RS18C22 - VR14, VR13.HC, VR13 & PMBus
Features
Native TLVR & High-Performance Control
- The RS18C22 is a Native Trans-Inductor Voltage Regulator (TLVR) support
- No external passive components required
- Up to 4 MHz switching frequency
- Constant On-Time (COT) control for fast transient response
- Built-in 1 kΩ current-sense resistor
- Internal compensation
Flexible Multiphase Architecture
- Dual-rail controller supporting up to 12 total phases (12+0 to 8+4)
- Flexible phase assignment
- Automatic phase add/drop for improved light-load efficiency
- Thermal balance management
Optimized for Reed Semiconductor Power Solutions
- Designed for Reed Semiconductor Smart Power Stages
- Compatible with Reed Smart Power Blocks and Integrated Power Modules
- High-density, high-efficiency VRM solutions
Precision Regulation & Telemetry
- 4.5 V to 16 V input voltage
- 0.2 V to 2.8 V output voltage
- Differential remote voltage sensing
- ±0.5% output voltage accuracy
- ±1.5% input/output voltage telemetry
- ±1.5% output current telemetry
- ±2°C temperature telemetry
Advanced Digital Control
- Intel® VR14, VR13.HC and VR13 compliant
- PMBus™ v1.3.1 interface
- Built-in Multiple-Time Programmability (MTP)
- Up to 32 field reprogramming cycles
- Black-box fault recording
- Programmable DC load-line compensation
- Programmable overshoot and undershoot reduction
Comprehensive Protection
- Programmable latch-off or auto-retry fault response
- UVLO, UVP, OVP, OCP and OTP
- Cycle-by-cycle per-phase current limiting
High-Efficiency System Optimization
- Automatic phase management for improved efficiency
- Reduced output capacitance with TLVR architecture
- Lower external component count
- Optimized PCB area and BOM cost
- Improved thermal performance
Package & Compliance
- Compact 6 mm × 6 mm, 48-pin QFN package
- RoHS compliant
Description
High-Performance 12-Phase Digital Multiphase Controller
The RS18C22 is a dual-rail digital multiphase buck controller supporting up to 12 total phases (12+0 to 8+4) for Intel® server processors, AI accelerators, networking equipment, telecommunications infrastructure, and high-current FPGA applications. Native Trans-Inductor Voltage Regulator (TLVR) support, Intel® SVID compatibility, PMBus™ v1.3.1, and Multiple-Time Programmability (MTP) provide exceptional transient response, precise voltage regulation, and comprehensive telemetry for today’s high-performance computing platforms.
Designed to integrate seamlessly with Reed Semiconductor Smart Power Stages, Smart Power Blocks, and Integrated Power Modules, the RS18C22 enables compact, high-density voltage regulator solutions with improved efficiency, reduced PCB area, and lower overall system cost. Advanced digital control features—including programmable DC load-line compensation, automatic phase add/drop, programmable overshoot and undershoot reduction, and intelligent thermal balancing—allow designers to optimize performance across a wide range of processor workloads.
Native TLVR Architecture
Native TLVR Support
The RS18C22 features native Trans-Inductor Voltage Regulator (TLVR) support without requiring additional external passive components. TLVR technology significantly improves load transient response while reducing output capacitance requirements for modern CPUs, GPUs, and AI processors.
Fast Dynamic Voltage Regulation
Advanced Constant-On-Time (COT) control, programmable slew rates, and digital compensation enable rapid response to large load current transients while minimizing voltage overshoot and undershoot.
Flexible Multiphase Architecture
Up to 12 Total Phases
Supporting flexible dual-rail configurations from 12+0 to 8+4, the RS18C22 allows designers to optimize power delivery for high-current single-rail processors or multiple processor rails.
Intelligent Phase Management
Automatic phase add/drop improves efficiency during light-load operation while maintaining outstanding transient performance under dynamic processor loads.
Flexible Phase Assignment
Configurable phase ordering simplifies PCB routing and helps optimize layouts for compact, high-density voltage regulator modules.
