LM2575S-3.3

Voltage Regulators - DC DC Switching Regulators Overview

The LM2575S-3.3 is a SIMPLE SWITCHER® 1A step-down voltage regulator manufactured by National Semiconductor, now part of Texas Instruments. It operates as a fixed-output DC/DC converter providing a stable 3.3V output with a maximum current capability of 1A. The device utilizes a buck topology and features a switching frequency of 150kHz. It supports a wide input voltage range up to 40V and functions within an operating temperature range of -40°C to +125°C (TJ). The component is housed in a surface-mount TO-263-5L package.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated monolithic switching regulator designed for high-efficiency step-down conversion
• Fixed internal feedback network ensures precise 3.3V output regulation without external resistors
• Includes built-in thermal shutdown and current limiting protection circuits
• Operates at a high switching frequency to minimize external passive component size

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for digital logic circuits
• Pre-regulation stages for downstream linear regulators
• Battery-powered systems requiring efficient voltage stepping
• General-purpose DC/DC power supply modules

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer origin, as National Semiconductor assets are held by Texas Instruments. Confirm the specific suffix indicates the TO-263-5L surface mount package. Ensure the version matches the required 150kHz switching frequency specification rather than older 52kHz variants. Check RoHS compliance status if environmental regulations apply to your assembly process.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output is required from a higher input voltage source. It is suitable for applications needing up to 1A load current with moderate efficiency requirements. Consider the TO-263-5L package for adequate thermal dissipation in surface-mount designs. Evaluate the 150kHz switching frequency against noise sensitivity constraints in the target circuit.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2575 family of SIMPLE SWITCHER regulators, which are widely used for non-synchronous buck conversions. The 'S' suffix typically denotes the surface-mount variant, while the '-3.3' specifies the fixed output voltage. This series is known for replacing traditional three-terminal linear regulators to reduce heat generation and improve overall system efficiency in power management designs.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2575HV-3.3: Higher input voltage tolerance variant. LM2575T-3.3: Through-hole alternative with identical electrical performance. LM2596-3.3: Higher current capability but different switching frequency.