The LM2575T is a monolithic integrated circuit that provides all the active functions for a step-down (buck) switching regulator. It is manufactured by Semtech Corporation and capable of driving a 1A load with excellent line and load regulation. Available in fixed output voltages of 3.3V, 5V, 12V, 15V, and an adjustable output version, these regulators are simple to use and require a minimum number of external components.

Applications:

• Simple High-Efficiency Step-Down (Buck) Regulators: Converting higher voltages to lower voltages efficiently.
• On-Card Switching Regulators: Providing regulated power to individual circuits or modules within a larger system.
• Positive to Negative Converters: Inverting the polarity of the input voltage.
• LCD Monitor Power Supplies: Delivering stable power to LCD panels and associated circuitry.
• Battery Chargers: Providing a controlled charging current and voltage for various battery types.

Features:

• 3.3V, 5V, 12V, 15V, and Adjustable Output Versions: Offers flexibility in selecting the desired output voltage.
• Adjustable Version Output Voltage Range: 1.23V to 37V ±4%: Allows for precise customization of the output voltage.
• Guaranteed 1A Output Current: Capable of supplying a continuous current of 1A to the load.
• Wide Input Voltage Range: 4V to 40V: Operates over a broad range of input voltages.
• Requires Only 4 External Components: Simplifies the design process and reduces BOM cost.
• 52 kHz Fixed Frequency Internal Oscillator: Provides a stable and predictable switching frequency.
• TTL Shutdown Capability: Enables the regulator to be turned off remotely.
• High Efficiency: Up to 88% efficiency, reducing power dissipation and heat generation.
• Uses Readily Available Standard Inductors: Simplifies component selection.
• Thermal Shutdown and Current Limit Protection: Protects the regulator from damage due to overheating or overcurrent conditions.

Benefits:

• Simplified Design: Minimal external components required, reducing design complexity and time.
• High Efficiency: Minimizes power losses and heat generation, improving overall system efficiency.
• Versatile: Adjustable output version allows for customized voltage settings.
• Reliable: Built-in protection features ensure robust and reliable operation.
• Cost-Effective: Reduces BOM cost and simplifies manufacturing.

Additional Details:

The LM2575T series operates at a fixed switching frequency of 52 kHz, which allows for the use of smaller and more cost-effective filter components. The regulator features a built-in thermal shutdown and current limit protection to prevent damage from overload conditions. The adjustable version allows the output voltage to be set using two external resistors. This device is commonly used in applications where a simple and efficient step-down voltage conversion is required. The package type is typically a TO-220.