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


Product details


Vin (Min) (V) 4.5 Vin (Max) (V) 18 Vout (Min) (V) 0.6 Vout (Max) (V) 5.5 Iout (Max) (A) 4 Iq (Typ) (uA) 250 Switching frequency (Min) (kHz) 650 Switching frequency (Max) (kHz) 650 Features Enable, Light Load Efficiency, Power Good, Synchronous Rectification, Soft Start Fixed 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 VQFN (RHL) 14 12 mm² 3.5 x 3.5 open-in-new Find other Buck converters (integrated switch)


  • 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
  • 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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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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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 functionality 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 TPS56428 4.5-V to 18-V Input, 4-A Sync. Step-Down Converter with Advanced Eco-mode™ datasheet (Rev. B) Jan. 22, 2015
User guide TPS56428 Buck Converter Evaluation Module User's Guide (Rev. A) Jun. 25, 2021
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019

Design & development

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Hardware development

document-generic User guide
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.
  • D-CAP2 Control
  • Eco-Mode
  • Internal Slow Start
  • Power Good
  • Integrated FETs

Design tools & simulation

SLVM854.ZIP (69 KB) - PSpice Model
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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 (...)
  • 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
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CAD/CAE symbols

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

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