SC441 Semtech Corporation, SC441 Datasheet
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SC441
Manufacturer Part Number
SC441
Description
High Effi ciency Integrated Driver
Manufacturer
Semtech Corporation
Datasheet
1.SC441.pdf
(1 pages)
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POWER MANAGEMENT
Features
Applications
Typical Application Circuit
April 26, 2007
Wide input voltage range from 4.5V to 21V
36V maximum output voltage
Drives up to 40 WLEDs in 4 strings
Programmable LED current for up to 150mA per
string
+/- 2% string-to-string current matching
Up to 90% effi ciency
Wide 0.2% to 100% PWM dimming range
Possible analog dimming
Integrated 2.5A power switch
800kHz switching frequency for small size
Adjustable OVP for cost-eff ective output cap selection
Open/short LED protection
Thermal protection with auto-recovery
Thermally enhanced TSSOP-20 EDP package
Fully WEEE and RoHS compliant
Medium-sized LCD panel
Notebook Display
Automotive Car Navigation Display
Sub-Notebook and Tablet Computer Displays
Portable Media Players
Vin (4.5V -21V)
VIN
COMP
SS
SS
EN
FFLAG
PWM
COMP
EDP
SW
PGND
PGND
SC441
High Effi ciency Integrated Driver for
PGND
SW
OVPRTN
OVPIN
IOGND
OVPIN
IO1- 4
IOSET
IOSET
AGND
VOUT
AGND
VOUT
IO1-4
Description
The SC441 is a high-effi ciency multiple string WLED driver
with an integrated boost converter. It operates over a
wide input range from 4.5V to 21V with a maximum out-
put voltage of 36V and a 2.5A internal power switch. It
can drive up to forty WLEDs in 4 strings with current up
to 150mA per string. The string-to-string current match-
ing is 2% typical, 3% maximum. The overall effi ciency is
greater than 90% due to the low current sense voltage
and a low-impedance internal power switch. The wide
PWM dimming range boasts a ratio of 500: 1.
The 800kHz switching frequency enables the user to op-
timize the external component sizes for effi ciency. When
there are fewer than 10 LEDs in each string, users can ad-
just the output voltage protection yielding an allowable
reduction in associated costs, size and voltage ratings of
the output capacitor.
The SC441 also features comprehensive open and short-
circuit LED protection functions. It disables the corre-
sponding strings with LED open or LED short conditions
while maintaining normal operation of other, unaff ected
LED strings. This feature allows LCD panels to remain view-
able even under LED failure, wire disconnect, or short-cir-
cuit conditions. The internal thermal shutdown protects
the IC from overheating at abnormal conditions.
The SC441 is available in a thermally-enhanced TSSOP-20
EDP package.
4
4-Strings of 150mA LEDs
10
2
1
4 Strings
SC441
1