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 SC4538

Semtech SC4538

High Efficiency Boost Converter for up to 10 LEDs

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The SC4538 is designed to regulate current for a series chain of white LEDs in LCD backlighting applications where small size and high efficiency 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 — 2.8V to 5.5V
  • 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 filtered
  • Over-voltage protection — 38V (min.)
  • Under-voltage lockout (UVLO)
  • Thermal shutdown
  • Shutdown current — <1μA (typical)
  • Ultra-thin package — 2mm x 2mm x 0.6mm
  • Lead-free package, WEEE and RoHS compliant

Applications


  • DSLR, DSC, and Video Cameras
  • Cellular Handsets
  • Portable Media Players
  • Personal navigation system
  • Satellite radio
  • Handheld video games

Packaging

MLPD-8

Order Codes

  • SC4538ULTRT: Lead-free, RoHS and WEEE compliant, 3000 pcs. Tape & Reel
  • SC4538EVB: SC4538 Evaluation Board
 
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