Product
0
TPS546B25
  • TPS546B25
  • TPS546B25
  • TPS546B25

TPS546B25

ACTIVE

4V to 18V input, 25A, stackable, PMBus synchronous step-down converter

Texas Instruments TPS546B25 Product Info

1 April 2026 2

Parameters

Rating

Catalog

Topology

Buck

Iout (max) (A)

25

Vin (max) (V)

18

Vin (min) (V)

4

Vout (max) (V)

5.5

Vout (min) (V)

0.4

Features

Adaptive/Dynamic Voltage Scaling, Adjustable current limit, Differential Remote Sense, Enable, Extended security, Forced PWM, I2C, Overcurrent protection, Phase Interleaving, Power good, Prebias startup, Soft-start adjustable, Stackable, Synchronous rectification, UVLO adjustable, Voltage Margining

Control mode

D-CAP4

Operating temperature range (°C)

-40 to 85

Iq (typ) (A)

0.0075

Duty cycle (max) (%)

85

Package

WQFN-FCRLF (RXX)-37-30 mm² 6 x 5

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 25A single-phase or 2 ×, 3 ×, or 4 × stacked configurations
  • Rdson_HS = 2.6mΩ, Rdson_LS = 1mΩ
  • 400kHz to 2MHz operating frequency (four discrete settings through pin-strap, additional settings through PMBus)
  • PMBus programmable
    • Revision 1.5 compliant with PASSKEY security feature
    • Input voltage, output voltage, output current, temperature telemetry
    • Programmable overcurrent, overvoltage, undervoltage, overtemperature protections
    • Includes single command write function in 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
  • 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 25A single-phase or 2 ×, 3 ×, or 4 × stacked configurations
  • Rdson_HS = 2.6mΩ, Rdson_LS = 1mΩ
  • 400kHz to 2MHz operating frequency (four discrete settings through pin-strap, additional settings through PMBus)
  • PMBus programmable
    • Revision 1.5 compliant with PASSKEY security feature
    • Input voltage, output voltage, output current, temperature telemetry
    • Programmable overcurrent, overvoltage, undervoltage, overtemperature protections
    • Includes single command write function in 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

Description

The TPS546B25 device is a highly-integrated buck converter with D-CAP4 control topology for fast transient response. All programmable parameters can be configured by the PMBus interface and stored in NVM as the new default values to minimize the external component count. Pin-strap options allow for configuration as primary or secondary, stack position and stack number, DCM (single phase only) or FCCM, overcurrent limit, fault response, internal or external feedback resistor, output voltage selection or range, switching frequency, and compensation.

The PMBus interface with 1MHz clock support gives a convenient, standardized, digital interface for configuration as well as telemetry of key parameters including 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 TPS546B25 devices can be interconnected to provide up to 100A on a single output.

The TPS546B25 has an option to overdrive the internal 4.5V LDO with an external 5V supply through the VDRV and VCC pins to improve efficiency, reduce power dissipation, and enable start-up with a lower input voltage.

The TPS546B25 is a lead-free device and is RoHS compliant without exemption.

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