LM2577SX-12/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2577SX-12/NOPB is a step-up switching voltage regulator manufactured by Texas Instruments, formerly National Semiconductor. It operates within an input voltage range of 4V to 40V and delivers up to 3A output current. The device features a fixed 12V output voltage with a maximum switching frequency of 62kHz. It utilizes pulse width modulation control mode for efficient power conversion. The component is housed in a TO-263 (D2PAK) package with five pins, designed for surface-mount applications requiring robust thermal performance.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated monolithic converter architecture simplifies design
• Fixed 12V output eliminates external feedback resistor networks
• Internal high-current switch reduces external component count
• Thermal shutdown protection ensures operational safety

Voltage Regulators - DC DC Switching Regulators Applications

• Industrial power supply systems
• Battery-powered equipment step-up circuits
• Telecommunications infrastructure power regulation
• Automotive electronics voltage boosting

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the manufacturer designation carefully, as the part originates from National Semiconductor but is now managed by Texas Instruments. Confirm the suffix NOPB indicates lead-free and RoHS compliance status according to current datasheets. Ensure the ordering part number matches the specific package variant required for your PCB layout. Cross-reference the date code and lot information to verify authenticity and traceability through authorized channels.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 12V output is required from a variable or higher input source. The 3A current capability suits moderate load applications without excessive heat sinking. Consider the 62kHz switching frequency for EMI constraints compared to higher-frequency alternatives. Evaluate the TO-263 package thermal resistance against your ambient temperature requirements and board copper area availability for adequate dissipation.

Voltage Regulators - DC DC Switching Regulators Part Context

This regulator belongs to the LM2577 series of SIMPLE SWITCHER products. The SX suffix denotes the D2PAK surface-mount package. The -12 suffix specifies the fixed 12V output version. The NOPB suffix confirms non-Pb (lead-free) packaging. This family provides a cost-effective solution for DC-DC conversion tasks requiring minimal external components and reliable performance in various industrial environments.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2577SX-12-NOPB is listed as a related variant with identical electrical specifications. Verify pinout compatibility and thermal pad configuration before substitution. Other series members like LM2577ADJ offer adjustable outputs but require different external components. Direct replacement requires matching the TO-263 package dimensions and mounting hole patterns.