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TPS543320 ACTIVE 4-V to 18-V, 3-A synchronous SWIFT™ step-down converter Upgraded product offering higher efficiency and a smaller solution size.

Product details

Vin (Min) (V) 4.5 Vin (Max) (V) 17 Vout (Min) (V) 0.8 Vout (Max) (V) 15 Iout (Max) (A) 3 Iq (Typ) (uA) 600 Switching frequency (Min) (kHz) 200 Switching frequency (Max) (kHz) 1200 Features Enable, Frequency Synchronization, Power Good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Rating Catalog Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 98
Vin (Min) (V) 4.5 Vin (Max) (V) 17 Vout (Min) (V) 0.8 Vout (Max) (V) 15 Iout (Max) (A) 3 Iq (Typ) (uA) 600 Switching frequency (Min) (kHz) 200 Switching frequency (Max) (kHz) 1200 Features Enable, Frequency Synchronization, Power Good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Rating Catalog Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 98
VQFN (RHL) 14 12 mm² 3.5 x 3.5
  • Integrated 57-mΩ / 50-mΩ MOSFETs
  • Split Power Rail: 1.6 to 17 V on PVIN
  • 200-kHz to 1.2-MHz Switching Frequency
  • Synchronizes to External Clock
  • 0.8-V Voltage Reference With ±1% Accuracy
  • Low 2-µA Shutdown Quiescent Current
  • Hiccup Overcurrent Protection
  • Monotonic Start-Up into Prebiased Outputs
  • –40°C to 150°C Operating Junction Temperature Range
  • Pin-to-Pin Compatible With the TPS54620
  • Adjustable Slow Start/Power Sequencing
  • Power Good Output for Undervoltage and Overvoltage Monitoring
  • Adjustable Input Undervoltage Lockout (UVLO)
  • Supported by SwitcherPro™ Software Tool
  • For SWIFT™ Documentation and SwitcherPro, Visit www.ti.com/swift
  • Create a Custom Design Using the TPS54320 With the WEBENCH® Power Designer
  • Integrated 57-mΩ / 50-mΩ MOSFETs
  • Split Power Rail: 1.6 to 17 V on PVIN
  • 200-kHz to 1.2-MHz Switching Frequency
  • Synchronizes to External Clock
  • 0.8-V Voltage Reference With ±1% Accuracy
  • Low 2-µA Shutdown Quiescent Current
  • Hiccup Overcurrent Protection
  • Monotonic Start-Up into Prebiased Outputs
  • –40°C to 150°C Operating Junction Temperature Range
  • Pin-to-Pin Compatible With the TPS54620
  • Adjustable Slow Start/Power Sequencing
  • Power Good Output for Undervoltage and Overvoltage Monitoring
  • Adjustable Input Undervoltage Lockout (UVLO)
  • Supported by SwitcherPro™ Software Tool
  • For SWIFT™ Documentation and SwitcherPro, Visit www.ti.com/swift
  • Create a Custom Design Using the TPS54320 With the WEBENCH® Power Designer

The TPS54320 is a full-featured 17-V, 3-A synchronous step-down converter which is optimized for small designs through high efficiency and integrated high-side and low-side MOSFETs. Further space savings are achieved through current mode control, which reduces component count, and by selecting a high switching frequency, reducing footprint of the inductor.

The output voltage start-up ramp is controlled by the SS/TR pin which allows operation as either a stand-alone power supply or in tracking situations. Power sequencing is also possible by correctly configuring the enable and the open drain power good pins.

Cycle by cycle current limiting on the high-side FET protects the device in overload situations and is enhanced by a low-side sourcing current limit which prevents current runaway. Hiccup protection is triggered if the overcurrent condition has persisted for longer than the preset time. Thermal shutdown disables the part when die temperature exceeds thermal shutdown temperature. The TPS54320 is available in a 14-pin, 3.5-mm × 3.5-mm VQFN, thermally enhanced package.

The TPS54320 is a full-featured 17-V, 3-A synchronous step-down converter which is optimized for small designs through high efficiency and integrated high-side and low-side MOSFETs. Further space savings are achieved through current mode control, which reduces component count, and by selecting a high switching frequency, reducing footprint of the inductor.

