4.5-V to 18-V, stackable 35-A synchronous SWIFT™ buck converter with PMBus and telemetry


Product details


Vin (Min) (V) 4.5 Vin (Max) (V) 18 Vout (Min) (V) 0.35 Vout (Max) (V) 5.5 Iout (Max) (A) 35 Iq (Typ) (uA) 7700 Switching frequency (Min) (kHz) 200 Switching frequency (Max) (kHz) 1000 Features Adjustable Current Limit, Frequency Synchronization, I2C/PMBus, Phase Interleaving, Power Good, Synchronous Rectification, UVLO Adjustable, Voltage Margining, Differential Remote Sense, Enable, Adaptive/Dynamic Voltage Scaling, Forced PWM, Over Current Protection, Pre-Bias Start-Up, Soft Start Adjustable Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

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


  • PMBus™ 1.3 Compliant Converters: 35 A
  • 2-Device Stackable for up to 70 A With Current Sharing
  • Input Voltage Range: 4.5 V to 18 V
  • Output Voltage Range: 0.35 V to 5.5 V
  • Integrated 3.2-mΩ and 1.4-mΩ Stacked NexFET™ Power Stage
  • 350-mV to 1650-mV Reference for Adaptive Voltage Scaling (AVS) Function and Margining through PMBus
  • 0.5% Reference Accuracy at 600 mV and Above
  • Lossless Low-Side MOSFET Current Sensing
  • Voltage Mode Control With Input Feed-Forward
  • Differential Remote Sensing
  • Monotonic Start-Up into Pre-Biased Output
  • Output Voltage and Output Current Reporting
  • Internal Die Temperature Monitoring
  • 64 Programmable PMBus Addresses via ADDR0 and ADDR1 Pins
  • Programmable via the PMBus Interface:
    • OCP, UVLO, Soft-Start, PG, OV, UV, OT Levels, Fault Responses
    • Turnon and Turnoff Delays
  • Thermal Shutdown
  • Pin Strapping for Switching Frequency: 200 kHz to 1 MHz
  • Frequency Synchronization to an External Clock or Output Clock to Sync Out
  • Create a Custom Design Using the TPS546C23 With the WEBENCH® Power Designer
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The TPS546C23 devices are PMBus 1.3 Compliant, non-isolated DC/DC converters with integrated FETs, capable of high-frequency operation and 35-A current output from a 7-mm × 5-mm package. Two TPS546C23 devices can be paralleled together to provide up to 70-A load. Current sensing is realized by sampling a small portion of the power stage current and independent on the device temperature. High-frequency, low-loss switching, provided by an integrated NexFET power stage and optimized drivers, allows for very high-density power solutions. The PMBus interface enables the AVS functions through VOUT_COMMAND, flexible converter configuration, as well as key parameters monitoring including output voltage, current, and internal die temperature. Response to fault conditions can be set to either restart, latch-off or ignore depending on system requirements.

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Technical documentation

Design & development

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

Hardware development

document-generic User guide

The TPS546C23EVM1-746 evaluation module provides two separate buck converters that convert from a nominal 12-V bus to produce two regulated 0.9-V outputs, up to 35 A of load current each. The TPS546C23EVM1-746 is designed to demonstrate the TPS546C23 in a typical single-phase low output voltage (...)

  • 500-kHz operation
  • Current, voltage, and temperature monitoring via PMBus
  • 10-mVpp ripple at 35 A
  • Module supports 5-V to 18-V input
document-generic User guide

The TPS546C23EVM2-746 evaluation module combines two 35-A TPS546C23 buck converters in a stackable configuration to deliver a continuous 70-A output current and a regulated 1.2-V output from a nominal 12-V input bus. The evaluation module accomodates the PMBus interface with telemetry.

  • 500-kHz operation
  • Current, voltage, and temperature monitoring via PMBus
  • 10-mVpp ripple at 35 A
  • Module supports 5-V to 18-V input

Design tools & simulation

SLUM531.ZIP (289 KB) - PSpice Model
SLUM706.ZIP (53 KB) - IBIS 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
  • (...)

Reference designs

High-Density 12Vin, 1.2Vout, 60A POL Reference Design with Stacked TPS546C20A PMBus DCDC Converters
PMP20490 — The TPS546C23 provides a single IC for both control & the synchronous power stage for high current DC/DC applications and allows doubling of the current capability with use of two of the same part.  Multi-phase also allows output ripple cancellation and effective higher bandwidth control (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
LQFN-CLIP (RVF) 40 View options

Ordering & quality

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