1 Features

? Input voltage range: 4.5 V to 17 V

? Output voltage range: 0.25 V to 5.5 V

? Dual output supporting N+M ≤ 8 phases, M ≤ 4

phases

? Native trans-inductor voltage regulator (TLVR)

topology support

? AMD? SVI3 compliant

? Enhanced D-CAP+? control to provide superior

transient performance with excellent dynamic

current sharing

? Programmable loop compensations

? Flexible phase-firing sequencing

? Individual phase current calibrations and reports

? Dynamic phase shedding with programmable

current threshold for optimizing efficiency at light

and heavy loads

? Fast phase-adding for undershoot reduction

? Driverless configuration for efficient high-frequency

switching

? Fully compatible with TI NexFET? power stages

for high-density solutions

? Accurate, adjustable voltage positioning

? Patented AutoBalance? phase current balancing

? Selectable per-phase current limit

? PMBus? system interface for telemetry of voltage,

current, power, temperature, and fault conditions

? 5.00 × 5.00 mm, 40-pin, 0.4 mm pitch, QFN

package

2 Applications

? Rack server

? Microserver and tower server

? High performance computing

? Baseband unit (BBU)

3 Description

The TPS53685 is a fully AMD SVI3 compliant stepdown

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.