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 SC4538

Semtech SC4538

High Efficiency Boost Converter for up to 10 LEDs

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