LM25115AMT

Power Supply Controllers, Monitors Overview

The LM25115AMT/NOPB is a secondary-side post-regulator and synchronous buck controller manufactured by Texas Instruments. It operates with an input voltage range of 0V to 42V and a supply voltage of 4.5V to 30V. The device supports switching frequencies from 50kHz to 1000kHz and features frequency synchronization, soft start, and thermal shutdown. It utilizes current and voltage control methods in a synchronous topology. The component is housed in a 16-TSSOP package (0.173"/4.40mm wide) or 16-WSON, rated for operation between -40°C and 125°C TJ. Supply current is typically 4mA, with UVLO thresholds at 4.15V/4.0V.

Power Supply Controllers, Monitors Feature Summary

• Synchronous secondary-side post-regulator topology for precise output regulation
• Frequency synchronization capability for noise reduction and parallel operation
• Integrated soft-start function to limit inrush current during startup
• Thermal shutdown protection to prevent damage under overheating conditions

Power Supply Controllers, Monitors Applications

• Secondary side post-regulation in isolated DC-DC converters
• Synchronous buck controller applications requiring tight load regulation
• Power supplies utilizing primary-side regulation with secondary correction
• Industrial and commercial power conversion systems

Power Supply Controllers, Monitors Procurement Notes

Verify the complete part number including suffixes such as /NOPB or MTX when ordering, as these indicate specific packaging and lead-free status. Confirm that the supplier provides the official Texas Instruments datasheet for the exact variant. Check RoHS compliance status and moisture sensitivity level (MSL 1) requirements for surface mount assembly processes. Ensure the procurement channel is authorized to guarantee component authenticity and traceability.

Power Supply Controllers, Monitors Selection Notes

Select this controller when secondary-side regulation is required to improve transient response and accuracy in isolated topologies. Consider the 42V input rating and 1A gate drive capability for driving external MOSFETs. Evaluate the need for frequency synchronization if multiple converters operate in close proximity. Verify that the 16-pin TSSOP or WSON package fits the available PCB footprint and thermal design constraints.

Power Supply Controllers, Monitors Part Context

The LM25115 is part of Texas Instruments' portfolio of power management integrated circuits designed for high-performance DC-DC conversion. It complements primary-side controllers by providing accurate output voltage regulation without requiring optocouplers or additional feedback loops across the isolation barrier. This approach enhances system reliability and reduces component count in isolated power supply designs.

Power Supply Controllers, Monitors Replacement Considerations

Compatible alternatives include LM25115MT/NOPB, LM25115SDX/NOPB, and LM25115MTX/NOPB. These variants share identical electrical specifications but differ in packaging type (TSSOP vs. WSON) and reel quantity. Verify pinout compatibility and thermal performance before substitution.