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MIC4802
High Efficiency 800mA Single Channel
Linear WLED Driver with
Ultra Fast PWM? Control
General Description
Features
The MIC4802 is a high efficiency White LED (WLED)
driver designed to drive a single LED up to 800mA. The
MIC4802 constant current driver is designed to drive high
power LED’s in various lighting applications. The MIC4802
provides the highest possible efficiency as this architecture
has no switching losses present in traditional charge
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High Efficiency (no Voltage Boost losses)
Ultra Fast PWM? control (200Hz to 500kHz)
Input voltage range: 3.0V to 5.5V
Dropout of 280mV at 800mA
Programmable LED current with external resistor
pumps or inductive boost circuits. It features a typical
dropout of 280mV at 800mA. This allows the LEDs to be
driven directly from the voltage source eliminating
switching noise/losses present with the use of boost
circuitry. The high accuracy (±1% Typical) current
regulated WLED channel ensures uniform display
illumination under all conditions. The brightness is
controlled through an Ultra Fast PWM? Control interface
operating down to less than 1% duty cycle.
? Current accuracy of ±1% typical
Applications
? Bill board displays
? Marquee displays
? Instrument displays
? Architectural lighting
The MIC4802 is available in the 8-pin SOIC 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 .
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Typical Application
High Current Lighting Schematic
Ultra Fast PWM is a 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 2011
M9999-013111-B
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