2.95V to 6V Input, 6A Synchronous Step-Down SWIFT™ Converter with Hiccup Current Limit


Product details


Vin (Min) (V) 2.95 Vin (Max) (V) 6 Vout (Min) (V) 0.6 Vout (Max) (V) 4.5 Iout (Max) (A) 6 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 200 Switching frequency (Max) (kHz) 2000 Features Enable, Frequency Synchronization, Power Good, Pre-Bias Start-Up, Synchronous Rectification, Tracking, UVLO Adjustable, Soft Start Adjustable Control mode Current Mode Duty cycle (Max) (%) 98 Type Converter Operating temperature range (C) -40 to 125, -40 to 150 Rating Catalog open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

WQFN (RTE) 16 9 mm² 3 x 3 open-in-new Find other Buck converters (integrated switch)


  • Two 12-mΩ (typical) MOSFETs for high-efficiency 6-A continuous output current
  • 200-kHz to 2-MHz Switching frequency
  • 0.6-V ±1% Voltage reference over temperature (–40°C to 150°C)
  • Synchronizes to external clock
  • Start-Up with prebiased voltage
  • Power good output
  • Adjustable slow start and sequencing
  • Cycle-by-cycle current limit and hiccup current protection
  • Adjustable input voltage UVLO
  • Thermally enhanced 16-pin 3-mm × 3-mm WQFN (RTE)
  • Create a custom design using the TPS54678 with the WEBENCH® Power Designer

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TPS54678 device is a full-featured 6-V, 6-A, synchronous step-down current mode converter with two integrated MOSFETs.

TPS54678 enables small designs by integrating the MOSFETs, implementing current mode control to reduce external component count, reducing inductor size by enabling up to 2-MHz switching frequency, and minimizing the IC footprint with a small 3-mm × 3-mm thermally enhanced WQFN package.

TPS54678 provides accurate regulation for a variety of loads with an accurate ±1% voltage reference (VREF) over temperature.

Efficiency is maximized through the integrated 12-mΩ MOSFETs. Using the enable (EN) pin, shutdown supply current is reduced by disabling the device.

The output voltage start-up ramp is controlled by the soft-start (SS) pin that can also be configured for sequencing or tracking. Monotonic start-up is achieved with prebiased voltage. Undervoltage lockout can be increased by programming the threshold with a resistor divider on the enable pin. An open-drain power good signal indicates the output is within 93% to 105% of its nominal voltage.

Cycle-by-cycle current limit, hiccup overcurrent protection and thermal shutdown protect the device during an overcurrent condition.

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Technical documentation

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Type Title Date
* Datasheet TPS54678 2.95-V to 6-V Input, 6-A Synchronous Step-Down SWIFT™ Converter With Hiccup Current Limit datasheet (Rev. B) May 06, 2019
Selection guides Buck Converter Quick Reference Guide (Rev. A) Mar. 31, 2020
Application notes Calculating Efficiency (Rev. A) Mar. 06, 2020
Application notes Minimizing Output Ripple During Startup (Rev. A) May 20, 2019
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Selection guides SWIFT DC/DC Converters Selector Guide (Rev. G) Feb. 06, 2019
Application notes Minimizing Output Ripple During Startup Jun. 22, 2017
Application notes Semiconductor and IC Package Thermal Metrics (Rev. C) Apr. 19, 2016
Technical articles Power Tips: Designing a two-stage LC filter Feb. 24, 2015
User guides TPS54678EVM-155 6-A, SWIFT™ Regulator Evaluation Module Jun. 13, 2012
Application notes Understanding Thermal Dissipation and Design of a Heatsink May 04, 2011

Design & development

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

Hardware development

TPS54678 Evaluation Module
document-generic User guide
The Texas Instruments TPS54678EVM-155 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the TPS54678 2.95V to 6V Output, 2MHz Synchronous Step-Down Switcher.
  • UCD3138LLCEVM-028 LLC Resonant Half-Bridge DC/DC Converter Board
  • UCD3138CC64EVM-030 Control Card pre-programmed with LLC Resonant Half-bridge DC/DC Converter
  • USB Interface Adapter EVM (part number USB-to-GPIO)

Design tools & simulation

SLVM610A.ZIP (37 KB) - PSpice Model
SLVMAG0A.ZIP (124 KB) - PSpice Model
SLVMAH0.TSC (274 KB) - TINA-TI Reference Design
SLVMAH1.TSC (319 KB) - TINA-TI Reference Design
SLVMAH2.ZIP (47 KB) - TINA-TI Spice Model

Reference designs

3-6Vin, 0.6-3.3Vo/6A Pico Module Reference Design
PMP4481 The PMP4481 reference design is designed for telecom application with a DC input of 3V~6V achieving the lowest component count. Detailed data is provided. The output voltage could be modified by resistors over the resistor divider from 0.6V to 3.3V. A typical application is for 0.9V/6A.
document-generic Schematic document-generic User guide
3.3V 5A Buck Converter with 2-Stage LC Filter Reference Design
PMP10900 PMP10900 is designed to provide a 3.3V/5A output from 5V input. A two-stage LC filter is used to reach output ripple voltage <1mV.
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
WQFN (RTE) 16 View options

Ordering & quality

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