RS31380 - 4.5V to 16V, 50A Fully Integrated Smart eFuse With PMBus
Features
Power Path & Performance
- The RS31380 supports a wide input voltage range: 4.5V to 16V
- 50A continuous output current
- Integrated 0.8mΩ power MOSFET
- Programmable soft-start and inrush current control
Protection & Control
- Programmable overcurrent and short-circuit protection
- Input OVP, SCP, OCP, OTP
- Configurable fault response: no action, latch, or auto-retry
Scalability
- Standalone or parallel operation with the RS31386
- Smart eFuse controller architecture
Monitoring & Telemetry
- PMBus™/I2C 1.3 compliant
- +/-1.5% reporting accuracy for VIN, VOUT, IOUT, PIN, POUT and temperature
- Integrated current sensing output
System Integration
- Standalone operation or parallel operation with (RS31386)
- Programmable TON_DELAY and TOFF_DELAY
- Fault signal output (GOK) and fault indicator (FLT_TYPE) outputs
Package
-
- LGA-45, 5x7mm
- RoHS Compliant
Description
RS31380 4.5V to 16V, 50A Intelligent Hot-Swap eFuse with PMBus Telemetry
Modern AI servers, accelerator cards, networking equipment, and enterprise storage systems demand more than basic circuit protection. Designers need intelligent power management solutions that provide high-current hot-swap capability, comprehensive telemetry, programmable fault management, and seamless scalability—all while minimizing board space and component count.
The RS31380 is a fully integrated 50A intelligent hot-swap eFuse that combines a low 0.8mΩ power MOSFET, PMBus® 1.3 digital interface, precision telemetry, and advanced programmable protection into a compact 5 × 7 mm LGA-45 package. Operating from 4.5V to 16V, it provides a complete front-end power management solution for high-current 12V distributed power systems. The device supports standalone operation or can be paired with the RS31386 companion device to scale current capability for even higher-power applications.
Optimized for AI Servers and High-Performance Computing
The RS31380 is designed to protect high-current power rails feeding today’s most demanding computing platforms.
Typical applications include:
- AI accelerator cards
- GPU servers
- High-performance computing (HPC)
- Enterprise storage systems
- PCIe expansion cards
- Networking switches and routers
- Telecommunications infrastructure
- Server auxiliary power supplies
- Industrial computing platforms
Its combination of integrated hot-swap protection, digital telemetry, and intelligent fault management simplifies power delivery in systems where uptime and reliability are critical.
Fully Integrated 50A Hot-Swap Solution
Unlike traditional hot-swap controllers that require large external MOSFETs, the RS31380 integrates a 0.8mΩ power MOSFET capable of supporting 50A continuous load current.
Integration provides:
- Smaller PCB footprint
- Simplified layout
- Lower BOM cost
- Reduced parasitics
- Improved thermal performance
- Faster time to market
The integrated insertion delay and programmable soft-start allow controlled startup while minimizing inrush current during hot-plug events.
Complete PMBus Digital Telemetry
The RS31380 provides extensive real-time system monitoring through its PMBus®/I²C 1.3-compliant interface.
Available telemetry includes:
- Input voltage (VIN)
- Output voltage (VOUT)
- Output current (IOUT)
- Input current
- Input power (PIN)
- Output power (POUT)
- Input energy (EIN)
- Junction temperature
- IMON analog current output
This comprehensive visibility enables intelligent system monitoring, predictive maintenance, power optimization, and remote diagnostics for data center and industrial applications.
Intelligent Programmable Protection
The RS31380 offers extensive digital configurability to optimize protection for a wide range of applications.
Programmable features include:
- Overcurrent protection (OCP)
- Short-circuit protection (SCP)
- Input overvoltage protection (OVP)
- Overtemperature protection (OTP)
- Current limit threshold
- Short-circuit threshold
- Soft-start time
- Insertion delay
- TON-DELAY and TOFF-DELAY
- Fault response selection
Designers can configure each protection mechanism for no action, latch-off, auto-retry, or hiccup operation, allowing the protection strategy to be tailored to specific system requirements.
Scalable Architecture for Higher Power Systems
The RS31380 supports both standalone operation and scalable high-current designs.
For applications exceeding 50A, the device can operate as the intelligent master controller while the RS31386 companion device adds additional current capability through parallel operation. This architecture enables designers to increase output current while maintaining a single PMBus interface, centralized telemetry, and coordinated fault management.
This scalable approach is ideal for next-generation AI accelerators, GPU platforms, and high-density server power architectures where current requirements continue to increase.
Designed for Modern Data Center Power Systems
The RS31380 is engineered specifically for demanding power architectures that require:
- Hot-swap capability
- High-current protection
- Digital configuration
- Remote diagnostics
- Real-time telemetry
- High efficiency
- Intelligent fault management
Its integrated MOSFET and rich PMBus feature set significantly reduce external components while simplifying firmware development and system qualification.
Why Choose the RS31380?
The RS31380 combines a 50A integrated hot-swap controller, 0.8mΩ power MOSFET, PMBus® digital telemetry, and comprehensive programmable protection into a compact, highly integrated solution for modern high-current power systems. With extensive telemetry, configurable fault responses, precision current monitoring, and the ability to scale current using the RS31386 companion device, the RS31380 is an ideal front-end power management solution for AI servers, GPU accelerators, networking equipment, enterprise storage, and industrial computing platforms.
