• SC1102
  • 同步电压模式控制器,用于分布式电源应用
  • SC1103
  • 异步电压模式PWM控制器,12 V输入。
  • SC1104A
  • Not Recommended For New Designs
  • SC1104B
  • 简单,同步电压模式PWM控制器
  • SC1109
  • 同步PWM控制器的双低压差稳压器控制器
  • SC1110
  • 接收器和源的直流/直流电源控制器终止应用程序
  • SC1116
  • 为DDR供应 Linear FET的线性控制器
  • SC1175
  • 低功耗双同步DC-DC控制器和电流共享电路
Semtech SC4509

Semtech SC4509

Highly Integrated Boost Converter for White LED Applications in MLPD-W8-2x2


The SC4509 is a highly integrated step-up DC/DC converter targeted for white LED backlighting applications. It is designed to drive up to five LEDs with a wide input voltage range of 2.7 to 10 volts. Designed for an output voltage up to 20V, the SC4509 operates with a constant 1.2MHz PWM frequency.


  • VIN range: 2.7V — 10V
  • Integrated Schottky diode
  • 81% efficiency
  • 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


  • Digital Video Cameras
  • White LED Backlight Driver
  • OLED Display Driver
  • Portable Media Players
  • GPS Receivers
  • Cellular Phones
  • PDAs and Handheld Computers


SOT-23-6, MLPD-W8

Order Codes

  • SC4509SKTRT: Lead-Free, RoHS and WEEE Compliant, 3000 pcs.Tape & Reel
  • SC4509WLTRT: Lead-Free, RoHS and WEEE Compliant, 3000 pcs.Tape & Reel
  • SC4509EVB: SC4509 Evaluation Board

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