Micrel, Inc. Supplier Page

MIC3263 Boost Switching Regulator

Micrel six-channel WLED driver for backlighting applications with flicker-free dimming

Click to Enlarge - MIC3263 LED DiagramMicrel, Inc.'s MIC3263 is a high-efficiency pulse width modulation (PWM) boost switching regulator that is optimized for constant-current WLED driver backlighting applications. The MIC3263 drives six channels of up to ten WLEDs per channel. Each channel is matched in current to within ±3% for constant brightness across the screen and can be programmed from 15mA to 30mA.The MIC3263 provides a very flexible dimming control scheme with better accuracy and noise immunity. The dimming frequency can be set to any value between 100Hz and 20kHz by an external resistor. The dimming ratio is determined by the duty cycle of a dimming ratio control input signal and can be set to one of 16 levels with a minimum ratio of 1%.The LED dimming current is set by an external resistor to allow programming of LED current between 15mA and 30mA.

  • 6V to 40V wide input voltage range
  • Drives 6 channels of up to 10 white LEDs
  • Programmable WLED current from 15mA to 30mA
  • Highly reliable operation with open and short LEDs
  • Accurate 16 dimming log levels sets the dimming ratio from 1-100%
  • Flicker-free dimming filters the jitter from the dimming control input signal and eliminates dimming flicker
  • Allows external dimming control
  • Accurate LED channel current matching ±3%
  • Programmable switching frequency from 400kHz to 1.8MHz
  • High efficiency up to 90%
  • Low (<40µA) shutdown current over temperature
  • Over temperature protection
  • Programmable overvoltage protection
  • -40°C to +125°C junction temperature range
  • Available in 24-pin 4mm x 4mm MLF® package
  • RoHS Compliant

Digi-Key Part Number Manufacturer Number Packaging Description Junction Temp Range
-40°C to +125°C
Available in Tape & Reel (TR-ND), Cut Tape (CT-ND), and custom Digi-Reel® (DKR-ND)

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