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UV led application

Hi, I am working on a consumer product that needs to brighten and dim a UV led which runs at 3-3.3 V at 10 mA.  The circuit just needs to brighten and dim the LED every 5 seconds or so in order to conserve battery life.  Is it possible to do this with a LDO (low dropout voltage regulator) or is possible to use just passive components?

Scot