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MIC3263YML TR

Description
led lighting drivers six channel Wled driver for Backlighting applications
Categorysemiconductor    Other integrated circuit (IC)   
File Size925KB,33 Pages
ManufacturerMicrochip
Websitehttps://www.microchip.com
Environmental Compliance  
Download Datasheet Parametric View All

MIC3263YML TR Overview

led lighting drivers six channel Wled driver for Backlighting applications

MIC3263YML TR Parametric

Parameter NameAttribute value
ManufactureMicrel
Product CategoryLED Lighting Drivers
RoHSYes
Mounting StyleSMD/SMT
Package / CaseMLF-24
PackagingReel
Factory Pack Quantity5000
MIC3263
Six-Channel WLED Driver for
Backlighting Applications with
Flicker-Free Dimming
General Description
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 400 KHz to 1.8 MHz 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.
The MIC3263 is available in a low-profile 24-pin 4mm x
4mm MLF® package and has a junction temperature
range of
−40°C
to
+125°C.
Data sheets and support documentation can be found on
Micrel’s web site at:
www.micrel.com
.
Features
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% 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
Available in 24-pin 4mm x 4mm MLF® package
Applications
White LED driver for backlighting
Notebooks
LCD Panels and Monitors
Multimedia players
Navigation equipment
Gaming systems
Video poker
Slot machines
_________________________________________________________________________________________________________________________
MLF is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
January 2010
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