General Description
The MAX20816 IC provides a high-density, flexible and
scalable dual-loop solution for high-current cores for AI
applications. This dual-loop solution supports up to 16
phases in total, configurable from 16+0 to 8+8 phases
between Rail A and Rail B. Coupled inductors and smart
power-stage ICs are used to implement dual highefficiency
regulators with enhanced transient response.
The complete circuit is a highly efficient (N+M) = 16
multiphase synchronous buck converters with extensive
status and parameter-measurement features. A single,
scalable PCB design with appropriate smart powerstage
IC selection can be used to produce two power
supplies with a wide range of current ratings. PWM
paralleling allows up to 48 phases for very high current
applications.
The IC’s simplified architecture reduces component
count, enables advanced power management and
telemetry, and increases energy savings over the full
load range.
Regulator parameters for protection and shutdown can
be set and monitored through the PMBus™ interface.
Power-stage faults, input and output voltage, input and
output current, input power, and the temperature of the
smart power-stage IC are readable over the serial
interface. The critical fault retention feature prevents
exothermic events after a power-device fault. Preset and
user configurations are programmed in nonvolatile
memory (NVM). MTP-programmable NVM circuits allow
for field modifications. An integrated 3.3V to 1.8V linear
regulator provides the controller bias supply.
The MAX20816 is available in a 56-pin, 7mm x 7mm
TQFN package.
Applications
• NVIDIA GPUs with PWMVID Interface
• AVSBus™ for Fast Dynamic Voltage Transitions
• AI Cores, XPUs, GPUs, Networking ASICs
• High-Current Multiphase Voltage Regulators
• 32ph (2 Parallel) or 48ph (3 Parallel)
Configuration
• Up to 2500A
Benefits and Features
• High Power Density and Efficiency
• Smart Power-Stage Support
• Top-Tier Efficiency (90.71% Peak Efficiency at
0.75VOUT)
• Integrated Output Power Monitor
• 16-ph N+M Dual-Loop Multiphase Architecture
• High-Speed Digital Interface
• PWMVID and AVSBus Support
• Telemetry through PMBus
• Digitally Programmable Configuration
• Input Voltage, Current, and Power Monitoring
• Power-Stage Temperature Monitoring and
Reporting
• Fault, Command, and Data Logging (Black Box
Feature)
• Digital GPIO (OCP, OTW, VR Settled Indicators)
• Advanced Power Management
• Orthogonal Current Rebalance for Phase-Current
Balance During Transients
• Programmable Phase Firing Order
• Protection Features
• Input and Bias Supply Undervoltage Protection
• Overcurrent Protection
• Password Protection