RS31326 - 16A/6A Dual-Input Power MUX with Priority Selection and Reverse Current Protection

RS31326 Dual-Input Power MUX for Intelligent Power Path Management

The RS31326 is a high-performance 16V dual-input Power MUX designed to intelligently manage power from multiple input sources while ensuring uninterrupted system operation. Integrated low R_DS(ON) back-to-back MOSFETs, priority-based source selection, and fast switchover enable seamless transitions between power inputs while minimizing output voltage droop.

Supporting input voltages from 2.97V to 16V, the RS31326 delivers up to 16A on Channel 1 and 6A on Channel 2, making it ideal for servers, networking equipment, industrial systems, embedded computing, and portable electronics. Adjustable current limiting, integrated current monitoring, reverse current protection, and comprehensive fault protection simplify system design while improving reliability.

Available in latch-off and auto-retry versions, the RS31326 provides designers with flexible fault management options for a wide range of power path applications.

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Intelligent Dual-Input Power Selection

Modern electronic systems frequently operate from multiple power sources, including AC adapters, batteries, redundant supplies, or auxiliary backup rails. The RS31326 automatically manages these power inputs by selecting the preferred source based on system priority while providing fast, seamless transitions whenever the active source becomes unavailable.

Individual enable inputs for each channel provide additional system flexibility, allowing designers to implement custom power sequencing and source management strategies.

Fast switchover between power sources minimizes output voltage disturbances, reducing the need for large output capacitance while maintaining stable operation for sensitive downstream circuitry.

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Optimized for Reliable Power Path Management

The RS31326 integrates low R_DS(ON) back-to-back MOSFETs on both input channels to maximize efficiency while preventing unwanted reverse current flow.

Key performance advantages include:

• Wide 2.97V to 16V operating range
• Up to 16A current capability on Channel 1
• Up to 6A current capability on Channel 2
• Low 6mΩ R_DS(ON) on Channel 1
• Low 18mΩ R_DS(ON) on Channel 2
• Fast source switchover to minimize voltage droop

These features make the RS31326 well suited for systems requiring efficient power distribution and continuous operation.

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Advanced Monitoring and System Control

Beyond power switching, the RS31326 provides integrated monitoring and configurable control features that simplify overall power system design.

Integrated management features include:

• Priority-based input selection
• Adjustable current limit
• Adjustable output soft-start
• Accurate current monitor (±2%)
• Individual enable control for each input
• Fault indication output

These capabilities allow designers to optimize startup behavior, monitor system loading, and improve overall power system reliability without requiring additional external circuitry.

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Comprehensive Protection for Mission-Critical Systems

Reliable power path management requires more than efficient switching. The RS31326 incorporates multiple protection features to safeguard both the power source and downstream electronics during fault conditions.

Integrated protection features include:

• Reverse current blocking using back-to-back MOSFETs
• Fast reverse current detection and recovery
• Adjustable current limiting
• Input overvoltage protection
• Undervoltage lockout (UVLO)
• Overtemperature protection
• Fault indication output

Two fault-response options allow designers to select the behavior that best matches their application:

• RS31326A – Latch-off operation after a fault
• RS31326B – Automatic retry after a fault

This flexibility enables optimized fault management for both mission-critical and consumer applications.

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Designed for Modern Computing and Industrial Systems

The RS31326 is ideal for applications requiring reliable source selection, redundant power inputs, or intelligent power path management.

Typical applications include:

• AI servers and enterprise computing
• Networking equipment
• Industrial control systems
• Embedded computing platforms
• Laptop and desktop computers
• Battery backup systems
• Redundant power supplies
• Communication equipment

Its combination of high current capability, integrated protection, and fast source switchover makes the RS31326 an excellent choice for systems where uninterrupted power delivery is essential.

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Simplify Dual-Input Power System Design

The RS31326 combines efficient power switching, intelligent source selection, and comprehensive system protection into a compact 4 × 4 mm LGA-25 package. By integrating low R_DS(ON) MOSFETs, current monitoring, adjustable current limiting, reverse current blocking, and configurable fault handling, it reduces external component count while improving overall system reliability.

Whether managing redundant power rails in networking equipment, seamlessly switching between adapters and batteries in portable electronics, or ensuring uninterrupted operation in industrial control systems, the RS31326 provides a complete dual-input Power MUX solution for modern power path management applications.

See more power MUX options here.