2.95V to 6V Input, 4A 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) 4 Iq (Typ) (uA) 525 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 Operating temperature range (C) -40 to 150 Rating Catalog Regulated outputs (#) 1 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 30-mΩ (typical) MOSFETs for High Efficiency at 4-A Loads
  • 200-kHz to 2-MHz Switching Frequency
  • 0.6-V ± 1% Voltage Reference Over Temperature (–40°C to +150°C)
  • Start-up With Prebiased Voltage
  • Synchronizes to External Clock
  • Adjustable Slow Start / Sequencing
  • UV and OV Power-Good Output
  • Cycle by Cycle Current Limit and Hiccup Current Protection
  • Thermally Enhanced 3-mm × 3-mm 16-Pin WQFN (RTE)
  • Pin Compatible to TPS54418
  • Create a Custom Design Using the TPS54478 With the WEBENCH® Power Designer

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The TPS54478 device is a full featured 6-V, 4-A, synchronous step down current mode converter with two integrated MOSFETs.

The TPS54478 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.

The TPS54478 provides accurate regulation for a variety of loads with an accurate ±1% voltage reference (VREF) over temperature. Efficiency is maximized through the integrated 30-mΩ MOSFETs and 525-µA typical supply current. Using the enable pin, shutdown supply current is reduced to 2.5 µA by entering a shutdown mode.

Undervoltage lockout is internally set at 2.6 V, but can be increased by programming the threshold with a resistor network on the enable pin. The output voltage start-up ramp is controlled by the soft-start pin. An open-drain power-good signal indicates the output is within 93% to 107% of its nominal voltage.

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

For more SWIFT™ documentation, see the TI website at

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Technical documentation

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Type Title Date
* Datasheet TPS54478 2.95-V to 6-V Input, 4-A Synchrns Step-Down SWIFT™ Cnvrtr w/ Hiccup datasheet (Rev. B) Apr. 18, 2018
Selection guide Buck Converter Quick Reference Guide (Rev. A) Mar. 31, 2020
Application note Calculating Efficiency (Rev. A) Mar. 06, 2020
Application note 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 guide SWIFT DC/DC Converters Selector Guide (Rev. G) Feb. 06, 2019
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Selection guide Control-Mode Quick Reference Guide (Rev. A) Sep. 14, 2017
Application note Minimizing Output Ripple During Startup Jun. 22, 2017
Application note Semiconductor and IC Package Thermal Metrics (Rev. C) Apr. 19, 2016
User guide TPS54478EVM-037 4-A, SWIFT Regulator Evaluation Module Jun. 15, 2011
Application note 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

The TPS54478EVM-037 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the TPS54478 Synchronous Step-Down Switcher. The EVM operates from a 3V to 6V supply and provides a 1.8V output at 4A.
  • 2.95V to 6V Operation
  • 4A Output Current
  • 1.8V Output
  • Hiccup Model Current Limit
  • Start up into Pre-bias
  • 0.6V Internal Reference Voltage

Design tools & simulation

SLVM279A.ZIP (67 KB) - PSpice Model
SLVM761.ZIP (7 KB) - TINA-TI Spice Model
SLVM762.TSC (237 KB) - TINA-TI Reference Design
SLVMAE8A.ZIP (110 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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Reference designs

3V-6V input, 3A DC converter
PMP4358 — This design demonstrates high power density 3A sync-buck converter solution using TPS54478. The input voltage range is 3-6V. The overall form factor is 15.5mmx7.8mm.
Design files

CAD/CAE symbols

Package Pins Download
WQFN (RTE) 16 View options

Ordering & quality

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  • MSL rating/Peak reflow
  • MTBF/FIT estimates
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  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

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