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TPS40425

ACTIVE

Dual Output, 2-Phase, Stackable PMBUS Synchronous Buck Driverless Controller

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Data sheet

TPS40425

ACTIVE
Data sheet Order now

Product details

Vin (min) (V) 4.5 Vin (max) (V) 20 Vout (min) (V) 0.6 Vout (max) (V) 5 Iout (max) (A) 40 Iq (typ) (mA) 18 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 1500 Features Adjustable current limit, Dynamic Voltage Scaling, Enable, Frequency synchronization, 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 2 Rating Catalog Control mode Voltage mode Type Controller
Vin (min) (V) 4.5 Vin (max) (V) 20 Vout (min) (V) 0.6 Vout (max) (V) 5 Iout (max) (A) 40 Iq (typ) (mA) 18 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 1500 Features Adjustable current limit, Dynamic Voltage Scaling, Enable, Frequency synchronization, 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 2 Rating Catalog Control mode Voltage mode Type Controller
VQFN (RHA) 40 36 mm² 6 x 6
  • Non-Smart Power Mode in Factory Default
  • Pin-for-Pin Equivalent to TPS40428 – Smart Power Mode in Factory Default
  • Single Supply Operation: 4.5 V to 20 V
  • VOUT from 0.6 V
  • Dual or Multi-Phase Synchronous Buck Controller
  • Individual High-Speed AVS Interface
    (0.5-V to 1.5-V Range)
  • Fast Transient Response
  • Stackable up to Four Phases
    • 2-, 3-, or 4-Phase Interleaved Phase Shifts
    • Accurate Current Sharing
  • PMBus™ Interface Capability
    • Margining Up or Down with 2-mV Step
    • Programmable Fault Limit and Response
    • ±0.8% VOUT
    • Accuracy Current Monitoring
    • ±4.5°C External Temperature Monitoring with x3904
    • Programmable UVLO ON/OFF Thresholds
    • Programmable Soft-Start Time, Turn-On Delay, and Turn-Off Delay
  • On-Chip Non-Volatile Memory (NVM) to Store Custom Configurations
  • 0.6-V Reference Voltage with 0.5% Accuracy from –40°C to 125°C
  • Inductor DCR Current Sensing
  • Programmable ƒSW from 200 kHz to 1.5 MHz
  • Supports Pre-biased Output
  • Differential Remote Sensing
  • Synchronization to an Extermal Clock
  • OC/OV/UV/OT Fault Protection
  • 40-Pin, 6 mm × 6 mm, QFN Package
  • Support for TI Power Stage
  • Non-Smart Power Mode in Factory Default
  • Pin-for-Pin Equivalent to TPS40428 – Smart Power Mode in Factory Default
  • Single Supply Operation: 4.5 V to 20 V
  • VOUT from 0.6 V
  • Dual or Multi-Phase Synchronous Buck Controller
  • Individual High-Speed AVS Interface
    (0.5-V to 1.5-V Range)
  • Fast Transient Response
  • Stackable up to Four Phases
    • 2-, 3-, or 4-Phase Interleaved Phase Shifts
    • Accurate Current Sharing
  • PMBus™ Interface Capability
    • Margining Up or Down with 2-mV Step
    • Programmable Fault Limit and Response
    • ±0.8% VOUT
    • Accuracy Current Monitoring
    • ±4.5°C External Temperature Monitoring with x3904
    • Programmable UVLO ON/OFF Thresholds
    • Programmable Soft-Start Time, Turn-On Delay, and Turn-Off Delay
  • On-Chip Non-Volatile Memory (NVM) to Store Custom Configurations
  • 0.6-V Reference Voltage with 0.5% Accuracy from –40°C to 125°C
  • Inductor DCR Current Sensing
  • Programmable ƒSW from 200 kHz to 1.5 MHz
  • Supports Pre-biased Output
  • Differential Remote Sensing
  • Synchronization to an Extermal Clock
  • OC/OV/UV/OT Fault Protection
  • 40-Pin, 6 mm × 6 mm, QFN Package
  • Support for TI Power Stage

The TPS40425 is a PMBus, synchronous buck, driverless controller. It operates in non-smart power mode in factory default setting, and it can operate in smart power mode after PMBus programming and power reboot. It can be configured as dual-output or 2-phase. It is also stackable up to 4 phases to support load current as high as 120 A. Interleaved phase shift for 2-, 3-, or 4-phases reduce the input and output ripples therefore reducing input and output capacitance.

