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MIC3263

Six Channel WLED Driver for Backlighting Applications

Status: In Production

Features:

  • 6V to 40V wide input voltage range
  • Drives six 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% to 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%
  • Accurate initial LED current setting ±2%
  • Programmable switching frequency from 400kHz to 1.8MHz
  • High efficiency up to 90%
  • Low (<40µA) shutdown current over temperature
  • Over temperature protection
  • Programmable over-voltage protection
  • -40°C to -125°C junction temperature range
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Overview
Documents
Development Environment
Similar Devices
RoHS Information
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Device Overview

Summary

The 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.

The dimming ratio of the MIC3263 is fixed to 16 log levels to better match the sensitivity of the human eye. Each of the dimming levels has hysteresis to avoid skipping between levels and allow for high noise immunity.

The MIC3263 has a programmable PWM switching frequency from 400kHz to 1.8MHz to allow small inductor sizes. The 6V to 40V wide input voltage range of MIC3263 allows direct operation from 6V or high cell count Li-Ion batteries commonly found in notebook computers.

Additional Features
    • 6V to 40V wide input voltage range
    • Drives six 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% to 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%
    • Accurate initial LED current setting ±2%
    • Programmable switching frequency from 400kHz to 1.8MHz
    • High efficiency up to 90%
    • Low (<40µA) shutdown current over temperature
    • Over temperature protection
    • Programmable over-voltage protection
    • -40°C to -125°C junction temperature range

     

    Parametrics
    Name
    Value
    Topology
    Boost
    +Vin min (V)
    6
    +Vin max (V)
    40
    Output Current
    2A BJT
    Dimming
    PWM
    Package
    VDFN
    Product Type
    LED Backlight
    VOUT
    40
    llim Typ (A)
    2.4
    lq Typ
    6.5mA
    Vfb (V)
    2.36
    Tol Typ %
    ±3
    Duty Cycle Max
    0.9
    Freq (Hz)
    400K-1.8M
    OVP
    Yes
    VEN (V)
    1.3
    EN
    Yes
    Ceramic Cap
    Yes
    Θja (C/W)
    43

    Documents

    Jump to:

    User Guides

    Development Environment

    • Demo & Evaluation Boards
    Demo & Evaluation Boards
    MIC3263YML Evaluation Board
    MIC3263YML Evaluation Board ( MIC3263YML-EV )

    This evaluation board (EVB) is designed for the MIC3263. The 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 low-power WLEDs per channel. Each channel is matched in current to within ±3% for constant brightness across the screen and can...

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    RoHS Information

    Part Number
    Device Weight (g)
    Shipping Weight (grams)
    Lead Count
    Package Type
    Package Width
    Solder Composition
    JEDEC Indicator
    RoHS
    China EFUP
    MIC3263YML-TR
    0.042200
    0.204000
    24
    VQFN
    4x4x0.9mm
    NiPdAu
    e4
    To see a complete listing of RoHS data for this device, please Click here
    Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

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