RS31322 Intelligent Dual-Input Power MUX for Advanced Power Path Management

The RS31322 is a high-performance 22V dual-input Power MUX designed to intelligently manage multiple power sources while ensuring reliable, uninterrupted power delivery. Featuring programmable input source priority, manual source selection, and integrated back-to-back MOSFETs, the RS31322 provides flexible power path management for systems requiring advanced source control and seamless input transitions.

Supporting an operating voltage range of 2.97V to 22V and delivering up to 4.5A continuous output current, the RS31322 combines fast 1µs source switchover, low quiescent current, and comprehensive protection features in a compact 2 × 2.5 mm VQFN-12 package. Adjustable timing, programmable priority selection, and integrated protection reduce design complexity while improving system reliability across a wide range of industrial, embedded, and battery-powered applications.

Intelligent Power Source Selection

Modern electronic systems often operate from multiple power sources, including batteries, USB power, AC adapters, backup supplies, and redundant power rails. The RS31322 intelligently manages these inputs by allowing designers to define source priority or manually select the desired power source to meet specific system requirements.

Unlike fixed-priority Power MUX devices, the RS31322 provides programmable source management, enabling designers to optimize power distribution for battery charging, redundant power architectures, or application-specific power sequencing.

Fast 1µs source switchover minimizes output voltage droop during transitions, helping maintain stable operation while reducing the need for excessive output capacitance.

Flexible Power Path Control

The RS31322 provides several configurable features that allow designers to tailor power path operation to their application.

Integrated control features include:

• Programmable input source priority
• Manual input source selection
• Adjustable input settling time
• Adjustable output soft-start
• Channel status indication

These capabilities simplify system integration while providing the flexibility required for advanced power management architectures.

Efficient Power Delivery with Low Operating Current

Designed for efficient operation, the RS31322 minimizes power loss while supporting a broad range of supply voltages.

Key performance advantages include:

• Wide 2.97V to 22V operating voltage range
• Up to 4.5A continuous output current
• Fast 1µs source switchover
• Low operating quiescent current
• Low 10µA shutdown current

These characteristics make the RS31322 well suited for portable equipment, embedded electronics, and systems that remain powered for extended periods.

Integrated Protection Improves System Reliability

Reliable power path management requires more than intelligent source selection. The RS31322 incorporates multiple protection features that safeguard both the power sources and downstream electronics during abnormal operating conditions.

Integrated protection includes:

• Reverse current blocking using integrated back-to-back MOSFETs
• Adjustable overcurrent protection (OCP)
• Adjustable input overvoltage protection (OVP)
• Overtemperature protection
• Channel status indication

Together, these features help improve overall system robustness while reducing the need for additional external protection circuitry.

Compact Solution for Modern Power Systems

The RS31322 integrates advanced power management capabilities into a compact 2 × 2.5 mm VQFN-12 package, helping designers reduce PCB area while simplifying implementation.

Typical applications include:

• Battery-powered equipment
• Battery management systems
• Multiple power source applications
• Power path management
• Redundant and standby power systems
• Industrial control systems
• Embedded computing
• Surveillance equipment
• Telematics

Its combination of compact size, configurable source management, and integrated protection makes the RS31322 an excellent solution for space-constrained systems requiring intelligent power path control.

Smart Power. Seamless Switching.

The RS31322 combines intelligent source selection, efficient power delivery, and comprehensive protection into a highly integrated Power MUX solution. Programmable priority selection, manual source control, adjustable timing, and fast 1µs source switchover give designers the flexibility to optimize power path operation for a wide variety of applications.

As part of Reed Semiconductor’s Power MUX family, the RS31322 delivers Smart Power. Seamless Switching. Whether managing redundant power rails, selecting between battery and external power sources, or implementing sophisticated power sequencing, the RS31322 provides an intelligent, compact, and reliable solution for next-generation power management systems.