LM3530 White LED Driver

National Semiconductor's high efficiency white LED driver with
programmable ambient light sensing capability and I2C compatible interface

National Semiconductor - LM3530 White LED Driver National Semiconductor's LM3530 current mode boost converter supplies the power and controls the current in up to 11 series white LED's. The 839mA current limit and 2.7V to 5.5V input voltage range, makes the device a versatile backlight power source ideal for operation in portable applications. The LED current is adjustable from 0mA to 29.5mA 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.   LM3530 Product Brief

   Features    Applications
  • 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 2.7V to 5.5V input voltage range
  • 40V over-voltage protection
  • 500kHz fixed frequency operation
  • 839mA peak current limit
  • Low profile 12-bump micro SMD package
  • Smartphone LCD backlighting
  • Personal navigation LCD backlighting
  • 2 to 11 series white LED backlit display power source
  • RoHS Compliant

National Semiconductor
Part Number
Digi-Key Part Number Packaging Voltage -
LM3530UME-40/NOPB LM3530UME-40TR-ND Tape & Reel 2.7V ~ 5.5V 12-UFBGA LM3530 Product Brief
LM3530UME-40CT-ND Cut Tape
LM3530UME-40DKR-ND Digi-Reel®
LM3530UME-25A/NOPB LM3530UME-25A/NOPBTR-ND Tape & Reel
LM3530UME-25A/NOPBCT-ND Cut Tape
LM3530UME-25A/NOPBDKR-ND Digi-Reel®