Texas Instruments

LM2576SX-5.0

LM2576SX-5.0 Description

The LM2576SX-5.0 from Texas Instruments is a 3A, 5V fixed-output step-down (buck) switching regulator designed for wide input voltage (4V to 40V) applications. Housed in a 6-pin DDPAK (5+Tab) package, it integrates a high-efficiency switching controller with a robust 58kHz switching frequency, minimizing external component count while delivering 77% typical efficiency. This non-isolated DC-DC converter is optimized for surface-mount designs, featuring a thermally enhanced tab for improved heat dissipation.

LM2576SX-5.0 Features

• Wide Input Range: Operates from 4V to 40V, accommodating fluctuating power sources like automotive or industrial supplies.
• High Current Output: Delivers 3A continuous current with 5V fixed output, ideal for powering medium-load circuits.
• Efficiency & Thermal Performance: 77% typical efficiency reduces power loss, while the DDPAK package (max 4.83mm height) ensures thermal stability up to 125°C.
• Simplified Design: Requires minimal external components due to integrated frequency compensation and fixed-frequency PWM control (58kHz).
• Robust Packaging: Tape and Reel (T/R) packaging supports automated assembly, and the tab connection enhances PCB thermal management.
• Regulatory Notes: Non-RoHS compliant and flagged for SVHC (Substances of Very High Concern), requiring careful compliance review for restricted markets.

LM2576SX-5.0 Applications

• Industrial Power Systems: Suitable for PLC modules, motor controllers, and 24V/12V bus converters due to wide input tolerance.
• Automotive Electronics: Powers infotainment systems, sensors, and LED drivers in 12V/24V vehicles (note: not PPAP-certified).
• Consumer/Telecom: Efficiently steps down battery or adapter voltages (e.g., 24V to 5V) for routers, IoT devices, and portable equipment.
• Embedded Systems: Ideal for FPGA/ASIC power rails where stable 5V output and compact footprint are critical.

Conclusion of LM2576SX-5.0

The LM2576SX-5.0 balances performance, simplicity, and cost for medium-power DC-DC conversion. Its wide input range, high current capability, and thermal resilience make it a pragmatic choice for industrial and automotive designs, though SVHC and RoHS restrictions may limit use in regulated markets. Engineers benefit from its reduced BOM complexity and DDPAK’s thermal advantages, positioning it as a reliable solution for non-isolated 5V power domains.