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| 型号： | SC4509WLTRT |
| 厂商： | Semtech |
| 文件页数： | 1/15页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WT/OLED BCKLT MLPD-8 |
| 标准包装： | 1 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | OLED，白色 LED |
| 频率： | 1MHz ~ 1.4MHz |
| 电源电压： | 2.7 V ~ 10 V |
| 输出电压： | 20V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | MLPD-8 |
| 供应商设备封装： | 8-MLPD（2x2） |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | SC4509WLDKR |
SC4509
POWER MANAGEMENT
Description
Highly Integrated Step-Up Converter for
White LED Applications in MLPD-W8-2x2
Features
The SC4509 is a highly integrated step-up DC/DC convert-
er targeted for white LED backlighting applications. It is
designed to drive up to ? ve LEDs with a wide input voltage
range of 2.7 to 10 volts. Designed for 20V output voltage,
the SC4509 operates with a constant 1.2MHz PWM fre-
quency. To optimize ef ? ciency, the feedback voltage is set
to only 199mV, minimizing the power loss in the current
setting resistor. The product requires only four external
components (CIN, COUT, L and R SET ), making it ideal for
applications that require low cost and minimal PCB area.
The SC4509 offers current limit and over-voltage protec-
tion (OVP) to safeguard the device under extreme operat-
ing conditions. If the LEDs become disconnected or fail in
an open state condition, OVP circuitry will be activated to
shut down the device. The EN/SS pin allows the device
to be placed in power-down mode, disabling the control
circuitry to reduce input current.
V IN range: 2.7V — 10V
Integrated Schottky diode
81% ef ? ciency
Requires only 4 external components
Up to 20V of output voltage
30mA maximum LED current
Open LED protection (OVP)
1.2MHz PWM switching frequency
Low feedback voltage (20OmV typical)
Wide range of PWM dimming
Drives up to 5 LEDs
500mA switch current limit
220nF output capacitor
Available in 2mm x 2mm x 0.75mm MLPD-W8 and
SOT23-6 packages
Packages are fully WEEE and RoHS compliant
Applications
Digital Video Cameras
White LED Backlight Driver
OLED Display Driver
Portable Media Players
GPS Receivers
Cellular Phones
PDAs and Handheld Computers
Typical Application Circuit
Vin
L1
22 μ H
Vo
LED1
LED2
C2
0.22 μ F
LED3
U2
5
VIN
EN/SS
SC4509
LED4
C1
4
EN/SS
FB
3
R1
1 μ F
March 26, 2007
1
www.semtech.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SC450ITS | 制造商:Semtech Corporation 功能描述: |
| SC450ITS.TRT | 制造商:SEMTECH 功能描述:I.C. |
| SC450ITS.TRTCUT | 制造商:Semtech Corporation 功能描述: |
| SC450ITSTRT | 制造商:Semtech Corporation 功能描述:DC DC Cntrlr Single-OUT PWM DC to DC Controller 3V to 30V Input 38-Pin TSSOP T/R |
| SC450R1X542 | 制造商:American Power Conversion Corp (APC by Schneider Electric) 功能描述:APC Smart-UPS 制造商:Schneider Electric 功能描述:SMARTUPS SC 450 W/NETWORK MANAGEMENT CARD - Bulk |
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