SC446TETRT Semtech, SC446TETRT Datasheet - Page 10

• 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

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5
Block Diagram
© 2010 Semtech Corporation
OVPRTN
OVPIN
IOSET
VOUT
IO1
SS
0.9mA
0.9mA
LED CURRENT
SETTING
OVP
Detect
ONE IO CHANNEL SHOWN
LED OPEN / SHORT
CIRCUIT PROTECTION
HICCUP
4
OVP
4
Fault
CURRENT
SOURCE
4.5uA
4.5uA
1uA
1uA
3V3
Figure 1. SC446 Block Diagram
DISABLE1
FAULT-1
HICCUP
CONTROL
LOGIC
HICCUP
3
3
4
5
HICCUP
Fault
6
-
UVLO
TSD
OSC
ILIM
ISENSE
UVLO & TSD
SS
S
R
Bandgap
Q
-
-
2
2
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SC446
SW
PGND
PGND
COMP
VIN
AGND
PWM
EN
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