RS31325 - 16V, 12A Dual-Input Power MUX with 16A Parallel Operation

RS31325 Dual-Input Power MUX for Intelligent Power Path Management

The RS31325 is a high-performance 16V dual-input Power MUX designed to intelligently manage power from multiple input sources while ensuring continuous operation of critical electronic systems. Featuring integrated low R_DS(ON) back-to-back MOSFETs, priority-based source selection, and fast source switchover, the RS31325 enables seamless transitions between power sources while minimizing output voltage droop.

Supporting an operating voltage range of 2.95V to 16V, the RS31325 delivers up to 12A continuous current when operating from a single input or 16A continuous current when both channels are active. Integrated current monitoring, adjustable current limiting, configurable fault response, and comprehensive protection features simplify system design while improving reliability.

Whether managing redundant power supplies, switching between an adapter and battery, or providing uninterrupted power to computing and industrial equipment, the RS31325 delivers intelligent power path management in a compact 4 × 4 mm LGA-25 package.

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Intelligent Power Source Selection

Modern electronic systems frequently require multiple power sources to improve availability, enable battery backup, or provide seamless transitions between redundant supplies. The RS31325 automatically manages these inputs using programmable priority selection, ensuring the preferred source powers the load while maintaining uninterrupted system operation.

Individual enable inputs provide designers with additional flexibility for implementing custom startup sequencing, system-level power management, and source prioritization.

Fast switchover between input sources minimizes output voltage disturbances, reducing the need for excessive output capacitance while maintaining stable power delivery to sensitive downstream electronics.

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High-Efficiency Power Path Performance

The RS31325 integrates low R_DS(ON) back-to-back MOSFETs that reduce conduction losses while preventing reverse current flow between input sources.

Key performance advantages include:

• Wide 2.95V to 16V operating voltage range
• Up to 12A continuous current with a single active input
• Up to 16A continuous current with both channels active
• Low 12mΩ R_DS(ON) per channel
• Fast source switchover minimizes output voltage droop
• Accurate current monitoring (±2%)

These capabilities make the RS31325 well suited for systems requiring efficient power distribution, low power loss, and uninterrupted operation.

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Intelligent Monitoring and Configurable Control

Beyond seamless source selection, the RS31325 integrates advanced monitoring and control functions that simplify system-level power management.

Integrated management features include:

• Priority-based input selection
• Adjustable current limit
• Adjustable output soft-start
• Accurate current monitoring
• Individual enable control for each input
• Fault indication output

These integrated features reduce external component count while giving designers greater control over system startup, load management, and fault reporting.

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Comprehensive System Protection

Reliable power path management requires more than intelligent switching. The RS31325 incorporates multiple protection mechanisms to safeguard both the power sources and downstream electronics during abnormal operating conditions.

Integrated protection features include:

• Reverse current blocking with integrated back-to-back MOSFETs
• Fast reverse current detection and recovery
• Adjustable overcurrent protection
• Input undervoltage lockout (UVLO)
• Input overvoltage protection
• Overtemperature protection
• Fault indication output

Unlike fixed-response devices, the RS31325 allows designers to select either Latch-off or Auto-Retry operation following overvoltage, overcurrent, or overtemperature faults. This flexibility allows a single device to support applications ranging from mission-critical infrastructure to consumer electronics.

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Ideal for Redundant and Multi-Source Power Systems

The RS31325 is optimized for applications requiring reliable source selection and intelligent power path management.

Typical applications include:

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

Its balanced dual-channel architecture makes the RS31325 particularly well suited for applications where either input source may be required to deliver significant load current.

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Simplify Intelligent Power Path Design

The RS31325 combines efficient power switching, intelligent source selection, configurable fault handling, and comprehensive system protection into a compact, highly integrated solution. By integrating low R_DS(ON) MOSFETs, current monitoring, adjustable current limiting, reverse current blocking, and programmable fault response, the device reduces design complexity while improving efficiency and system reliability.

As part of Reed Semiconductor’s Power MUX family, the RS31325 delivers Smart Power. Seamless Switching. Whether managing redundant power rails, selecting between battery and external power, or protecting mission-critical systems from power interruptions, the RS31325 provides an intelligent and reliable solution for modern power path management applications.

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