NOT RECOMMENDED FOR NEW DESIGNS: SEE SC440A
SC440
POWER MANAGEMENT
Features
High Efficiency Integrated Driver
for 6-Strings of 30mA LEDs
Description
?
?
?
?
Wide input range 4.5V to 21V
40V maximum output voltage with adjustable OVP for
smaller output capacitor
Drives up to 60 WLEDs in 6 strings
Programmable WLED current for up to 30mA per
The SC440 is a high-efficiency multiple string WLED driver
with an integrated boost converter. It operates over a wide
input range from 4.5V to 21V with a maximum output
voltage of 40V and a 2A internal power switch.
D
E S
D N
N G
E I
M S
M DE
O
C W
E E
R N
T R
Applications
O O
N F
string It can drive up to 40V output voltage in 6 strings with
? 1% string-to-string current matching current up to 30mA per string. The string-to-string current
? 2A integrated power switch matching is 1% typical, 3% maximum and the overall
? Up to 91% efficiency efficiency is greater than 90% due to the low current sense
? 0.2% to 100% PWM dimming voltage and a low-impedance internal power switch. The
? Analog dimming wide PWM dimming range boasts a ratio of 500: 1.
? 800KHz switching frequency for small external com-
ponent The 800kHz switching frequency enables the user to
? Open/short LED protection optimize the external component sizes for high efficiency.
? Short LED protection disable When there are fewer LEDs in each string, users can use
? <1uA shut-down current a lower output voltage protection level which yields an
? Thermal protection allowable reduction in associated costs, size and voltage
? 4mm x 4mm x1mm MLPQ-24 package (WEEE & RoHS ratings of the output capacitor.
compliant)
The SC440 also features a comprehensive open and
short circuit LED protection functions. It disables the
corresponding strings with LED open or LED short
? Medium-sized LCD panel conditions while keeping other strings under normal
? Notebook Display operation. This feature allows LCD panels to remain
? White LED Power Supplies viewable even under LED failure, wire disconnect, or short-
? Sub-Notebook and Tablet Computer Displays circuit conditions. The short LED protection function can
? Portable Media Players be disabled. The internal thermal shutdown protects the
? LCD Monitors IC from overheating at abnormal conditions. The SC440
? Digital Video Cameras is available in a common 4mm x 4mm x1mm MLPQ-24
package.
Typical Application Circuit
Vin (4.5V -21V)
1
2
VIN
SW
SW
VOUT
6 Strings
SCP_EN
EN
FFLAG
OVPIN
OVPRTN
PWM
SC440
IO1-6
6
10
COMP
IOSET
AGND
SS
IOGND
Sept. 24, 2010
EDP
PGND
PGND
www.semtech.com 1
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