Eight-phase digital step-down multiphase controller with SVI3 and PMBus for AMD platform

The TPS53685 is a fully AMD

SVI3 compliant step-down controller with trans-inductor

voltage regulator (TLVR) topology support, dual channels,

built-in non-volatile memory (NVM), PMBus™ interface, and

full compatible with TI NexFET™ smart power

stages. Advanced control features such as D-CAP+™ architecture

with undershoot reduction (USR) provide fast transient

response and good current sharing, minimizing output

capacitance requirements. The device also provides a novel

phase interleaving strategy and dynamic phase shedding for

efficiency improvements at different loads. Adjustable

control of VCORE slew rate and voltage

positioning work with the AMD SVI3 features. In addition,

the device supports the PMBus communication interface for

reporting the telemetry of voltage, current, power,

temperature, and fault conditions to the systems. All

programmable parameters can be configured by the PMBus

interface and can be stored in NVM as the new default values

to minimize the external component count.

The TPS53685 device is

offered in a thermally enhanced 40-pin QFN packaged and is rated to operate

from –40°C to 125°C.