Integrated Driver. SC441A Datasheet

SC441A Driver. Datasheet pdf. Equivalent

Part SC441A
Description High Efficiency Integrated Driver
Feature SC441A www.DataSheet4U.com POWER MANAGEMENT Features                High Efficiency.
Manufacture Semtech Corporation
Datasheet
Download SC441A Datasheet




SC441A
SC441A
www.DataSheet4U.com
POWER MANAGEMENT
Features
High Efficiency Integrated Driver for
4-Strings of 150mA LEDs
Description
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% efficiency
Wide 0.2% to 100% PWM dimming range
Possible analog dimming
Integrated 2.5A power switch
700KHz switching frequency for small size
Adjustable OVP for cost-effective output cap selection
Open/short LED protection
Thermal protection with auto-recovery
Thermally enhanced TSSOP-20 EDP package
Fully WEEE and RoHS compliant
The SC441A is a high-efficiency multiple string WLED driv-
er 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 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.
The 700KHz switching frequency enables the user to op-
timize the external component sizes for efficiency. 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.
Applications
Medium-sized LCD panel
Notebook Display
Automotive Car Navigation Display
Sub-Notebook and Tablet Computer Displays
Portable Media Players
The SC441A 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, unaffected
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 SC441A is available in a thermally-enhanced TSSOP-
20 EDP package.
Typical Application Circuit
Vin (4.5V -21V)
SW
VIN
EN
SW
VOUT
OOVVPPIINN
FFLAG
PWM
COMP
SC441A
OVPRTN
IOIO11- -44
IIOOSSEETT
AAGGNNDD
SS
EDP
PPGGNNDD
IOGND
PGND
4
1
2
4 Strings
10
July 23, 2009
www.semtech.com 



SC441A
www.DataSheet4U.com
Pin Configuration
54
3
2
D IO2 1
IO1
IOGND
AGND
C SS
COMP
EN
IOSET
B PWM
VOUT
10
20 IO3
IO4
PGND
SW
SW
PGND
OVPIN
OVPRTN
VIN
11 FFLAG
θJA = 39º C/W
A (TSSOP-20 EDP)
54
Marking Information
3
2
SC441A
Ordering Information
1
Device
Package
SC441ATETRT (1,2)
D
SC441AEVB
TSSOP-20 EDP
Evaluation Board
Notes:
(1) Available in tape and reel only. A reel contains 2,500 devices.
(2) Available in lead-free package only. Device is WEEE and RoHS
comCpliant.
B
A
1
SC441A : Part Number
yyww = Date (Example: 0952)
xxxxxx = Semtech Lot# (Example: A94A01)
© 2009 Semtech Corporation
www.semtech.com 







@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)