MIC3263 Boost Switching Regulator

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

Micrel's MIC3263 Boost Switching RegulatorMicrel, 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 15 mA to 30 mA. 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 100 Hz and 20 kHz 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 15 mA and 30 mA.

Features
  • 6 V to 40 V wide input voltage range
  • Drives 6 channels of up to 10 white LEDs
  • Programmable WLED current from 15 mA to 30 mA
  • 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 400 kHz to 1.8 MHz
  • High efficiency up to 90%
  • Low (<40 µA) shutdown current over temperature
  • Over temperature protection
  • Programmable overvoltage protection
  • -40°C to +125°C junction temperature range
  • Available in 24-pin 4 mm x 4 mm MLF® package

MIC3263

ImageManufacturer Part NumberDescriptionAvailable Quantity
MIC3263YML-TR datasheet linkIC LED DRVR RGLTR DIM 30MA 24MLFMIC3263YML-TRIC LED DRVR RGLTR DIM 30MA 24MLF4970 - Immediate
MIC3263YML-TR product page link
Published: 2010-03-10