TPS54328

ACTIVE

4.5V to 18V Input, 3-A Synchronous Step-Down 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) 3 Iq (Typ) (uA) 800 Switching frequency (Min) (kHz) 700 Switching frequency (Max) (kHz) 700 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 Input Voltage Range: 4.5 V to 18 V
  • Output Voltage Range: 0.76 V to 7 V
  • Highly Efficient Integrated FETs Optimized for Lower Duty Cycle Applications
    • 100 mΩ (High-Side) and 70 mΩ (Low-Side)
  • High Efficiency, Less Than 10 µA at Shutdown
  • High Initial Bandgap Reference Accuracy
  • Adjustable Soft Start
  • Pre-Biased Soft Start
  • 700-kHz Switching Frequency (fSW)
  • Cycle-By-Cycle Overcurrent Limit
  • Auto-Skip Eco-Mode™ for High Efficiency at Light Load
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Description

The TPS54328 is an adaptive on-time D-CAP2™ mode synchronous buck converter. The TPS54328 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 TPS54328 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 TPS54328 to maintain high efficiency during lighter load conditions. The TPS54328 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 input (VIN).

The output voltage can be programmed from 0.76 V to 7 V. The device also features an adjustable soft start time. The TPS54328 is available in 8-pin DDA 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:
TPS54228 ACTIVE 4.5V to 18V Input, 2-A Synchronous Step-Down Converter with Eco-mode™ Pin-to-pin compatible lower current product (2 A).
TPS54428 ACTIVE 4.5V to 18V Input, 4-A Synchronous Step-Down SWIFT™ Converter with Eco-mode™ Pin-to-pin compatible higher current product (4 A).
Same functionality but is not pin-for-pin or parametrically equivalent to the compared device:
TPS563201 ACTIVE 4.5 V to 17 V input, 3 A output, synchronous step-down converter in Eco-mode This product has a smaller package with less external component count.
Similar but not functionally equivalent to the compared device:
NEW TPS563211 PREVIEW 4.2-V to 17-V, 3-A, synchronous buck converter with 1% accuracy, PG/SS and PFM/forced-PWM in SOT583 Upgrade with improved performance, pricing and smaller package.

Technical documentation

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Type Title Date
* Datasheet TPS54328 4.5-V to 18-V Input, 3-A Synchronous Step-Down Converter With Eco-Mode™ datasheet (Rev. D) Aug. 17, 2016
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
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 TPS54328EVM-686 3-A, SWIFT Regulator Evaluation Module Dec. 15, 2010

Design & development

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Hardware development

EVALUATION BOARD Download
25
Description

The TPS54328EVM-686 is a fully assembled and tested circuit for evaluating the TPS54328 synchronous step-down converter. The TPS54328EVM-686 operates from a 4.5-V to 18-V input and provides a 1.05-V output up to 3-A load. The main control loop of TPS54328 uses D-CAP2™ control mode, which (...)

Features
  • Fast load transient response
  • Low output ripple and allows ceramic output capacitor
  • Highly efficient integrated FETs optimized for low duty cycle applications
  • Adjustable soft start
  • Pre-biased soft start
  • 700-kHz switching frequency operation
  • Eco-mode: highly efficient in light load conditions

Design tools & simulation

SIMULATION MODEL Download
SLVM109A.ZIP (41 KB) - PSpice Model
SIMULATION MODEL Download
SLVM338.TSC (652 KB) - TINA-TI Reference Design
SIMULATION MODEL Download
SLVM339.ZIP (39 KB) - TINA-TI Spice Model
SIMULATION TOOL Download
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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
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CAD/CAE symbols

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

Ordering & quality

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