LM2577SX-12

Voltage Regulators - DC DC Switching Regulators Overview

The LM2577SX-12/NOPB is a SIMPLE SWITCHER step-up voltage regulator from Texas Instruments, housed in a TO-263-5 surface-mount package. It delivers a fixed 12V output with a maximum switch current of 3A and supports input voltages up to 40V. The device operates at a switching frequency between 48 kHz and 56 kHz, enabling the use of compact external components. It functions as a boost or flyback converter and maintains operation across an extended temperature range from -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated high-current power switch rated for 3A continuous operation
• Fixed 12V output option eliminates external feedback resistor requirements
• Internal frequency compensation simplifies design and reduces component count
• Supports both boost and flyback topologies for versatile power conversion

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for distributed power systems
• Battery-powered equipment requiring voltage step-up
• General-purpose DC-to-DC conversion modules
• Flyback converter designs for isolated power supplies

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the complete part number includes the /NOPB suffix to ensure lead-free compliance and RoHS adherence. Confirm the specific suffix indicates the fixed 12V output variant rather than adjustable versions. Check datasheet revisions for any updates to thermal characteristics or recommended external component values before finalizing procurement specifications.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 12V output is required with up to 3A load capability. Ensure the input voltage remains within the specified 40V maximum limit. Consider the TO-263-5 package for adequate thermal dissipation in surface-mount applications. Verify that the operating frequency aligns with available inductor options for the target efficiency requirements.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM2577 series of SIMPLE SWITCHER regulators, which are designed for straightforward implementation of non-isolated DC-DC converters. The series includes adjustable and fixed voltage variants, supporting both buck and boost configurations depending on the specific model suffix and external circuitry connections.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2577SX-12/NOPB serves as the direct lead-free replacement for older LM2577SX-12 variants. Cross-reference with LM2577S-12 for functional equivalence, noting potential differences in packaging or environmental compliance status.