The MAX20855A IC provides a high-density, flexible,
and scalable dual-loop solution to power AI cores, XPUs,
GPUs, or Intel® VR14 or VR13 server CPUs. The
controller IC is a dual-loop controller with an integrated
PSYS device. The dual-loop solution supports up to 8
phases in total, configurable from 8+0 to 4+4 phases
between Rail A and Rail B. Coupled inductors and smart
power-stage ICs are used to implement dual high-efficiency regulators with enhanced transient response
and low-quiescent current. Both rails and the PSYS
device are compliant with VR14 specifications. The
complete circuit is a highly efficient (N+M) = 8
multiphase synchronous buck converters with extensive
status and parameter-measurement features. PWM
paralleling allows up to 16 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. Autonomous phase shedding maintains high
efficiency across the entire 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. 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 MAX20855A is available in a 40-pin, 5mm x 5mm FCLGA package.
Applications
- High-Current Multiphase Voltage Regulators
- VR13, VR14 CPUs
- AI Cores, XPUs, GPUs, Networking ASICs
- Servers, Workstations, Enterprise Storage
- Communications and Networking Equipment Supply
