MIC4812 Datasheet, PDF (1/12 Pages) Micrel Semiconductor – High Current 6 Channel Linear WLED Driver with DAM™ and Ultra Fast PWM™ Control

MIC4812
High Current 6 Channel Linear WLED
Driver with DAM™ and Ultra Fast
PWM™ Control
General Description
Features
The MIC4812 is a high efficiency linear White LED
(WLED) driver designed to drive up to six high current
WLEDs for signage lighting. The MIC4812 provides the
highest possible efficiency as this architecture has no
switching losses present in traditional charge pumps or
inductive boost circuits. The MIC4812 provides six linear
drivers which maintain constant current for up to six
WLEDs. It features a typical dropout of 190mV at 100mA.
The MIC4812 features Dynamic Average Matching™
(DAM™) which is specifically designed to provide optimum
matching across all WLEDs. The high accuracy (±1%
typical) current regulated WLED channels ensure uniform
display illumination under all conditions. The brightness is
controlled through an Ultra Fast PWM™ interface
operating down to less than 1% duty cycle.
• High Efficiency (no Voltage Boost losses)
• Ultra Fast PWM™ control (200Hz to 500kHz)
• Input voltage range: 3.0V to 5.5V
• LED current range up to 100mA per channel
• Programmable LED current with external resistor
• Dropout of 190mV at 100mA
• Matching better than ±1% (typical)
• Current Accuracy better than ±1% (typical)
• Maintains proper regulation regardless of how many
channels are utilized
• 10-pin MSOP with ePad package
Applications
The MIC4812 is available in an 10-pin MSOP ePad
package with a junction temperature range of -40°C to
+125°C.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
• Billboard displays
• Marquee displays
• Instrument displays
• LCD display modules
____________________________________________________________________________________________________________
Typical Application
High Current Lighting (Six WLEDs)
Ultra Fast PWM, DAM and Dynamic Average Matching are trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
January 2011
M9999-010511-A