2.95-V to 16-V, stackable 40-A synchronous SWIFT™ buck converter with PMBus

A newer version of this product is available
Drop-in replacement with upgraded functionality to the compared device.
TPS546D24A ACTIVE 2.95-V to 16-V, stackable 40-A synchronous SWIFT™ buck converter with pin-strapping and PMBus Includes MSEL programming enhancements to set switching frequency, internal compensation parameters, and more.

Product details


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Package | Pins | Size

LQFN-CLIP (RVF) 40 35 mm² 7 x 5 open-in-new Find other Buck converters (integrated switch)


  • Split Rail Support: 2.95-V to 16-V PVIN;
    2.95-V to 18-V AVIN (4-VIN VDD5 for Switching)
  • Integrated 4.5-mΩ/0.9-mΩ MOSFETs
  • Average Current Mode Control With Selectable Internal Compensation
  • 2×, 3x, 4× Stackable With Current Sharing up to 160 A, Supporting a Single Address per Output
  • Selectable 0.6-V to 5.5-V Output via Pin Strap or 0.25-V to 5.5-V via PMBus VOUT_COMMAND
  • Extensive PMBus Command Set With Telemetry for VOUT, IOUT and Internal Die Temperature
  • Differential Remote Sensing With Internal FB Divider for < 1% VOUT Error –40°C to +150°C TJ
  • AVS and Margining Capabilities Through PMBus
  • MSEL Pins Pin Programming PMBus Defaults
  • 12 Selectable Switching Frequencies from 225 kHz to 1.5 MHz (8 Pin-Strap Options)
  • Frequency Sync In/Sync Out
  • Supports Prebiased Output
  • Supports Strongly Coupled Inductor
  • 7 mm × 5 mm × 1.5 mm, 40-pin QFN,
    Pitch = 0.5 mm
  • Create a Custom Design Using the TPS546D24 With WEBENCH® Power Designer
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The TPS546D24 is a highly integrated, non-isolated DC/DC converter capable of high frequency operation and 40-A current output from a 7-mm × 5-mm package. Two, three, and four TPS546D24 devices can be interconnected to provide up to 160 A on a single output. The device has an option to overdrive the internal 5-V LDO with an external 5-V supply via the VDD5 pin to improve efficiency and reduce power dissipation of the converter.

The TPS546D24 uses a proprietary fixed-frequency current-mode control with input feedforward and selectable internal compensation components for minimal size and stability over a wide range of output capacitances.

The PMBus interface with 1-MHz clock support gives a convenient, standardized digital interface for converter configuration as well as monitoring 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. Back-channel communication between stacked devices enables all TPS546D24 converters powering a single output rail to share a single address to simplify system software/firmware design. Key parameters including output voltage, switching frequency, soft-start time, and overcurrent fault limits can also be configured through BOM selection without PMBus communication to support program free power-up.

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Technical documentation

Design & development

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Hardware development


The TPS546D24AEVM-2PH evaluation module is a two-phase interleaved power supply with two TPS546D24 devices on the board. The design provides a regulated 0.8-V output up to 80-A DC steady-state output current. The device allows programming and monitoring via the PMBus interface. Output current is (...)

  • 550-kHz operation
  • Current, voltage, and temperature monitoring via PMBus
  • 5-mVpp ripple at 80 A
  • Module supports 5-V to 16-V input

Design tools & simulation

SLUM659.ZIP (230 KB) - PSpice Model
SLUM692.ZIP (69 KB) - PSpice Model
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 (...)
  • 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
  • (...)

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LQFN-CLIP (RVF) 40 View options

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