Using voltage divider in a circuit
Don't use voltage divider unless in these situations:


high impedance load
inaccurate voltage 
almost fixed current consumption circuits


If you have a digital circuit with different current consumption it means you have a variable load then your output voltage will vary in a wide range. 
This will affect performance of your circuit. 

For better efficiency I suggest use a two stage regulator, first stage is a switching regulator with efficiency up to 85%. This stage will deliver you a 5 volt regulated voltage.
In second stage use a linear regulator to produce 3.3 voltage.
In this scenario you will have a good efficiency behind a stable circuit for your digital circuits.

Always remember : power supply is the most important thing in a circuit for working stable and desirable.


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