MP2126DN-LF

Overview

The MP2126DN-LF is a synchronous step-down converter and linear regulator integrated circuit manufactured by Monolithic Power Systems. It combines a 2.5A buck converter with a 500mA LDO in an SOIC-EP-8 package. The switching section operates at a fixed frequency of 1.25MHz, supporting input voltages up to 6V. The device features adjustable output voltage for the buck converter and provides a fixed output from the LDO. It includes thermal shutdown and current limit protection.

Feature Summary

• Integrates a high-efficiency synchronous buck converter with a low-noise LDO in a single compact package
• Provides independent power rails suitable for powering mixed-signal loads such as digital cores and analog peripherals
• Incorporates built-in protection mechanisms including thermal shutdown and cycle-by-cycle current limiting

Applications

• Portable electronic devices requiring multiple regulated voltage rails
• Embedded systems utilizing mixed-signal processors or microcontrollers
• Industrial control modules needing isolated analog and digital power supplies

Procurement Notes

Verify component authenticity through authorized distribution channels due to the discontinued status. Confirm package integrity and pin alignment against the SOIC-EP-8 specification before integration. Review the official datasheet for handling precautions related to moisture sensitivity classification. Ensure design compatibility with legacy system requirements given the end-of-life designation.

Selection Notes

Evaluate the combined current capability of the buck and LDO sections against total system load requirements. Consider the fixed 1.25MHz switching frequency when designing external inductors and capacitors for optimal ripple performance. Assess thermal dissipation capabilities within the SOIC-EP-8 footprint under maximum operating conditions. Verify input voltage range compatibility with the primary power source availability.

Part Context

This component belongs to the MP2126 series of dual-output power management ICs designed for space-constrained applications. It serves as a consolidated power solution replacing discrete regulator combinations. The integration reduces board area and simplifies bill of materials for portable electronics. The series targets applications requiring efficient DC-DC conversion alongside clean analog supply rails.

Replacement Considerations

Public confirmed substitute part numbers are not available.