RS31317 - Precision eFuse with Programmable Protection and Current Monitoring

RS31317 4.5V to 16V, 15A Intelligent eFuse for Flexible Power Rail Protection

Modern servers, networking equipment, industrial automation systems, and communications platforms often include multiple layers of power protection. In these applications, designers may prefer to manage input overvoltage protection at the system level while still requiring intelligent current limiting, hot-swap control, and fault management at the point of load.

The RS31317 is a highly integrated 15A intelligent eFuse that provides advanced hot-swap protection, programmable fault management, precision current monitoring, and flexible power-path control for 4.5V to 16V power rails. Unlike fixed-threshold overvoltage devices, the RS31317 does not include a fixed input overvoltage shutdown threshold, giving designers complete freedom to implement system-level overvoltage protection that best matches their application.

Integrating a low 2.0mΩ power MOSFET, programmable current limiting, configurable fault recovery, startup control, and comprehensive protection into a compact 4 × 4 mm LGA-26 package, the RS31317 simplifies power system design while maximizing application flexibility.

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Designed for Systems with External Overvoltage Protection

Many enterprise and industrial platforms already incorporate surge suppression, transient voltage suppressors (TVS), upstream hot-swap controllers, or redundant power management circuitry.

The RS31317 is optimized for these applications by allowing designers to implement their preferred overvoltage strategy without an integrated shutdown threshold limiting system operation.

Typical applications include:

• AI servers
• Enterprise storage
• Networking switches
• Telecommunications equipment
• Industrial automation
• FPGA and ASIC platforms
• Embedded computing
• Distributed 12V power architectures

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Intelligent Protection Beyond Traditional eFuses

The RS31317 continuously monitors operating conditions while providing comprehensive protection against overloads and fault conditions.

Integrated protection features include:

• Adjustable 2A to 15A current limit
• Fast short-circuit protection (<400 ns typical)
• Programmable overcurrent blanking timer
• Adjustable output slew rate
• Adjustable input UVLO
• Integrated thermal protection
• Precision analog current monitor
• Power Good output

These programmable functions allow designers to optimize startup performance, fault handling, and system reliability without increasing component count.

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Programmable Fault Management

The RS31317 allows designers to tailor fault recovery to match system availability requirements.

Configurable options include:

• Latch-off operation
• Automatic retry
• Programmable retry delay
• Programmable retry count
• Infinite retry
• Fixed retry before latch-off

Whether designing a mission-critical communications platform or an industrial control system, the RS31317 provides the flexibility needed to balance uptime with equipment protection.

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Intelligent Startup Verification

The integrated LDSTRT (Load Detect/Handshake) function verifies that downstream circuitry successfully powers up before normal operation begins.

This intelligent startup verification improves system reliability by identifying failed loads or abnormal startup conditions before they can affect the rest of the system.

Typical applications include:

• FPGA power rails
• Processor subsystems
• Communications modules
• Industrial controllers
• Intelligent peripheral cards

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High-Efficiency 15A Power Delivery

The integrated 2.0mΩ MOSFET minimizes voltage drop and conduction losses while supporting continuous currents up to 15A.

Benefits include:

• Higher efficiency
• Lower thermal dissipation
• Reduced PCB area
• Lower component count
• Simplified system design

This highly integrated architecture enables compact, reliable power distribution for modern electronic systems.

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Part of Reed Semiconductor’s Intelligent eFuse Family

The RS31317 belongs to Reed Semiconductor’s family of configurable intelligent eFuses, allowing designers to choose the overvoltage strategy that best matches their system architecture.

Each device is also available as either an Active Current Limiter (A) or Circuit Breaker (B) version, providing additional flexibility when selecting the desired fault response.

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Why Choose the RS31317?

The RS31317 combines 15A current capability, intelligent hot-swap control, programmable fault recovery, and precision current monitoring into a compact, highly integrated solution for 4.5V to 16V power rails. By omitting a fixed overvoltage shutdown threshold, it gives designers the freedom to implement custom system-level protection while still benefiting from advanced current limiting, startup sequencing, and comprehensive fault management. The result is a flexible, high-performance eFuse ideally suited for servers, networking equipment, communications infrastructure, and industrial control systems.

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