The LM3444 is an adaptive constant off-time AC/DC buck (step-down) constant current
controller that provides a constant current for illuminating high power LEDs. The high-frequency
capable architecture allows the use of small external passive components. A passive PFC circuit
ensures good power factor by drawing current directly from the line for most of the cycle, and
provides a constant positive voltage to the buck regulator. Additional features include thermal
shutdown, current limit and VCC undervoltage lockout. The LM3444 is
available in a low profile 10-pin VSSOP package or an 8-lead SOIC package.
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