4.5V to 17V Input, 3A Synchronous Step-Down SWIFT™ Converter


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 Operating temperature range (C) -40 to 150 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

VQFN (RHL) 14 12 mm² 3.5 x 3.5 open-in-new Find other Buck converters (integrated switch)


  • 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
  • Create a Custom Design Using the TPS54320 With the WEBENCH® Power Designer

All trademarks are the property of their respective owners.

open-in-new Find other Buck converters (integrated switch)


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.

open-in-new Find other Buck converters (integrated switch)
Similar products you might be interested in
open-in-new Compare products
Pin-for-pin with same functionality to the compared device.
TPS54620 ACTIVE 4.5-V to 17-V, 6-A synchronous SWIFT™ buck converter 6-A pin-to-pin compatible product offering higher current.
Same functionality with different pin-out to the compared device.
NEW TPS543320 ACTIVE 4-V to 18-V, 3-A synchronous SWIFT™ step-down converter Upgraded product offering higher efficiency and a smaller solution size.
TPS82130 ACTIVE 17-V input 3-A step-down converter module with integrated inductor This product is a power module.

Technical documentation

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 16
Type Title Date
* Data sheet TPS54320 4.5- to 17-V Input, 3-A Synchronous Step Down SWIFT™ Converter datasheet (Rev. C) Apr. 16, 2018
Selection guide Buck Converter Quick Reference Guide (Rev. B) Apr. 08, 2021
Application note Calculating Efficiency (Rev. A) Mar. 06, 2020
Application note Minimizing Output Ripple During Startup (Rev. A) May 20, 2019
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Selection guide SWIFT DC/DC Converters Selector Guide (Rev. G) Feb. 06, 2019
Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Application note Minimizing Output Ripple During Startup Jun. 22, 2017
Application note Semiconductor and IC Package Thermal Metrics (Rev. C) Apr. 19, 2016
White paper Minimum Power Specifications for High-Performance ADC Power-Supply Designs Mar. 31, 2016
Technical article Designing a power supply solution for pipeline ADCs – Part 2 Sep. 04, 2015
Application note Output Ripple Voltage for Buck Switching Regulator (Rev. A) Oct. 13, 2014
Application note Demystifying Type II and Type III Compensators Using Op-Amp and OTA for DC/DC Co Jul. 11, 2014
Application note Understanding Thermal Dissipation and Design of a Heatsink May 04, 2011
Application note Designing Type III Compensation for Current Mode Step-Down Converters (Rev. A) Sep. 15, 2010
User guide TPS54320 User's Guide May 11, 2010

Design & development

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

Hardware development

document-generic User guide

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 (...)

  • 8-V to 17-V input voltage range
  • 94.9% efficiency (VIN = 8 V, IO = 0.9 A)
  • 0.8V +/-1% voltage reference over temperature
  • 2uA shutdown quiescent current
  • 200-kHz to 1.2-MHz switching frequency
  • Approximate circuit area of 227 sq. mm

Design tools & simulation

SLVM451A.ZIP (77 KB) - PSpice Model
SLVM677.ZIP (51 KB) - TINA-TI Spice Model
SLVM678.TSC (660 KB) - TINA-TI Reference Design
SLVM896A.ZIP (29 KB) - PSpice Model
SLVMA69.ZIP (7 KB) - TINA-TI Spice Model
SLVMA70.TSC (144 KB) - TINA-TI Reference Design
PSpice® for TI design and simulation tool
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
  • (...)
TPS54620 & TPS54XXX Current-Mode Step-Down Converter Design Calculator
TPS54620DESIGN-CALC — 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 (...)
SLVC219E.ZIP (54 KB)
SLVC439A.ZIP (101 KB)

Reference designs

Synchronous buck converters (3.3V@0.5A)
PMP5547 — This synchronous buck converter has an output voltage of 3.3V @ 0.5A and an input voltage range of 14..15V DC.
Design files
Power Solution for C667x DSP AVS Core (CVDD) with Dynamic Voltage Scaling
TIDEP0011 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 (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
VQFN (RHL) 14 View options

Ordering & quality

Information included:
  • RoHS
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​