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 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 650 Switching frequency (Max) (kHz) 650 Features Enable, Light Load Efficiency, Synchronous Rectification, Soft Start Adjustable Control mode D-CAP2 Duty cycle (Max) (%) 65 Type Converter Operating temperature range (C) -40 to 85 Rating Catalog 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).
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
* Datasheet TPS54428 4.5-V to 18-V Input, 4-A Synchronous Step-Down Converter With Eco-Mode™ datasheet (Rev. D) Jan. 20, 2016
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Application notes Optimize Output Filter on D-CAP2 for Stability Improvement Jun. 13, 2017
Application notes D-CAP2 Frequency Response Model, based on frequency domain analysis of Fixed On- Jan. 02, 2013
User guides 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 BOARDS Download
document-generic User guide
$25.00
Description
The TPS54428EVM-052 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the TPS54428 Synchronous Step-Down DC-DC Converter with Eco-Mode. The EVM operates from a 4.5V to 18V input and provides a 1.05V output at up to 4A. The main control loop for the EVM uses D-CAP2 mode (...)
Features
  • 4.5V to 18V Input Voltage Range
  • D-CAP2 Mode Enables Fast Transient Response
  • 1.05V Output Voltage
  • 4A Output Current
  • Auto-Skip Eco Mode

Design tools & simulation

SIMULATION MODELS Download
SLVM455.ZIP (91 KB) - PSpice Model

CAD/CAE symbols

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

Ordering & quality

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