Converting a 5 Volt controlled current source to 3.3V compatible
Research 1) I can go with a single chip solution, something like LT3092 But, is that chip can be controlled by a microcontroller? &lt;&lt;&lt;
    
  


Why not give a try to LTC3623 ?



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Or, considering that you'll use a microcontroller, maybe it would make sense to step back and rethink the concept. You could get a high side current sense amplifier like TSC101. Get it to the microcontroller's A/D converter.



Now what you need is just a high-side power thing fed by your microcontroller's PWM.