LED Drivers
  • SC668
    • 8 LED Light Management Unit Automatic Dropout Prevention , Ambient Light Sense Input, PWM Dimming, and 4 LDOs
  • SC667
    • 7 LED Light Management Unit Automatic Dropout Prevention, Ambient Light Sense Input, PWM Dimming, and 4 LDOs
  • SC662
    • Backlight Driver for 6 LEDs with SemPulse® Interface
  • SC657
    • Charge Pump LED Driver for 5BL + SemPulse Interface
  • SC653
    • Charge Pump LED Driver for 4BL + 2LDO + SemPulse Interface
  • SC5010H
    • High Efficiency 8-Channel LED Driver with I2C Interface and Phase-Shifted PWM Dimming
  • SC5010
    • High Efficiency 8-Channel LED Driver with I2C Interface and Phase-Shifted PWM Dimming
  • SC4541
    • High Frequency LED Driver with Integrated Schottky and Simple Interconnect
Semtech SC4540

Semtech SC4540

High Efficiency Boost Converter for up to 10 LEDs

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