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SC443
POWER MANAGEMENT
Features
High Efficiency Integrated Boost Driver
for 3-Strings of 30mA LEDs
Description
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Wide input voltage range from 4.5V to 27V
42V maximum operating output voltage
Programmable LED current for up to 30mA per
string
+/- 1% typical string-to-string current matching
Greater than 90% efficiency
Wide 0.4% to 100% PWM dimming range
Integrated 1A power switch
Programmable switching frequency for small size
Low current sense voltage for high efficiency
Adjustable OVP for cost- ef fec tive output cap
selection
LED open circuit protection
Thermal protection with auto-recovery
3mm × 3mm ×0.6mm MLP-UT-16 lead-free package
(WEEE and RoHS compliant)
The SC443 is a high-efficiency multiple string WLED driver
with an integrated boost converter. It operates over a wide
input range from 4.5V to 27V with a maximum output
voltage of 42V and a 1A internal power switch.
It can drive 3 strings with current up to 30mA per string.
The string-to-string current matching is within, typically,
1% and the overall efficiency 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 250: 1.
The programmable switching frequency enables the
user to optimize the external component sizes for high
efficiency. When there are fewer LEDs in each string, users
can use a lower output voltage protection level which
yields an allowable reduction in associated costs, size
Applications
and voltage ratings of the output capacitor.
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Small to Medium Size LCD Panel
Notebook Display
White LED Power Supplies
Sub-Notebook and Tablet Computer Displays
Portable Media Players
LCD Monitors
Digital Video Cameras
The SC443 also features an open circuit LED protection
function. It disables the corresponding strings with LED
open while keeping other strings under normal operation.
This feature allows LCD panels to remain viewable even
under LED failure and wire disconnectons. The internal
thermal shutdown protects the IC from overheating at
abnormal conditions. The SC443 is available in a 3mm
× 3mm × 0.6mm MLP-UT 16 Lead-free package.
Typical Application Circuit
V IN
VIN
SW
VOUT
OVPIN
COMP
SS
FSET
SC443
AGND
IO1 - 3
IOSET
3
Enable
Dimming
EN
PWM
PGND
IOGND
January 21, 2009
www.semtech.com
1
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