1. Switching Regulator with Adjustable Output:

• High Efficiency: Ideal for high-current applications due to their efficient power conversion, reducing heat generation.
• Wide Input Voltage Range: Often handle a broad range of input voltages.
• Compact Size: Typically smaller than linear regulators with similar current ratings.
• Adjustability: Some switching regulator ICs offer built-in adjustable output voltage control.

Examples of Switching Regulator ICs with Adjustable Output:

LM2596

LM2576

MP1584

2. Linear Regulator with External Pass Transistor and Adjustable Control:

• Simpler Design: Uses a linear regulator IC, an external power transistor, and adjustable control components.
• Less Efficient: Dissipates excess power as heat, requiring adequate heatsinking.

Components:

• Linear Regulator IC: Provides basic voltage regulation, but with a limited current output.
• Power Transistor: Handles high current flow.
• Heatsink: Dissipates heat from the transistor.
• Adjustable Resistors: Allow for fine-tuning of the output voltage.

Additional Considerations:

• Heat Dissipation: Both switching and linear regulators with high currents generate heat. Provide sufficient heatsinking.
• Input Voltage Range: Ensure the regulator can handle your input voltage range.
• Desired Adjustment Range: Choose a regulator that offers the level of output voltage adjustability you need.
• Safety Features: Consider regulators with overcurrent protection, thermal protection, and short-circuit protection.

Specific Circuit Design and Component Selection:

• Depend on your exact current, voltage, and adjustability requirements.
• Consult datasheets and application notes for the chosen regulator ICs for detailed guidance.