SC441TETRT Semtech, SC441TETRT Datasheet - Page 9

• 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

Pin Descriptions
Note: Any unused IO pin should be pulled up to VIN.
Note: When EN = 0; the boost is turned OFF and disabled.
© 2010 Semtech Corporation
Pin #
15,18
16,17
EDP
10
11
12
13
14
19
20
1
2
3
4
5
6
7
8
9
EN
0
1
Pin Name
OVPRTN
IOGND
FFLAG
OVPIN
AGND
COMP
IOSET
PGND
VOUT
PWM
IO2
IO1
VIN
IO4
IO3
SW
EN
SS
NOT RECOMMENDED FOR NEW DESIGNS: SEE SC441A
Provides constant current source to LED string 2.
Provides constant current source to LED string 1.
Constant current source ground.
Analog ground
Soft-start pin
The output of the internal trans-conductance error amplifier.
Enable the device including regulator and LED drivers.
Current source IO value set pin. By selecting the resistor connected from this pin to GND,
the corresponding maximum current on all 4 strings are set.
PWM dimming control pin for LED strings.
Internal pull down current source in over voltage fault. Connect this pin directly to Boost output.
Power failure signal output with open collector. Held low under normal operation.
Power input voltage pin. Bypassed with capacitors close to the pin.
Over-Voltage Protection sense signal return path pin.
Over-Voltage Protection sense signal input.
Power ground
Collector of the internal power switch.
Provides constant current source to LED string 4. Connect to VIN for 3 strings operation.
Provides constant current source to LED string 3.
Solder to the ground plane of the PCB.
Pin Function
backlight disable
backlight enable
STATUS
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SC441
9