• 4.5V to 20V supply voltage
• 200mV feedback voltage with an accuracy of ±5%
• Step-up output voltage (boost) conversion up to 37V
• 1MHz switching frequency
• 100mO/3.5A internal power FET switch
• LEDs can be dimmed using a PWM signal
• User settable LED current (through external resistor)
• Externally programmable soft-start
• Protection features that include:
• Output over voltage protection (OVP)
• Under voltage lockout (UVLO)
• Over temperature protection
• Junction temperature range: -40°C to +125°C
• Available in an exposed pad 16-pin TSSOP package

The MIC3223 is a constant current boost LED driver capable of 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 application. 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 a 5V or a 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 and 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.