The output voltage start-up ramp is controlled by the SS/TR pin which allows operation as either a stand-alone power supply or in tracking situations. Power sequencing is also possible by correctly configuring the enable and the open drain power good pins.

Cycle by cycle current limiting on the high-side FET protects the device in overload situations and is enhanced by a low-side sourcing current limit which prevents current runaway. Hiccup protection is triggered if the overcurrent condition has persisted for longer than the preset time. Thermal shutdown disables the part when die temperature exceeds thermal shutdown temperature. The TPS54320 is available in a 14-pin, 3.5-mm × 3.5-mm VQFN, thermally enhanced package.

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Technical documentation

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Type Title Date
* Data sheet TPS54320 4.5- to 17-V Input, 3-A Synchronous Step Down SWIFT™ Converter datasheet (Rev. C) 16 Apr 2018
User guide TPS54320 Step-Down Converter Evaluation Module User's Guide (Rev. A) PDF | HTML 11 Oct 2021
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
Application note Calculating Efficiency (Rev. A) 06 Mar 2020
Application note Minimizing Output Ripple During Startup (Rev. A) 20 May 2019
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019
Selection guide SWIFT DC/DC Converters Selector Guide (Rev. G) 06 Feb 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note Minimizing Output Ripple During Startup 22 Jun 2017
Application note Semiconductor and IC Package Thermal Metrics (Rev. C) PDF | HTML 19 Apr 2016
White paper Minimum Power Specifications for High-Performance ADC Power-Supply Designs 31 Mar 2016
Technical article Designing a power supply solution for pipeline ADCs – Part 2 04 Sep 2015
Application note Output Ripple Voltage for Buck Switching Regulator (Rev. A) 13 Oct 2014
Application note Demystifying Type II and Type III Compensators Using Op-Amp and OTA for DC/DC Co 11 Jul 2014
Application note Understanding Thermal Dissipation and Design of a Heatsink 04 May 2011
Application note Designing Type III Compensation for Current Mode Step-Down Converters (Rev. A) 15 Sep 2010

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

TPS54320EVM-513 — Evaluation Module for TPS54320 4.5V to 17V Input, 3A Synchronous Step Down SWIFT™ Converter

The TPS54320EVM-513 is a fully assembled and tested circuit for evaluating the TPS54320 synchronous step-down SWIFT™ converter. The EVM converts a 8-V to 17-V input voltage to a regulated 3.3-V output voltage that delivers up to 3 A. The switching frequency is externally set at a nominal (...)

User guide: PDF | HTML
Not available on TI.com
Simulation model

TPS54320 TINA-TI Average Reference Design

SLVMA70.TSC (144 KB) - TINA-TI Reference Design
Simulation model

TPS54320 TINA-TI Average Spice Model

SLVMA69.ZIP (7 KB) - TINA-TI Spice Model
Simulation model

TPS54320 TINA-TI Transient Reference Design

SLVM678.TSC (660 KB) - TINA-TI Reference Design
Simulation model

TPS54320 TINA-TI Transient Spice Model

SLVM677.ZIP (51 KB) - TINA-TI Spice Model
Simulation model

TPS54320 Unencrypted PSpice Average Model Package (Rev. A)

SLVM896A.ZIP (29 KB) - PSpice Model
Simulation model

TPS54320 Unencrypted PSpice Transient Model Package (Rev. A)

SLVM451A.ZIP (77 KB) - PSpice Model
Calculation tool

TPS54620DESIGN-CALC — TPS54620 & TPS54XXX Current-Mode Step-Down Converter Design Calculator

The Design Calculator Plus Application Note (SLVA352A) Calculator Tool calculates the critical external component values for the TPS54620/TPS54622/TPS54521/TPS54320/TPS54618/TPS54418/TPS54318/TPS54218/TPS54319. The calculator includes power stage design, feature design and Type II and Type III (...)
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Reference designs

TIDEP0011 — Power Solution for C667x DSP AVS Core (CVDD) with Dynamic Voltage Scaling

This reference design aims to supply the AVS core supply (CVDD) in the Keystone Multicore DSPs, mainly the C66x series. The C66x series uses SmartReflex technology to enable the DSP to control its supply voltage. In order to meet this requirement, this design combines a Synchronous Buck Converter (...)
Test report: PDF
Schematic: PDF
Package Pins Download
VQFN (RHL) 14 View options

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