1 Features

• Input voltage range: 4.5V to 18V

• Output voltage range: 0.25V to 5.5V

• Intel® VR13.HC SVID compliant

• Dual output supporting M+N phase configurations:

(N+M ≤ 8, M ≤ 4)

• Enhanced D-CAP+™ control to provide super

transient performance with excellent dynamic

current sharing

• Programmable loop compensations

• Programmable phase-firing order

• 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 (USR)

• Driverless configuration for efficient high-frequency

switching

• Fully compatible with TI NextFET™ power stage for

high-density solutions

• Accurate, adjustable voltage positioning (AVP)

• Patented AutoBalance™ phase balancing

• Cycle-by-cycle per-phase current limit

• PMBus™ system interface for telemetry of voltage,

current, power, temperature, and fault conditions

• New soft-shutdown option for over voltage fault

• 5mm × 5mm, 40-pin, QFN package

2 Applications

• Data center & enterprise computing rack server

• Hardware accelerator

• Network interface card (NIC)

• ASIC and high performance client

3 Description

The TPS53688A is a fully VR13.HC SVID compliant

step-down controller with dual channels, built-in nonvolatile

memory (NVM), and PMBus interface, and

is fully compatible with TI NexFET smart power

stage. Advanced control features such as DCAP+

architecture with undershoot reduction (USR) provide

fast transient response, low output capacitance, and

good current sharing. The device also provides

novel phase interleaving strategy and dynamic phase

shedding for efficiency improvement at different

loads. Adjustable control of VCORE slew rate and

voltage positioning round out the VR13.HC SVID

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 TPS53688A device if offered in a thermally

enhanced 40-pin QFN packaged and is rated to

operate from –40°C to 125°C.