RS86900

RS86900 90A Smart Power Stage for High-Performance Multiphase VRMs

The RS86900 is a high-efficiency 90A Smart Power Stage that integrates high-side and low-side MOSFETs, optimized gate drivers, current sensing, and temperature monitoring into a compact 4mm × 6mm TLGA package. Designed for high-current multiphase voltage regulators, the RS86900 delivers exceptional efficiency, fast transient response, and high power density for AI servers, cloud computing, enterprise storage, networking, telecommunications, and high-performance computing applications.

Supporting an operating input voltage range from 2.5V to 16V, the RS86900 operates at switching frequencies up to 3MHz, enabling designers to reduce passive component size while improving overall power density. The integrated architecture minimizes parasitic inductance, improves switching performance, and simplifies PCB layout compared to discrete MOSFET implementations.

Whether powering next-generation CPUs, GPUs, AI accelerators, FPGAs, or custom ASICs, the RS86900 provides the efficiency, reliability, and thermal performance required by today’s demanding computing platforms.

Optimized for Reed Semiconductor Multiphase PWM Controllers

The RS86900 is specifically designed to work with Reed Semiconductor’s family of digital and analog multiphase PWM controllers, providing a complete VRM solution for high-current processor power rails. Combining Reed controllers with the RS86900 enables designers to shorten development time while maximizing efficiency, load transient performance, current balancing, and thermal optimization.

Recommended controller families include:

• RS19G20 – 20-phase digital multiphase PWM controller with PMBus
• RS19C20 – High-performance digital PWM controller for AI and server platforms
• RS19820 – Digital VR controller supporting advanced telemetry
• RS18G30 – Advanced digital controller with PMBus communication
• RS17G22 – Multiphase controller optimized for server and telecom VRMs
• RS18C22 – Analog multiphase PWM controller
• RS16K20 – Cost-optimized controller for networking and industrial applications

Together, these controllers and Smart Power Stages provide a scalable platform supporting applications ranging from compact four-phase POL converters to high-current 20-phase processor VRMs.

High Efficiency and Fast Transient Performance

Modern AI processors and server CPUs demand extremely fast load transient response while maintaining tight output voltage regulation. The RS86900 is optimized for these requirements by integrating high-performance MOSFETs and gate drivers that reduce switching losses and minimize dead time.

Operating at switching frequencies up to 3MHz, the RS86900 allows smaller inductors and output capacitors, enabling more compact VRM designs without sacrificing efficiency. Integrated current sensing also provides accurate phase current information for balancing multiple phases, while temperature monitoring helps optimize thermal performance across the entire power stage.

The result is a highly efficient power solution capable of supporting today’s rapidly changing processor loads while reducing total system power loss.

Integrated Protection and System Reliability

Reliable operation is critical for enterprise and cloud computing systems. The RS86900 incorporates comprehensive protection features that help safeguard both the power stage and the load under fault conditions.

Integrated protection includes:

• VIN undervoltage lockout (UVLO)
• VDD undervoltage lockout (UVLO)
• High-side overcurrent protection
• Cycle-by-cycle current limiting
• Overtemperature protection (OTP)

These features help simplify system design while improving long-term reliability in high-availability applications such as AI servers, networking equipment, telecommunications infrastructure, and enterprise storage systems.

Ideal for AI, Server, and Networking Applications

The RS86900 is designed for applications requiring exceptional power density, efficiency, and reliability.

Typical applications include:

• AI accelerator cards
• GPU voltage regulator modules (VRMs)
• Server processor power supplies
• Cloud computing infrastructure
• Enterprise storage systems
• Networking switches and routers
• Telecommunications equipment
• FPGA and ASIC core power supplies
• High-current point-of-load (POL) converters

Its compact footprint and integrated architecture make it particularly well suited for space-constrained systems where maximizing current density and minimizing thermal challenges are critical design objectives.

Simplify High-Current Power Supply Design

By integrating high-side and low-side MOSFETs, gate drivers, current sensing, and temperature monitoring into a single compact package, the RS86900 significantly reduces component count and PCB complexity compared to discrete implementations. Designers benefit from simplified layout, improved electrical performance, lower switching losses, and enhanced thermal characteristics while reducing overall development time.

When paired with Reed Semiconductor’s multiphase PWM controllers, the RS86900 forms a complete power delivery solution capable of meeting the demanding requirements of next-generation AI processors, high-performance CPUs, GPUs, FPGAs, and custom accelerators. Together, these devices provide the scalability, efficiency, and reliability needed for tomorrow’s high-performance computing platforms.