|Micrel, Inc.'s MIC3223 is a constant current boost LED driver capable of a driving a series string of high power LEDs. The MIC3223 can be used in general lighting, bulb replacement, garden pathway lighting, and other solid state illumination applications. The MIC3223 is a peak current mode control PWM boost regulator, and the 4.5V and 20V operating input voltage range allows multiple applications from 5V or 12V bus.
The MIC3223 implements a fixed internal 1MHz switching frequency to allow for a reduction in the design footprint size. Power consumption has been minimized through the implementation of a 200mV feedback voltage that provides an accuracy of ±5%. The MIC3223 can be dimmed through the use of a PWM signal and features an enable pin for a low power shutdown state.
The MIC3223 is a very robust LED driver, which offers the following protection features: over voltage protection (OVP), thermal shutdown, switch current limiting, and under voltage lockout (UVLO).The MIC3223 is offered in a low profile exposed pad 16-pin TSSOP package.