Adjustable output voltage regulators are versatile components in electronic design, allowing for custom voltage levels to be set according to the needs of the specific application. These regulators are often available in the TO-220 package, which is favored for its ability to dissipate heat efficiently, making it suitable for applications requiring moderate to high currents. Here is a list of several adjustable output voltage regulator ICs that are commonly available in TO-220 packages:

1. LM317

The LM317 is one of the most widely used adjustable linear voltage regulators. It offers an output voltage range from 1.25V to 37V and can deliver up to 1.5A of output current. The output voltage is set with two external resistors.

2. LM338

The LM338 is a higher current version of the LM317, capable of supplying up to 5A of output current. It maintains the same voltage range of 1.25V to 37V. It's ideal for more power-hungry applications.

3. LM350

Similar to the LM317 but designed to handle up to 3A of output current, making it a middle ground between the LM317 and LM338 in terms of current capacity.

4. LT1083 / LT1084 / LT1085

A series of adjustable regulators from Linear Technology (now part of Analog Devices) that offer output currents of 7.5A, 5A, and 3A, respectively. They provide low dropout, high efficiency, and are adjustable from 1.25V to output voltages that are near the input voltage level.

5. LM337

The LM337 is the negative complement to the LM317, offering an adjustable output range from -1.25V to -37V with up to 1.5A of output current. It's used in applications requiring a negative adjustable power supply.

6. TL783

The TL783 is designed for high voltage applications, capable of adjusting from 1.25V up to 125V, with a maximum output current of 700mA. It's suitable for applications requiring higher voltages.

Choosing the Right Adjustable Regulator

When selecting an adjustable voltage regulator in a TO-220 package, consider the following factors:

• Output Current Needs: Ensure the regulator can support the maximum current your application requires.
• Voltage Range: Verify that the regulator covers the desired output voltage range.
• Thermal Management: The TO-220 package facilitates heat dissipation, but ensure your design adequately addresses thermal issues, possibly with heatsinks.
• Application Requirements: Consider the specific needs of your application, including efficiency, dropout voltage, and package size constraints.