收藏本站
SC440A
High Effi ciency Integrated Driver
for 6-Strings of 30mA LEDs
POWER MANAGEMENT
Features
Wide input range 4.5V to 27V
42V maximum output voltage with adjustable OVP for
smaller output capacitor
Drives up to 72 WLEDs in 6 strings
Programmable WLED current for up to 30mA per
string
1% string-to-string current matching
2A integrated power switch
Up to 91% effi ciency
0.2% to 100% PWM dimming
Analog dimming
800KHz switching frequency for small external com-
ponent
Open/short LED protection
Short LED protection disable
<1uA shut-down current
Thermal protection
4mm x 4mm x1mm MLPQ-24 package (Pb-free, Halo-
Description
The SC440A 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 27V with a maximum
output voltage of 42V and a 2A internal power switch.
It can drive up to 42V output voltage in 6 strings with
current up to 30mA per string. The string-to-string current
matching is 1% typical, 3% maximum and 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
optimize the external component sizes for high effi ciency.
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 and voltage
ratings of the output capacitor.
gen free, WEEE & RoHS compliant)
The SC440A also features a comprehensive open and
Applications
Medium-sized LCD panel
Notebook Display
White LED Power Supplies
Sub-Notebook and Tablet Computer Displays
Portable Media Players
LCD Monitors
Digital Video Cameras
short circuit LED protection functions. It disables the
corresponding strings with LED open or LED short
conditions while keeping other strings under normal
operation. This feature allows LCD panels to remain
viewable even under LED failure, wire disconnect, or short-
circuit conditions. The short LED protection function can
be disabled. The internal thermal shutdown protects the
IC from overheating at abnormal conditions. The SC440A
is available in a common 4mm x 4mm x1mm MLPQ-24
package.
Typical Application Circuit
Vin (4.5V -27V)
1
2
SW
SW
VIN
SCP_EN
EN
FFLAG
VOUT
OVPIN
OVPRTN
6 Strings
PWM
SC440A
6
12
IO1-6
COMP
IOSET
AGND
SS
IOGND
Jan. 12, 2010
EDP
PGND
PGND
www.semtech.com 1
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
SC440MLTRT IC LED DRVR WHITE BCKLGT 24-MLPQ
SC441ATETRT IC LED DVR CONST CURRENT 20TSSOP
SC441CTETRT IC LED DVR CONST CURRENT 20TSSOP
SC441TETRT IC LED DRIVR WHT BCKLGT 20-TSSOP
SC442ULTRT IC LED DRVR CONST CURRENT 28MLPQ
SC443ULTRT IC LED DRIVR CONST CURRENT 16MLP
SC4509SKTRT IC LED DRVR WT/OLED BCKLT SOT236
SC4538ULTRT IC LED DRIVR WHITE BCKLGT MLPD-8
相关代理商/技术参数
SC440MLTRT 功能描述:IC LED DRVR WHITE BCKLGT 24-MLPQ RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C
SC441 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:High Effi ciency Integrated Driver for 4-Strings of 150mA LEDs
SC44-1 制造商:Thomas & Betts 功能描述:DEAD- END BRACKET 制造商:Belden Inc 功能描述:
SC441303MFU 制造商:Freescale Semiconductor 功能描述:
SC441400CFUER 制造商:Freescale Semiconductor 功能描述:68HC05B6 LEAD FREE
SC441401CFUER 制造商:Freescale Semiconductor 功能描述:68HC05B6 LEAD FREE
SC441A 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:High Efficiency Integrated Driver for 4-Strings of 150mA LEDs
SC441A_10 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:High Efficiency Integrated Driver for 4-Strings of 150mA LEDs