LM2576SX-3.3/E7001841

Voltage Regulators - DC DC Switching Regulators Overview

The LM2576SX-3.3 is a monolithic integrated circuit from the SIMPLE SWITCHER series, functioning as a non-synchronous step-down DC-DC converter. It provides a fixed 3.3V output with a maximum load current of 3A. The device operates with an input voltage range of 4V to 40V and utilizes a fixed internal oscillator frequency of 52kHz. Key electrical parameters include a typical efficiency of 88%, an output voltage tolerance of ±4% under specified conditions, and a quiescent current of 5mA. The component supports operation across a temperature range of -40°C to 125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Provides all active functions for a step-down switching regulator within a single IC
• Features a fixed-frequency internal oscillator for simplified design
• Includes built-in thermal shutdown and cycle-by-cycle current limiting for fault protection
• Offers external shutdown capability with low standby current consumption

Voltage Regulators - DC DC Switching Regulators Applications

• Directly replaceable three-terminal linear regulators in systems requiring reduced heat dissipation
• Pre-regulator stages for downstream switching regulators
• Efficient buck converters for battery-powered applications

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the specific suffix matches the required package type and lead-free status. Confirm the manufacturer source aligns with original equipment manufacturer specifications to ensure authenticity. Check for any specific tape-and-reel or tube packaging requirements relevant to the assembly process. Ensure the part number corresponds exactly to the fixed 3.3V output variant.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output at up to 3A is required with minimal external components. It is suitable for designs prioritizing simplicity and cost-effectiveness over high-frequency operation. Consider the TO-263 (D2PAK) package for adequate thermal management if heatsinking is not utilized. Evaluate the 52kHz switching frequency against EMI constraints compared to higher-frequency alternatives.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2576 family of SIMPLE SWITCHER regulators, which are designed for ease of use and flexibility. The family includes adjustable versions and other fixed voltage outputs such as 5V, 12V, and 15V. The LM2576 series serves as a high-efficiency alternative to traditional linear regulators, significantly reducing the need for large heat sinks in power supply designs.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

• LM2576SX-3.3/NOPB