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TPS54478

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Convertidor SWIFT™ sincrónico reductor 2.95 a 6 V de entrada y 4 A con límite corriente de Hiccup

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TPS54478

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Detalles del producto

Rating Catalog Topology Buck Iout (max) (A) 4 Vin (max) (V) 6 Vin (min) (V) 2.95 Vout (max) (V) 4.5 Vout (min) (V) 0.6 Features Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Soft Start Adjustable, Synchronous Rectification, Tracking, UVLO adjustable Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.000525 Duty cycle (max) (%) 98
Rating Catalog Topology Buck Iout (max) (A) 4 Vin (max) (V) 6 Vin (min) (V) 2.95 Vout (max) (V) 4.5 Vout (min) (V) 0.6 Features Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Soft Start Adjustable, Synchronous Rectification, Tracking, UVLO adjustable Control mode current mode Operating temperature range (°C) -40 to 150 Iq (typ) (A) 0.000525 Duty cycle (max) (%) 98
WQFN (RTE) 16 9 mm² (3 mm × 3 mm)
  • 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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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Descargar la versión más reciente en inglés Fecha
* Hoja de datos TPS54478 2.95-V to 6-V Input, 4-A Synchrns Step-Down SWIFT™ Cnvrtr w/ Hiccup datasheet (Rev. B) 18/04/2018
Nota sobre la aplicación Semiconductor and IC Package Thermal Metrics (Rev. D) PDF | HTML 25/03/2024
Analog Design Journal Control-Mode Quick Reference Guide (Rev. B) PDF | HTML 29/08/2023
Guía de selección Buck Converter Quick Reference Guide (Rev. B) 8/04/2021
Nota sobre la aplicación Calculating Efficiency (Rev. A) 6/03/2020
Nota sobre la aplicación Minimizing Output Ripple During Startup (Rev. A) 20/05/2019
Guía de selección SWIFT DC/DC Converters Selector Guide (Rev. G) 6/02/2019
Guía de selección Power Management Guide 2018 (Rev. R) 25/06/2018
EVM User's guide TPS54478EVM-037 4-A, SWIFT Regulator Evaluation Module 15/06/2011
Nota sobre la aplicación Understanding Thermal Dissipation and Design of a Heatsink 4/05/2011

Diseño y desarrollo

Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.

Placa de evaluación

TPS54478EVM-037 — Módulo de evaluación para convertidor reductor síncrono TPS54478 con inicio prepolarizado

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.
Guía del usuario: PDF
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Modelo de simulación

TPS54478 TINA-TI Average Reference Design

SLVM762.TSC (237 KB) - Diseño de referencia TINA-TI
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TPS54478 TINA-TI Average Spice Model

SLVM761.ZIP (7 KB) - Modelo TINA-TI Spice
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Modelo de simulación

TPS54478 Unencrypted PSpice Average Model Package (Rev. A)

SLVM279A.ZIP (67 KB) - Modelo PSpice
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TPS54478 Unencrypted PSpice Transient Model Package (Rev. A)

SLVMAE8A.ZIP (110 KB) - Modelo PSpice
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Encapsulado Pines Símbolos CAD, huellas y modelos 3D
WQFN (RTE) 16 Ultra Librarian
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Soporte y capacitación

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