Status: End of Life
The MIC3291 is a PWM switching boost regulator that is optimized for constant current white LED (WLED) driver applications. The MIC3291 features an internal Schottky diode, allowing an efficient DC/DC solution that requires only four external components.
The MIC3291 allows for a single-wire simple digital interface to control the dimming over 16 steps with a linear scale. The preprogramming feature allows the user to select any one of the 16 WLED current levels as the start up brightness level.
The feedback voltage of the MIC3291 is only 250mV, allowing high efficiency while retaining excellent accuracy for the WLED current.
The MIC3291 implements a constant frequency 1.2MHz PWM control scheme. The high frequency PWM operation saves board space by reducing external component sizes. The 1.2MHz PWM scheme also reduces switching noise and ripple to the input power source.
The 2.5V to 6.5V input voltage range of the MIC3291 allows direct operation from single cell Li-Ion as well as 3- to 4-cell NiCad/NiMH/Alkaline batteries. Battery life is preserved with a low 1µA shutdown current.
The MIC3291 is available in a low profile Thin SOT23 6-pin and 2mm x 2mm MLF® 8-pin packages with a junction temperature range of -40°C to +125°C.
Please consider this device MIC3289
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