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TPS54478

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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) (mA) 0.525 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2000 Features Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Soft Start Adjustable, Synchronous Rectification, Tracking, UVLO adjustable Operating temperature range (°C) -40 to 150 Rating Catalog Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 98 Type Converter
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) (mA) 0.525 Switching frequency (min) (kHz) 200 Switching frequency (max) (kHz) 2000 Features Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Soft Start Adjustable, Synchronous Rectification, Tracking, UVLO adjustable Operating temperature range (°C) -40 to 150 Rating Catalog Regulated outputs (#) 1 Control mode current mode Duty cycle (max) (%) 98 Type Converter
WQFN (RTE) 16 9 mm² 3 x 3
  • 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
  • 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

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 www.ti.com/swift.

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 www.ti.com/swift.

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Technical documentation

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Type Title Date
* Data sheet TPS54478 2.95-V to 6-V Input, 4-A Synchrns Step-Down SWIFT™ Cnvrtr w/ Hiccup datasheet (Rev. B) 18 Apr 2018
Application note Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 25 Mar 2024
Analog Design Journal Control-Mode Quick Reference Guide (Rev. B) PDF | HTML 29 Aug 2023
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
Application note Calculating Efficiency (Rev. A) 06 Mar 2020
Application note Minimizing Output Ripple During Startup (Rev. A) 20 May 2019
Selection guide SWIFT DC/DC Converters Selector Guide (Rev. G) 06 Feb 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note Minimizing Output Ripple During Startup 22 Jun 2017
User guide TPS54478EVM-037 4-A, SWIFT Regulator Evaluation Module 15 Jun 2011
Application note Understanding Thermal Dissipation and Design of a Heatsink 04 May 2011

Design & development

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

Evaluation board

TPS54478EVM-037 — Evaluation Module for TPS54478 Synchronous Step-Down Converter with Pre-bias Start-Up

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.
User guide: PDF
Not available on TI.com
Simulation model

TPS54478 TINA-TI Average Reference Design

SLVM762.TSC (237 KB) - TINA-TI Reference Design
Simulation model

TPS54478 TINA-TI Average Spice Model

SLVM761.ZIP (7 KB) - TINA-TI Spice Model
Simulation model

TPS54478 Unencrypted PSpice Average Model Package (Rev. A)

SLVM279A.ZIP (67 KB) - PSpice Model
Simulation model

TPS54478 Unencrypted PSpice Transient Model Package (Rev. A)

SLVMAE8A.ZIP (110 KB) - PSpice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Package Pins Download
WQFN (RTE) 16 View options

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