LM26400YSDX/NOPB

Voltage Regulators - DC DC Switching Regulators Overview

The LM26400YSDX/NOPB is a dual-channel synchronous step-down DC-DC converter manufactured by National Semiconductor. It integrates two independent buck regulators capable of delivering up to 2A per channel, supporting multi-rail system architectures. The device operates with an input voltage range extending from 3V to 38V and provides adjustable output voltages between 1.25V and 35V. Designed for high efficiency, it features a fixed switching frequency of 500kHz. The component is housed in a compact 16-pin WSON package, suitable for space-constrained applications requiring dual regulated power rails.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Dual integrated synchronous buck converters provide independent regulation for separate power rails
• Integrated high-side and low-side MOSFETs enable efficient step-down conversion without external diodes
• Adjustable output voltage allows flexible configuration for various load requirements
• Fixed 500kHz switching frequency supports the use of small passive components

Voltage Regulators - DC DC Switching Regulators Applications

• Multi-rail power distribution systems
• Portable electronic devices requiring multiple voltage levels
• Industrial control boards with mixed logic and peripheral supplies
• Embedded systems needing isolated or separate core and I/O power domains

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the specific suffix 'X' denotes the tape and reel packaging variant when ordering. Confirm compatibility with the 16-WSON footprint during PCB layout. Ensure the supplier source aligns with National Semiconductor (now Texas Instruments) authorized channels to guarantee authenticity. Cross-reference the full part number against official distributor catalogs to avoid confusion with non-NOPB variants or different package styles such as HTSSOP.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a design requires two independent, high-current buck regulators within a single IC footprint. It is appropriate for applications where board space is limited but dual output isolation or independent control is necessary. Consider the 500kHz frequency trade-off between component size and electromagnetic interference. Evaluate thermal performance based on the total current load across both channels within the WSON package constraints.

Voltage Regulators - DC DC Switching Regulators Part Context

This regulator belongs to the LM26400 series, which focuses on dual-channel power management solutions. It complements single-channel regulators like the LM26001 by offering higher integration density. The series is designed for modern electronics that demand efficient power conversion in compact form factors. It represents a transition toward highly integrated PMICs that reduce bill-of-materials complexity for multi-voltage designs.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Public confirmed substitute part numbers include LM26400YMH/NOPB and LM26400YSD/NOPB. These alternatives share identical electrical specifications and functionality. Differences are primarily restricted to the physical package type, specifically HTSSOP versus WSON. Verify pin-to-pin compatibility and thermal pad requirements before substituting.