LED Drivers
  • SC445
  • High Efficiency Integrated Driver for 4-Strings of 150mA LEDs
  • SC440
  • High Effi ciency Integrated Driver for 6-Strings of 30mA LEDs
  • SC440A
  • High Efficiency Integrated Driver for 6-Strings of 30mA LEDs
  • SC441A
  • High Efficiency Integrated Driver for 4-Strings of 150mA LEDs - AEC-Q100 Qualified
  • SC441C
  • High Efficiency Integrated Driver for 4-Strings of 150mA LEDs - High Voltage Input
  • SC442
  • 10-Channel, Integrated, High Efficiency 120 White LED Driver
  • SC443
  • High Efficiency Integrated Boost Driver for 3-Strings of 30mA LEDs
  • SC446
  • High Efficiency Integrated Driver for 3-Strings of 100mA LEDs
Semtech SC4540

Semtech SC4540

High Efficiency Boost Converter for up to 10 LEDs

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The SC4540 is designed to regulate current for a series string of white LEDs in LCD backlighting applications where small size and high effi ciency are priorities. This device integrates an 800kHz current-mode PWM boost converter and a 30mA programmable low dropout current sink regulator.

Features


  • Input voltage range — 4.5V to 12V
  • Programmable LED current up to 30mA
  • Current-mode PWM control — 800kHz
  • Soft-start to reduce in-rush current
  • PWM dimming — 100Hz to 50kHz
  • PWM dimming at ISET — analog and fi ltered
  • Over-voltage protection — 38V (minimum)
  • Under-voltage lockout (UVLO)
  • Thermal shutdown
  • Shutdown current — <0.1μA (typical)
  • Ultra-thin package — 2 x 2 x 0.6 (mm)
  • Lead-free package, WEEE and RoHS compliant

Applications


  • DSLR, DSC, and Video Cameras
  • Portable media players
  • Set-top boxes
  • Personal navigation devices

Packaging

MLPD-8 2 X 2mm

Order Codes

  • SC4540ULTRT: Lead-free, WEEE and RoHS Compliant, 3000 pcs, Tape and Reel Only
  • SC4540EVB: SC4540 Evaluation Board
 
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