TPS56428

ACTIVE

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

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Product details

Parameters

Vin (Min) (V) 4.5 Vin (Max) (V) 18 Vout (Min) (V) 0.6 Vout (Max) (V) 5.5 Iout (Max) (A) 4 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 650 Switching frequency (Max) (kHz) 650 Features Enable, Light Load Efficiency, Power Good, Synchronous Rectification, Soft Start Fixed 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 VQFN (RHL) 14 12 mm² 3.5 x 3.5 open-in-new Find other Buck converters (integrated switch)

Features

  • D-CAP2™ Mode at 650kHz Switching for Fast
    Transient Response, Ceramic Capacitor Support
  • VIN Input Voltage Range: 4.5 V to 18 V
  • Output Voltage Range: 0.6 V to 7.0 V
  • Advanced Eco-mode for High Light Load
    Efficiency
  • Integrated FETs Optimized for Lower Duty Cycle
    – 68 mΩ (High Side) and 37 mΩ (Low Side)
  • Shutdown Current Less Than 10 µA
  • 1% Initial Reference Voltage Accuracy
  • Soft Start with Pre-Bias Output Support
  • Cycle By Cycle Over Current Limit
  • Power Good Output
  • Fixed Soft Start : 1.0ms
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Description

The TPS56428 is a D-CAP2 mode synchronous buck converter which is optimized for various power bus regulation needs with a cost effective, low component count, low standby current solution.

The D-CAP2 mode control provides a fast transient response with no external compensation components. This adaptive on-time control supports seamless transition between PWM mode at higher load conditions and advanced Eco-mode operation at light loads. Advanced Eco-mode™ maintains higher efficiency during lighter load conditions than traditional skip mode.

The TPS56428 also has a proprietary circuit 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 and its output voltage can be programmed between 0.6V and 7.0V. The device also features a fixed 1-ms soft start and a power-good output.

The TPS56428 is available in 8-pin SOIC-8 and 14-pin QFN packages 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).
TPS56528 ACTIVE 4.5V to 18V Input, 5-A Synchronous Step-Down Converter with Advanced 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 TPS56428 4.5-V to 18-V Input, 4-A Sync. Step-Down Converter with Advanced Eco-mode™ datasheet (Rev. B) Jan. 22, 2015
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
User guides TPS56428EVM-534, 4-A, Regulator Evaluation Module Mar. 05, 2013

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 Texas Instruments TPS56428EVM-534 evaluation module (EVM) helps designers evaluate the performance of the TPS56428 4.5V to 18V Input, 4A Synchronous Step-Down Converter with Eco-Mode.
Features
  • D-CAP2 Control
  • Eco-Mode
  • Internal Slow Start
  • Power Good
  • Integrated FETs

Design tools & simulation

SIMULATION MODELS Download
SLVM854.ZIP (69 KB) - PSpice Model

CAD/CAE symbols

Package Pins Download
SO PowerPAD (DDA) 8 View options
VQFN (RHL) 14 View options

Ordering & quality

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