4.7n
C9
R9
R9
20k
20k
P5
2.2u
C7
C6
C6
2.2u
2.2u
10k
R6
Input Bias
0
L1
L1
13
13
14
14
15
15
16
16
17
17
18
18
5V
25
4.7u
4.7u
PWM
VIN
VIN
IOSET
IOSET
COMP
COMP
VOUT
VOUT
R8 4.32k
SCP_EN
SCP_EN
19
12
0
C6
2.2u
20k
20
R9
21
10
SC440
SC440
22
9
L1
13
14
15
16
17
18
23
8
8
8.2u, DR74 - 8R2
VIN
PWM
IOSET
SCP_EN
COMP
VOUT
24
D1
D1
OVPRTN
7
7
FFLAG
AGND 2
10uF
SS
EN
IO1
IO1
6
6
5
5
4
4
3
3
2
1
1
0
C2
C2
10k
10k
R7
R7
SC440
U1
R3
R3
20k
20k
47n
C8
226k
R2
R2
10k
R4
R4
SS14
D1
OVPRTN
FFLAG
AGND
EN
SS
IO1
1n
1n
CR4
CR4
10uF
6
5
4
3
2
1
C1
20k
R7
0
LED
LED
LED
LED
LED
LED
LED
LED
LED
LED
LED
LED
R3
20k
47nF
C8
8 LEDs per channel
8 LEDs per channel
10k
R2
200k
R4
1nF
CR4
8 LEDs per channel
www.semtech.com
LED
LED
LED
LED
LED
LED
LED
LED
LED
LED
LED
LED
SC440
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