The MIC4811/MIC4812 from Micrel are six-channel, constant-current sink LED drivers targeting billboard, marquee, instrument and other large, general-purpose LED displays.
The devices are high-efficiency linear white LED (WLED) drivers designed to drive up to six high-current WLEDs for signage lighting. They provide high efficiency at low source voltages as this architecture has no switching losses present in traditional charge pumps or inductive boost circuits. The drivers maintain constant current for up to six WLEDs and feature a typical dropout of 100 mV at 50 mA (MIC4811) and 190 mV at 100 mA (MIC4812).
The ICs feature 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.
The MIC4811 and MIC4812 are available in a 10-pin MSOP package and a 10-pin MSOP exposed pad package respectively, with a junction temperature range of
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