PWM Controllers
  • SC1102
  • Synchronous Voltage-Mode Controller for Distributed Power-Supply Applications
  • SC1103
  • Asynchronous Voltage-Mode PWM Controller for 12 V Input
  • SC1104A
  • Not Recommended For New Designs
  • SC1104B
  • Simple, Synchronous Voltage-Mode PWM Controller
  • SC1109
  • Synchronous PWM Controller With Dual Low-Dropout Regulator Controllers
  • SC1110
  • Sink and Source DC/DC Controller For Termination Power Supply Applications
  • SC1116
  • Linear FET Controller for DDR Supplies
  • SC1175
  • Low-Power Dual Synchronous DC/DC Controller with Current-Sharing Circuitry
Semtech SC4509

Semtech SC4509

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

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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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