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TPS546C20A

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

Data sheet
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4.5-V to 18-V, stackable 35-A synchronous SWIFT™ buck converter with PMBus and pin-strapping

TPS546C20A

ACTIVE
Data sheet Order now

Product details

Parameters

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)

Features

  • 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
  • 2 PMBus Addresses (Master 36d/Slave 37d)
  • Selectable Boot-up Vout and Soft Start Values via Pin-Strapping
  • 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 TPS546C20A With the WEBENCH® Power Designer

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Description

The TPS546C20A 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 TPS546C20A 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

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Type Title Date
* Data sheet TPS546C20A 4.5-V to 18-V, 35-A 2× Stackable Synchronous Buck Converters With PMBus Supporting Telemetry datasheet (Rev. C) Jun. 11, 2018
Application note Programming the NVM of PMBus Buck Converters to Support Mass-Production Needs (Rev. B) May 13, 2019
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Technical article Powering FPGAs - What to consider with Xilinx UltraScale+ FPGAs Jan. 29, 2018
Application note Analysis and Design of Input Filter for DC-DC Circuit Nov. 27, 2017
User guide TPS546C20AEVM2-746 Two-Phase Interleaving Evaluation Module Nov. 22, 2016
User guide TPS546C20AEVM1-746 Two, Separated Single-Phase Evaluation Module Jun. 21, 2016
Application note Method of Graphing Safe Operating Area (SOA) Curves in DC-DC Converter Mar. 30, 2016
Application note MOSFET power losses and how they affect power-supply efficiency Jan. 26, 2016

Design & development

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

Hardware development

EVALUATION BOARD Download
document-generic User guide
49
Description
The TPS546C20AEVM1-PWR746 evaluation module (EVM) uses the TPS546C20A. The TPS546C20A is a voltage mode, 35A synchronous buck converter with integrated MOSFETs. Two seperated converters are included on the EVM, both providing a 0.9V output at up to 35A from a 12V input bus.
Features
  • Two seperated PMBUS-Enabled BUCK converters. 35A DC steady state Ouput current from each converter.
  • ±0.5% 0.6VREF Tolerance Over -40 to 125°C Junction Temperature
  • 0.35V to 1.65V Adjustable VREF for AVS and Marginnig through PMBUS
  • True Differential Remote Sense Amplifier
  • Programmable OCP, UVLO, OV, UV, OT (...)
View details
EVALUATION BOARD Download
document-generic User guide
99
Description
The TPS546C20AEVM2-PWR746 evaluation module (EVM) uses two TPS546C20A devices. The TPS546C20A is a voltage mode, 35A synchronous buck converter with integrated MOSFETs. Two phase converters on the EVM provides a 0.9V output at up to 70A from a 12V input bus.
Features
  • Two phase interleaving PMBUS-Enabled BUCK converters. 70A DC steady state Ouput current.
  • ±0.5% 0.6VREF Tolerance Over -40 to 125°C Junction Temperature
  • 0.35V to 1.65V Adjustable VREF for AVS and Marginnig through PMBUS
  • True Differential Remote Sense Amplifier
  • Programmable OCP, UVLO, OV, UV, OT thresholds (...)
View details

Design tools & simulation

SIMULATION MODEL Download
SLUM530.ZIP (265 KB) - PSpice Model
SIMULATION MODEL Download
SLUM711.ZIP (1330 KB) - SIMPLIS Model
SIMULATION TOOL Download
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 (...)
Features
  • 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
  • (...)
View details

Reference designs

REFERENCE DESIGNS Download
High-Density 12Vin, 1.2Vout, 60A POL Reference Design with Stacked TPS546C20A PMBus DCDC Converters
PMP20292 — The TPS546C20A 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
REFERENCE DESIGNS Download
Reference Design: 8.5V-13.2V to 1.2V 50A DC/DC Converter
PMP20071 — The TPS546C20A 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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  • Ongoing reliability monitoring

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