The wide input voltage range can support 5-V and 12-V intermediate supply buses. The 0.5% reference voltage satisfies the need of precision voltage to the modern ASICs.

Using the PMBus standard, the TPS40425 device can program reference voltage, fault limit, UVLO threshold, soft-start time and turn-on and turn-off delay.

In addition, the device implements an accurate measurement system to monitor the output voltages, currents and temperatures for individual channels.

The TPS40425 is a PMBus, synchronous buck, driverless controller. It operates in non-smart power mode in factory default setting, and it can operate in smart power mode after PMBus programming and power reboot. It can be configured as dual-output or 2-phase. It is also stackable up to 4 phases to support load current as high as 120 A. Interleaved phase shift for 2-, 3-, or 4-phases reduce the input and output ripples therefore reducing input and output capacitance.

The wide input voltage range can support 5-V and 12-V intermediate supply buses. The 0.5% reference voltage satisfies the need of precision voltage to the modern ASICs.

Using the PMBus standard, the TPS40425 device can program reference voltage, fault limit, UVLO threshold, soft-start time and turn-on and turn-off delay.

In addition, the device implements an accurate measurement system to monitor the output voltages, currents and temperatures for individual channels.
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Technical documentation

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Type Title Date
* Data sheet TPS40425 Dual Output, 2-Phase, Stackable PMBus™ Synchronous Buck Driverless Controller with Adaptive Voltage Scaling (AVS) Bus datasheet (Rev. C) PDF | HTML 01 Oct 2018
Application note Multiphase Buck Design from Start to Finish, Part 1 (Rev. B) 07 Apr 2021
Application note SMT Guidelines for Stacked Inductor (Inductor On Top) on Voltage Regulator IC 22 Feb 2016
Technical article Select the correct PMBus POL solution for your application PDF | HTML 03 Aug 2015
EVM User's guide Using the PWR594 EVM Dual Output DC/DC Analog with PMBus Interface 30 Jul 2014

Design & development

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

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.
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Simulation model

TPS40425 PSpice Transient Model

SLUM430.ZIP (216 KB) - PSpice Model
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
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Reference designs

PMP20481 — High Efficiency, Compact Dual 10A Digital Point-of-Load Reference Design for 5V and 7V Applications

The PMP20481 reference design pairs digital TPS40425 controller with digital buck driver UCD7242 for a dual 10A point-of-load in a tiny 0.625"x1.075" solution size (15.9mmx27.3mm). UCD7242 fully integrates a dual 10A synchronous buck power driver into a small 6mmx6mm QFN package. The PMP20481 (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP11196 — Reference Design for 12Vin, Two Phase Synchronous Buck Converter 1V 50A with PMBus Control

Fixed frequency voltage mode control is used for CPU, Memory and ASIC applications where a predictable frequency and/or synchronization to an external clock is needed.  Two high current synchronous power stages provide the high currents and low losses needed for these applications. Multi-phase (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP8411 — 12V Input, 0.9V/90A Solution by Stacking Two 45A Modules Reference Design with PMBus

PMP8411 stacks two compact 2-phase 45A converters into a 4-phase 90A POL solution. It is suitable for the ASIC Processors for Telecom infrastructure, FPGA for Industry and Telecom applications, Generic High Current POL, or Generic Power with Dual output Configuration. It features TPS40425, 2-phase (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP8342 — 12V Input, 1V/45A Compact Point-of-Load PMBus Module with Dual Output Option Reference Design

PMP8342 is a compact 45A POL solution in 0.72" by 1.20" size, with flexible configuration for  single 45A or dual 23A rails. It is suitable for  ASIC Processors for Telecom infrastructure, FPGA for Industry and Telecom applications, Generic High Current POL, or Generic Power with Dual (...)
Test report: PDF
Schematic: PDF
Package Pins Download
VQFN (RHA) 40 View options
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