TPS54428

ACTIVE

4.5V to 18V Input, 4-A Synchronous Step-Down SWIFT™ Converter with Eco-mode™

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Product details

Parameters

Vin (Min) (V) 4.5 Vin (Max) (V) 18 Vout (Min) (V) 0.76 Vout (Max) (V) 7 Iout (Max) (A) 4 Iq (Typ) (uA) 950 Switching frequency (Min) (kHz) 650 Switching frequency (Max) (kHz) 650 Features Enable, Light Load Efficiency, Synchronous Rectification, Soft Start Adjustable Operating temperature range (C) -40 to 85 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

HSOIC (DDA) 8 19 mm² 4.9 x 3.9 VSON (DRC) 10 9 mm² 3 x 3 open-in-new Find other Buck converters (integrated switch)

Features

  • D-CAP2™ Mode Enables Fast Transient
    Response
  • Low Output Ripple and Allows Ceramic Output
    Capacitor
  • Wide VIN Input Voltage Range: 4.5 V to 18 V
  • Output Voltage Range: 0.76 V to 7.0 V
  • Highly Efficient Integrated FETs Optimized
    for Lower Duty Cycle Applications
    – 70 mΩ (High Side) and 53 mΩ (Low Side)
  • High Efficiency, Less Than 10 µA at Shutdown
  • High Initial Bandgap Reference Accuracy
  • Adjustable Soft Start
  • Pre-Biased Soft Start
  • 650-kHz Switching Frequency (fSW)
  • Cycle By Cycle Over Current Limit
  • Auto-Skip Eco-mode™ for High Efficiency at Light
    Load
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Description

The TPS54428 is an adaptive on-time D-CAP2™ mode synchronous buck converter.

The TPS54428 enables system designers to complete the suite of various end-equipment power bus regulators with a cost effective, low component count, low standby current solution.

The main control loop for the TPS54428 uses the D-CAP2™ mode control that provides a fast transient response with no external compensation components.

The adaptive on-time control supports seamless transition between PWM mode at higher load conditions and Eco-mode™ operation at light loads.

Eco-mode™ allows the TPS54428 to maintain high efficiency during lighter load conditions.

The TPS54428 also has a proprietary circuit that enables the device to adopt to both low equivalent series resistance (ESR) output capacitors, such as POSCAP or SP-CAP, and ultra-low ESR ceramic capacitors. The device operates from 4.5-V to 18-V VIN input.

The output voltage can be programmed between 0.76 V and 7.0 V.

The device also features an adjustable soft start time.

The TPS54428 is available in 8-pin DDA package and 10-pin DRC packages, and is designed to operate over the ambient temperature range of –40°C to 85°C.

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Same functionality and pinout but is not an equivalent to the compared device:
TPS54328 ACTIVE 4.5V to 18V Input, 3-A Synchronous Step-Down Converter with Eco-mode™ This product offers lower current (3 A).
TPS54528 ACTIVE 4.5V to 18V Input, 5-A Synchronous Step-Down Converter with Eco-mode™ This product offers higher current (5 A).
Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
NEW TLV62595 ACTIVE 2.5-V to 5.5-V input, 4-A step-down converter with 1% output accuracy in 1.5-mm x 1.5-mm QFN package Newer generation of TPS54418
Similar but not functionally equivalent to the compared device:
TPS564201 ACTIVE 4.5 V to 17 V input, 4 A output, synchronous step-down converter in Eco-mode Simplify design with minimum external component count.

Technical documentation

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Type Title Date
* Data sheet TPS54428 4.5-V to 18-V Input, 4-A Synchronous Step-Down Converter With Eco-Mode™ datasheet (Rev. D) Jan. 20, 2016
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Application note Optimize Output Filter on D-CAP2 for Stability Improvement Jun. 13, 2017
Application note D-CAP2 Frequency Response Model, based on frequency domain analysis of Fixed On- Jan. 02, 2013
User guide TPS54528, 4-A, SWIFT™ Regulator Evaluation Module Nov. 30, 2011

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 TPS54428EVM-052 is a fully assembled and tested circuit for evaluating the TPS54428 synchronous step-down converter. The EVM operates from a 4.5-V to 18-V input and provides a 1.05-V output up to 4 A. The main control loop of TPS54428 uses D-CAP2™ mode control, which provides a very fast (...)

Features
  • Fast load transient response
  • Low output ripple and allows ceramic output capacitor
  • Highly efficient integrated MOSFETs optimized for low duty cycle applications
  • Adjustable soft start
  • Pre-biased soft start

Design tools & simulation

SIMULATION MODEL Download
SLVM455.ZIP (91 KB) - PSpice 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
  • (...)

CAD/CAE symbols

Package Pins Download
SO PowerPAD (DDA) 8 View options
VSON (DRC) 10 View options

Ordering & quality

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  • Qualification summary
  • Ongoing reliability monitoring

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