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• Part Recommendation: The LM317 adjustable voltage regulator is a popular choice for applications requiring different output voltages. It can output any voltage in the range of 1.25V to 37V with appropriate resistors to set the desired output voltage.
  Assumptions:
  • Your current requirement is within the LM317's capability (up to 1.5A under appropriate heat sinking).
  Connection example (assuming typical application):
  • Connect Adjust Pin of LM317 to Ground through a pair of resistors (R1 and R2) to set the output voltage.
  • Connect Input Pin of LM317 directly to your 5V source.
  • Connect Output Pin of LM317 to your load, which requires 2V.
  Equations to calculate R1 and R2 for 2V output:
  $$V_{out} = 1.25 \cdot (1 + \frac{R2}{R1}) + I_{adj}R2$$
  Assuming (I_{adj}) is small and can be neglected, you can solve for (R1) and (R2) based on the desired output voltage.

• Part Recommendation: If you're looking for a buck converter solution for higher efficiency, a part like the LM2596 could be suitable. The LM2596 is a step-down (buck) regulator that can output voltages ranging from 1.23V to 37V at up to 3A of output current.
  Assumptions:
  • Your current requirement is within what the LM2596 can provide.
  Connection Example:
  • Connect VIN to your 5V source.
  • Connect VOUT to your load, setting the output to 2V using the feedback resistors as specified in the datasheet.
  • Include the recommended capacitors at the input and output for stability, as detailed in the datasheet.

• Current Requirement: The required current for your application will impact the choice. Higher currents might favor the buck converter due to better efficiency and less heat generation.
• Efficiency: Buck converters are typically more efficient than linear regulators, especially at higher currents.
• Complexity and Size: Linear regulators are simpler and require fewer external components but may not be as efficient or compact as buck converters.