LM3530 White LED Driver

Texas Instruments' high efficiency white LED driver with programmable ambient light sensing capability and I2C compatible interface

image of Texas Instruments' LM3530 White LED DriverNational Semiconductor's LM3530 current mode boost converter supplies the power and controls the current in up to 11 series white LED's. The 839 mA current limit and 2.7 V to 5.5 V input voltage range, makes the device a versatile backlight power source ideal for operation in portable applications. The LED current is adjustable from 0 mA to 29.5 mA via an I2C compatible interface. The 127 different current steps and eight different maximum LED current levels give over 1000 programmable LED current levels. Additionally, PWM brightness control is possible through an external logic level input.

Features
  • Drives up to 11 LED's in series
  • 1000:1 dimming ratio
  • 90% efficiency
  • Programmable dual ambient light sensor inputs with internal ALS voltage setting resistors
  • I2C programmable logarithmic or linear brightness control
  • External PWM input for simple brightness adjustment
  • True shutdown isolation for LED's and ambient light sensors
  • Internal soft-start limits inrush current
  • Wide 2.7 V to 5.5 V input voltage range
  • 40 V over-voltage protection
  • 500 kHz fixed frequency operation
  • 839 mA peak current limit
  • Low profile 12-bump micro SMD package
Applications
  • Smartphone LCD backlighting
  • Personal navigation LCD backlighting
  • 2 to 11 series white LED backlit display power source

White LED Driver

ImageManufacturer Part NumberDescriptionTypeTopologyAvailable Quantity
LM3530UME-40/NOPB datasheet linkIC LED DRIVER RGLTR DIM 12DSBGALM3530UME-40/NOPBIC LED DRIVER RGLTR DIM 12DSBGADC DC RegulatorStep-Up (Boost)231 - Immediate
1500 - Factory Stock
LM3530UME-40/NOPB product page link
Published: 2011-01-24