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Product details

Parameters

Vin (Min) (V) 4.5 Vin (Max) (V) 17 Vout (Min) (V) 0.25 Vout (Max) (V) 2.8125 Iout (Max) (A) 300 Iq (Typ) (mA) 13 Switching frequency (Min) (kHz) 300 Switching frequency (Max) (kHz) 1000 Features Adjustable Current Limit, Dynamic Voltage Scaling, Enable, Light Load Efficiency, Multiple Outputs, PMBus, Phase Interleaving, Power Good, Pre-Bias Start-Up, Remote Sense, Synchronous Rectification, UVLO Adjustable, Voltage Margining Operating temperature range (C) -40 to 125 Regulated outputs (#) 2 Number of Phases 8 Rating Catalog open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

WQFN (RSB) 40 25 mm² 5 x 5 open-in-new Find other Buck controllers (external switch)

Features

  • Conversion Input Voltage Range: 4.5 V to 17 V
  • 8-Bit DAC with Selectable 5 mV or 10 mV Resolution and Output Ranges from 0.25 V to 1.52 V or 0.5 to 2.8125 V for Dual Channels
  • Phase Configurations
    • Maximum (6-Phase + 2-Phase) or (5-Phase + 3-Phase)
    • Minimum (1-Phase + 1-Phase)
  • Driverless Configuration for Efficient High-Frequency Switching
  • Dynamic Output Voltage Transitions with Programmable Slew Rates via PMBus Interface
  • Frequency Selections with Closed-loop Frequency Control: 300 kHz to 1 MHz
  • Programmable Internal Loop Compensations
  • Configurable with Non-Volatile Memory (NVM) for Low External Component Counts
  • 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)
  • Fully Compatible with TI NexFET™ Power Stage for High-Density Solutions
  • Accurate, Adjustable Voltage Positioning
  • Patented AutoBalance™ Phase Balancing
  • Selectable, 16-level Per-Phase Current Limit
  • PMBus™ System Interface for Telemetry of Voltage, Current, Power, Temperature, and Fault Conditions
  • Low Quiescent Current
  • 5 mm × 5 mm, 40-Pin, QFN PowerPad™ Package

All trademarks are the property of their respective owners.

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Description

The TPS53681 is a multiphase step-down controller with dual channels, built-in non-volatile memory (NVM), and PMBus™ interface, and is fully compatible with TI NexFET ™power stage. Advanced control features such as D-CAP+™ architecture with undershoot reduction (USR) provide fast transient response, low output capacitance, and high efficiency. The device also provides novel phase interleaving strategy and dynamic phase shedding for efficiency improvement at different loads. The device supports fast dynamic voltage transitions with adjustable slew rate. 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 TPS53681 device is offered in a thermally enhanced 40-pin QFN packaged and is rated to operate from –40°C to 125°C.

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Technical documentation

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
249
Description
The TPS53681EVM evaluation module (EVM) allows users to evaluate The TPS53681 controller. The Controller is dual channel(6+2 or 5+3 phases), D-CAP+ synchronous buck driverless control with PMBus Interface. The device operates using a voltage supply between 4.5 V and 17 V. The controller allows (...)
Features
  • Configurable to 6+2 or 5+3 phases
  • Test support for high power(300A) ASIC
  • Support for dynamic load
INTERFACE ADAPTERS Download
99
Description

This EVM serves as an interface adapter or a bridge between a host PC (IBM™ compatible) and one or multiple slave devices via a standard type-A to mini-B USB cable. The communication between the USB interface adapter and the host PC is via USB, while the communication between the USB interface (...)

Features
  • Supports master mode I²C, SMBus or PMBus as well as GPIO.
  • Supports USB1.1 full speed at 12 Mbit/s. The USB interface adapter is recognized by the host as a generic human interface device (HID), so no proprietary USB or HID driver is needed. Therefore, the USB interface adapter can be treated as a (...)

Software development

APPLICATION SOFTWARE & FRAMEWORKS Download
Digital Power Software
FUSION_DIGITAL_POWER_DESIGNER Fusion Digital Power™  is the Graphical User Interface (GUI) used to configure and monitor select Texas Instruments digital power controllers and sequencer/health monitors. The application uses the PMBus protocol to communicate with the device over serial bus by way of a TI USB adapter.
Features

Some of the tasks you can perform with the GUI include:

  • Turn on or off the power supply output, either through the hardware control line or the PMBus OPERATION command
  • Monitor real-time data. Items such as input voltage, output voltage, output current, temperature, and warnings/faults are continuously (...)
APPLICATION SOFTWARE & FRAMEWORKS Download
Fusion Digital Power Manufacturing Tool
FUSION_MFR_GUI The Fusion Digital Power Manufacturing Tool (aka MFR GUI) is a Graphical User Interface used to download firmware, upgrade firmware, configure, calibrate and test .

The MFR GUI supports the same devices as Fusion Digital Power Designer software.  This tool is typically used in manufacturing (...)

Features

Some of the tasks the tool can perform include:

  • Download/Upgrade firmware
  • Program a device configuration
  • Calibrate a device (manually or instrumented via GPIB):
    • Input voltage (Vin)
    • Output voltage (Vout)
    • Output current (Iout)
    • Temperature
  • Test the device (validate power conversion falls within acceptable Vout (...)

Design tools & simulation

SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

REFERENCE DESIGNS Download
Power for Xilinx versal adaptive compute acceleration platform (ACAP) reference design
PMP22165 — This reference design addresses Xilinx versal adaptive compute acceleration platform (ACAP) requirements and consists of a power management integrated circuit (PMIC) for system-rails, plus a multiphase controller and power stages to support higher current processor loads.  On-board dynamic (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
PMBus™ voltage regulator reference design for Xilinx® Virtex Ultrascale+™ FPGAs
TIDA-050020 This reference design uses the TPS53681 multiphase controller and CSD95490Q5MC smart power stages to implement a high-performance design suitable for powering the 0.85-V, 200-A, VCCINT rail of a Xilinx™ Ultrascale+™ FPGA. The secondary output of the controller can then be used to power (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
PMBus Voltage Regulator Reference Design for NXP QorIQ LS2085A/88A Processors
TIDA-01512 TIDA-01512 uses the TPS53681 multiphase controller and CSD95490Q5MC Smart Power Stages to implement a high-performance design suitable for powering NXP QorIQ Communications Processors.

The dual outputs of the controller target the 60-ATDC, 1.0-V core rail with a four-phase design and a 30-ATDC, 1.2-V (...)

document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
WQFN (RSB) 40 View options

Ordering & quality

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