TPS53681

ACTIVE

Dual-Channel 6+2/5+3 D-CAP+TM Multiphase Step-Down Controller with PMBus and NVM

Product details

Vin (min) (V) 4.5 Vin (max) (V) 17 Iout (max) (A) 300 Operating temperature range (°C) -40 to 125 Control mode D-CAP+ Topology Multiphase Rating Catalog Vout (min) (V) 0.25 Vout (max) (V) 2.8125 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 Iq (typ) (µA) 13000 Duty cycle (max) (%) 50 Number of phases 8
Vin (min) (V) 4.5 Vin (max) (V) 17 Iout (max) (A) 300 Operating temperature range (°C) -40 to 125 Control mode D-CAP+ Topology Multiphase Rating Catalog Vout (min) (V) 0.25 Vout (max) (V) 2.8125 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 Iq (typ) (µA) 13000 Duty cycle (max) (%) 50 Number of phases 8
WQFN (RSB) 40 25 mm² 5 x 5
  • 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
  • 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

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.

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

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Type Title Date
* Data sheet TPS53681 Dual-Channel (6-Phase + 2-Phase) or (5-Phase + 3-Phase) D-CAP+™ Step-Down Multiphase Controller with NVM and PMBus™ datasheet (Rev. B) PDF | HTML 09 Jan 2019
White paper Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) PDF | HTML 30 Apr 2024
Application note Multiphase Buck Design from Start to Finish, Part 1 (Rev. B) 07 Apr 2021
Application note Selection Considerations for Output Capacitors of Multiphase Volt. Reg. Part 1 PDF | HTML 01 Apr 2020
Technical article Minimize the impact of the MLCC shortage using D-CAP+™ control mode PDF | HTML 05 Apr 2019
Application note D-CAP+TM Control for Multiphase Step-Down Voltage Regulators for Powering Microp 13 Jan 2019
Technical article How to use PMBus power solutions for NXP QorIQ processors PDF | HTML 09 May 2018
Application note NVM Programming for VR13 Power Controllers PDF | HTML 04 May 2018
Selection guide DC/DC Buck Controller Solutions Selection Guide 06 Feb 2018
EVM User's guide Using the TPS53681EVM 18 Dec 2017
Technical article The D-CAP+™ Modulator: Evaluating the small-signal robustness PDF | HTML 15 Nov 2017
Technical article Powering high-current Broadcom networking processors in Ethernet switches PDF | HTML 06 Sep 2017
User guide TPS53681 Technical Reference Manual 25 Apr 2017
User guide Using the Fusion Digital Power Designer for TPS536xx VR13 Multiphase Solutions 16 Dec 2016

Design & development

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

Evaluation board

TPS53681EVM-002 — Dual-channel (6+2/5+3) evaluation module for D-CAP+™ step-down controller with PMBus interface

The TPS53681EVM evaluation module allows users to assess the operating characteristics of the TPS53681 controller with the CSD95490 smart power stages in a low voltage, high current, step-down point of load (POL) application with the configuration, control and monitoring functionality of the (...)

User guide: PDF
Not available on TI.com
Application software & framework

FUSION_DIGITAL_POWER_DESIGNER — Digital Power Software

Fusion Digital Power™ graphical user interface (GUI) software is 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.
Application software & framework

FUSION_MFR_GUI — Fusion Digital Power Manufacturing Tool

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 (...)

Reference designs

PMP22165 — Power for Xilinx Versal adaptive compute acceleration platform (ACAP) reference design

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 (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDA-050020 — PMBus™ voltage regulator reference design for Xilinx® Virtex Ultrascale+™ FPGAs

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 (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-01512 — PMBus Voltage Regulator Reference Design for NXP QorIQ LS2085A/88A Processors

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, (...)

Design guide: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
WQFN (RSB) 40 Ultra Librarian

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