SC446TETRT Semtech, SC446TETRT Datasheet - Page 9

• 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

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 #
EDP
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
EN
0
1
Pin Name
OVPRTN
OVPIN
AGND
COMP
IOSET
PGND
PGND
VOUT
PWM
IO1
VIN
IO3
IO2
SW
EN
SS
Provides constant current source to LED string 1.
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 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.
Power ground.
Provides constant current source to LED string 3. Connect to VIN for 2 strings operation.
Provides constant current source to LED string 2.
Solder to the ground plane of the PCB.
Pin Function
backlight disable
backlight enable
STATUS
www.semtech.com
SC446
9