SC445
High Efficiency Integrated Driver for
4-Strings of 150mA LEDs
POWER MANAGEMENT
Features
Description
The SC445 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 and can sustain fast
Vin transient up to 5V/µs. It can drive up to forty WLEDs in
4 strings with current up to 150mA per string. The stringto-string current matching is 2% typical, 3% maximum.
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
500: 1.
Wide input voltage range from 4.5V to 27V
Sustain fast Vin fluctuation up to 5v/µs
42V 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% efficiency
Wide 0.2% to 100% PWM dimming range
Enable analog dimming
Integrated 3.0A power switch
700KHz switching frequency for small size
Adjustable OVP for cost-effective output cap selection
Open/short LED protection
Short LED protection enable/disable
Thermal protection with auto-recovery
Thermally enhanced TSSOP-20 EDP package
Lead-free, Halogen-Free and WeEE/RoHS Compliant
The 700KHz switching frequency enables the user to optimize the external component sizes for efficiency. When
there are fewer than 10 LEDs in each string, users can adjust the output voltage protection yielding an allowable
reduction in associated costs, size and voltage ratings of
the output capacitor.
The SC445 also features comprehensive open and shortcircuit LED protection functions. It disables the corresponding strings with LED open or LED short conditions
while maintaining normal operation of other, unaffected
LED strings. This feature allows LCD panels to remain viewable even under LED failure, wire disconnect, or short-circuit conditions. The internal thermal shutdown protects
the IC from overheating at abnormal conditions.
Applications
Medium-sized LCD panel
Notebook Display
Automotive Car Navigation Display
Sub-Notebook and Tablet Computer Displays
Portable Media Players
The SC445 is available in a thermally-enhanced TSSOP-20
EDP package.
Typical Application Circuit
Vin (4.5V -27V)
1
2
VIN
SW
SW
VOUT
SCP_EN
4 Strings
OVPIN
OVPIN
EN
FFLAG
PWM
SC445
COMP
IO1-4
IO14
4
12
IOSET
IOSET
AGND
AGND
IOGND
SS
EDP
Revision 2.1
PGND
PGND
PGND
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