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Texas Instruments TPS546C25 4x Stackable Buck Converter

Texas Instruments TPS546C25 4x Stackable Buck Converter is highly integrated, with a D-CAP4 control topology for fast transient response. All programmable parameters on the TPS546C25 can be configured via the PMBus interface and stored in NVM as new default values, minimizing the external component count. Implementing pin-strap options makes it easy to configure primary or secondary operation, stack position, operating mode (DCM or FCCM), overcurrent behavior, feedback type, output voltage, switching frequency, and compensation.

The PMBus interface with 1MHz clock support provides a convenient, standardized digital interface for the configuration and telemetry of key parameters, incorporating output voltage, output current, and internal die temperature. Response to fault conditions can be set to restart, latch off, or ignore, depending on system requirements.

Two, three, and four TI TPS546C25 converters can be interconnected to supply up to 140A on a single output. The TPS546C25 offers the option to overdrive the internal 4.5V LDO with an external 5V supply to enhance efficiency, reduce power dissipation, and enable start-up at a lower input voltage.

The TPS546C25 is a lead-free device and is RoHS compliant without exemption.

Features

  • 2.7V to 18V input voltage with external bias
  • 4V to 18V input voltage without external bias
  • 0.4V to 5.5V output voltage
  • Supports 35A single-phase or 2x, 3x, or 4x stacked configurations
  • Rdson_HS = 3.3m2, Rdson_LS = 1mQ
  • 400kHz to 2MHz operating frequency (four discrete settings through pin-strap, additional settings through PM Bus®)
  • PMBus programmable
    • Revision 1.5 is compliant with the PASSKEY security feature
    • Input voltage, output voltage, output current, temperature telemetry
    • Programmable overcurrent, overvoltage, undervoltage, and overtemperature protections
    • Includes a single command write function in a stacked configuration
    • Extended write protection feature
    • Non-volatile memory to store configuration settings
  • Two methods for programming the output voltage
    • Internal resistor divider (discrete settings) with boot-up voltage selected by pin-strapping
    • External resistor divider (continuous settings) with boot-up voltage selected by VBOOT
  • Precision voltage reference and differential remote sense for high output accuracy
    • ±0.5% DAC accuracy from 0°C to +85°C junction
    • ±0.85% VOUT tolerance from -40°C to +125°C junction
  • Selectable FCCM/DCM in single phase only
  • Start-up without PMBus communication through pin-strapping
  • Safe start-up into prebiased output
  • 0.5ms to 16ms programmable soft-start time
  • D-CAP4 control topology with fast transient response, supporting all ceramic output capacitors
  • Programmable internal loop compensation
  • Selectable cycle-by-cycle valley current limit
  • Open-drain power-good output

Applications

  • Server and cloud-computing POLs
  • Hardware accelerator
  • Network interface card (NIC)

Evaluation Module

Texas Instruments TPS546C25EVM-1PH Evaluation Module

A single-phase buck design employing the TPS546C25 in a low-output voltage application.

Learn Moreabout Texas Instruments TPS546C25EVM-1PH Evaluation Module View Productsrelated to Texas Instruments TPS546C25EVM-1PH Evaluation Module

Typical Efficiency

Performance Graph - Texas Instruments TPS546C25 4x Stackable Buck Converter

Functional Block Diagram Internal Feedback

Block Diagram - Texas Instruments TPS546C25 4x Stackable Buck Converter

Functional Block Diagram External Feedback

Block Diagram - Texas Instruments TPS546C25 4x Stackable Buck Converter
Published: 2026-01-20 | Updated: 2026-01-20