LM2575S-15/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM2575S-15/NOPB is a SIMPLE SWITCHER® step-down voltage regulator from Texas Instruments, manufactured under the National Semiconductor brand lineage. It operates as a monolithic integrated circuit providing fixed 15V output with up to 1A load capability. The device features a wide input voltage range of 4V to 40V and utilizes a TO-263 (D²PAK) surface-mount package. Key electrical parameters include a switching frequency of 52kHz, an internal oscillator with ±10% tolerance, and output voltage accuracy of ±4%. It supports operation across a temperature range of -40°C to +125°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated buck topology with built-in frequency compensation and fixed-frequency oscillator
• Internal thermal shutdown and cycle-by-cycle current limiting for fault protection
• External shutdown pin enables low standby current consumption
• Requires minimal external components for standard design implementation

Voltage Regulators - DC DC Switching Regulators Applications

• General-purpose 15V DC power supply regulation
• Pre-regulation stage for downstream linear regulators
• Battery-powered systems requiring efficient step-down conversion
• Industrial control boards needing isolated or non-isolated 15V rails

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the suffix /NOPB confirms RoHS compliance and absence of lead-based materials. Confirm the manufacturer designation aligns with Texas Instruments specifications, as National Semiconductor assets were acquired. Ensure the package matches the TO-263 form factor required for your PCB footprint. Cross-reference the datasheet revision date to ensure compatibility with current design standards.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 15V output is required with moderate current demands up to 1A. It serves as a direct replacement for older National Semiconductor versions lacking the NOPB suffix. Consider the TO-263 package for its thermal performance compared to smaller SMD options. Evaluate the 52kHz switching frequency against EMI constraints and inductor size requirements for the specific application.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the LM2575 family of SIMPLE SWITCHER regulators, designed to replace traditional three-terminal linear regulators. The series offers improved efficiency and reduced heat dissipation. The LM2575S variant specifically denotes the surface-mount version in the TO-263 package. The NOPB suffix indicates a lead-free and environmentally friendly product compliant with EU directives.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

LM2575S-15 is the predecessor without the NOPB suffix. LM2575HVS-15/NOPB offers a higher input voltage range up to 60V. LM2575T-15/NOPB provides the same functionality in a through-hole TO-220 package.