1 Features

1• 8-bit Selectable BOOT Voltage via Pinstrap or

NVM: 0.5 V to 2.5 V (down to 5-mV Step)

• 1-, 2-, 3-, or 4- Phase Operation

• PMBus™ System Interface for Telemetry of

Voltage, Current, Power, Temperature, and Fault

Conditions

• 1.8-V and 3.3-V PMBus Bias Compatible

• Fault Reporting: Output Voltage, Output Current,

and Temperature

• Configurable with Non-Volatile Memory (NVM) or

Resistor Pinstrap

• 16 Levels of Programmable OCP with Pinstrap or

NVM

• Fast Transient with DCAP+™Control

• Optimized Efficiency at Light and Heavy Loads

• Support Pre-Bias Startup

• Phase Current Imbalance Detection and

Reporting

• 8 Independent Levels of Overshoot Reduction

(OSR) and Undershoot Reduction (USR)

• Driverless Configuration for Efficient High-

Frequency Switching

• Fully Compatible with CSD95372BQ5MC

NexFET™ Power Stage

• Accurate, Adjustable Voltage Positioning

• 300-kHz to 1-MHz Frequency Selections with

Closed-loop Frequency Control

• Patented AutoBalance™ Phase Balancing

• Uses TI’s Fusion Digital Power Designer GUI

• Dynamic Phase Shedding with Programmable

Current Threshold

• Conversion Voltage Range: 4.5 V to 17 V

• Small, 6 mm × 6 mm, 40-Pin, QFN, PowerPAD™

Package

2 Applications

• Application-Specific Integrated Circuit (ASIC)

Power in Communications Equipment

• High Density Power Solutions

• Server Power

• Smart Power Systems

3 Description

The TPS53647 is a high-current, multi-phase, stepdown

controller. The device offers built-in non volatile

memory (NVM) and PMBus interface. It is compatible

with the NexFET power stages (CSD95372BQ5MC).

The TPS53647 provides 8-bit BOOT voltage selection

covering output voltage from 0.5 V to 2.5 V, with

steps as small as 5 mV, which is ideal for high

current application with accurate output voltage

setting. Advanced control features such as D-CAP+

architecture with undershoot reduction (USR) and

overshoot reduction (OSR) provide fast transient

response, lowest output capacitance, and high

efficiency. The TPS53647 also provides novel phase

interleaving strategy and dynamic phase shedding for

efficiency improvement at light loads. In addition, the

TPS53647 supports the PMBus communication

interface with systems for telemetry of voltage,

current, power, temperature, and fault conditions.

Some of the configurations can be programmed by

pinstrap or PMBus and stored in non-volatile memory

to minimize the external component count.

The TPS53647 is offered in a space saving, thermally

enhanced 40-pin QFN package and is rated to

operate from –40°C to 125°C.