Optimized for Reed Semiconductor Power Solutions
Smart Power Stages
The RS18C22 is optimized for use with Reed Semiconductor Smart Power Stages, delivering highly efficient processor voltage regulators with exceptional thermal performance and industry-leading power density.
Smart Power Blocks
Pairing the RS18C22 with Reed Smart Power Blocks enables highly integrated multiphase power solutions that reduce component count, simplify layout, and improve overall switching efficiency.
Integrated Power Modules
The RS18C22 also complements Reed Semiconductor’s family of Integrated Power Modules, allowing designers to build scalable power architectures using a common PMBus management interface.
Precision Digital Control & Telemetry
Intel® SVID and PMBus Interface
Native support for Intel® VR14, VR13.HC, and VR13 specifications together with PMBus™ v1.4.1 enables complete digital configuration, monitoring, and system management for enterprise computing platforms.
High-Accuracy Telemetry
Integrated telemetry provides precise monitoring of critical system parameters, including:
- ±1.5% input voltage accuracy
- ±1.5% output voltage accuracy
- ±1.5% output current accuracy
- ±2°C temperature accuracy
Multiple-Time Programmability
Built-in Multiple-Time Programmability (MTP) supports up to 32 rewrites, allowing production calibration, firmware updates, and field optimization throughout the product lifecycle.
Advanced Voltage Regulation
Programmable Load-Line Compensation
Programmable DC load-line compensation enables designers to optimize processor voltage regulation while minimizing external output capacitance.
Optimized Transient Performance
Programmable overshoot and undershoot reduction thresholds improve voltage regulation during rapidly changing processor workloads commonly found in AI servers and enterprise computing systems.
Internal Compensation
Integrated compensation reduces external component count while simplifying loop stability design and accelerating system development.
Comprehensive Protection Features
The RS18C22 integrates a complete suite of programmable protection functions to maximize system reliability.
Protection Functions
- Programmable latch-off or auto-retry fault response
- Input undervoltage lockout (UVLO)
- Output undervoltage protection (UVP)
- Output overvoltage protection (OVP)
- Overcurrent protection (OCP)
- Overtemperature protection (OTP)
- Cycle-by-cycle per-phase current limiting
Integrated fault logging simplifies validation, troubleshooting, and field diagnostics.
High Efficiency & Reduced System Cost
The RS18C22 combines advanced digital control with intelligent power management to improve efficiency while reducing overall system complexity.
Benefits include:
- Native TLVR architecture with fewer external passive components
- Reduced output capacitance
- Smaller PCB footprint
- Automatic phase management for higher efficiency
- Lower BOM cost
- Simplified PCB layout
- Optimized thermal performance
These capabilities make the RS18C22 an excellent choice for high-performance servers, AI accelerators, networking equipment, telecommunications infrastructure, and other high-current digital power applications.
Related Reed Semiconductor Products
The RS18C22 is designed to operate seamlessly with other Reed Semiconductor digital power solutions.
Smart Power Stages
- RS86610 (2.5 to 16VIN, 60A . ≤2MHz 4 x 5mm TLGA-25)
- RS86810 (2.5 to 16VIN, 90A, ≤2MHz 5 x 6mm TLGA-41)
- RS85A01 (2.5 to 7.5VIN, 100A, ≤3MHz 5 x 6 TLGA-41)
Smart Power Blocks
- RSM5G02 (2.5 to 7.5VIN, 2-Phase, 140A module 10 x 9 x 8mm LGA-72)
- RSM6G03 (2.5 to 16VIN, 2-Phase, 140A module 10 x 9 x 4mm LGA-72)
- RSM5G05 ( 2.5 to 7,5VIN, 2-Phase 140A module 10 x 9 x 5 mm LGA-72)
Intermediate Bus Converters
Digital Multiphase Controllers
- RS17G22 (PWMVID/AVSBus, up to 16 phases)
- RS18G20 (VR.13/VR14, PMBus up to 16 phases)
- RS19G20 (SVI3 up to 16 phases)
