NX2124CSTR

Overview

The NX2124CSTR is a synchronous buck switching controller manufactured by Microchip Technology, designed for step-down DC-DC conversion applications. It operates with a fixed switching frequency of 300 kHz and supports a maximum duty cycle of 84%. The device features an adjustable output voltage reference of 360 mV and can drive external power stages capable of delivering up to 2 A of output current. It is housed in an 8-SOIC surface-mount package and functions within a junction temperature range of -40°C to +125°C. This component is classified as obsolete and is no longer recommended for new designs.

Feature Summary

• Implements synchronous buck topology for efficient step-down voltage regulation
• Utilizes adaptive on-time control architecture for stable transient response
• Provides high-temperature operation capability suitable for demanding environments

Applications

• Point-of-load power management in industrial systems
• Voltage regulation for embedded computing modules
• Power supply stages in telecommunications equipment

Procurement Notes

This component is officially designated as obsolete by the manufacturer. Availability is limited to existing stock from distributors or secondary markets. Verification of part authenticity and lot traceability is critical due to the end-of-life status. Buyers should confirm the specific manufacturing date code and ensure compliance with RoHS requirements before procurement. Alternative sourcing strategies or redesigns are strongly advised for long-term production needs.

Selection Notes

Engineers selecting this controller must account for its obsolete status when planning product lifecycles. The fixed 300 kHz frequency and 2 A current limit define the thermal and size constraints of the design. Compatibility with external MOSFETs driving the synchronous rectification stage requires careful gate drive analysis. The 360 mV reference voltage dictates the feedback resistor network configuration. Designers should verify that the 84% maximum duty cycle meets the input-to-output voltage ratio requirements of their specific application.

Part Context

The NX2124CSTR belongs to the NX2124 family of synchronous buck controllers from Microchip Technology. It shares architectural similarities with other members of the series but is distinguished by its specific packaging and parameter set. As a legacy component, it represents an earlier generation of power management ICs compared to newer offerings in the company's portfolio. Its documentation remains available for reference, though active support and manufacturing have ceased.

Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source data. Due to the obsolete status, engineers should consult Microchip Technology's official transition notices or contact sales representatives for qualified replacement recommendations tailored to specific design constraints.