4.5V to 28V Input, 3A, Synchronous, Step-Down Converter with Eco-mode


Product details


Vin (Min) (V) 4.5 Vin (Max) (V) 28 Vout (Min) (V) 0.8 Vout (Max) (V) 24 Iout (Max) (A) 3 Iq (Typ) (uA) 600 Switching frequency (Min) (kHz) 50 Switching frequency (Max) (kHz) 1500 Features Enable, Light Load Efficiency, Synchronous Rectification, Soft Start Fixed Operating temperature range (C) -40 to 150 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)


  • Synchronous 128-mΩ and 84-mΩ MOSFETs for
    3-A Continuous Output Current
  • TPS54335A: Internal 2-ms Soft-Start,
    50-kHz to 1.5-MHz Adjustable Frequency
  • TPS54336A: Adjustable Soft-Start,
     Fixed 340-kHz Frequency
  • Low 2-µA Shutdown, Quiescent Current
  • 0.8-V Voltage Reference with ±0.8%
  • Current Mode Control
  • Monotonic Startup into Pre-Biased Outputs
  • Pulse Skipping for Light-Load Efficiency
  • Hiccup Mode Overcurrent Protection
  • Thermal Shutdown (TSD) and
    Overvoltage Transition Protection
  • 8-Pin SO PowerPAD and 10-Pin VSON Packages
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The TPS5433xA family of devices are synchronous converters with an input-voltage range of 4.5 to 28 V. These devices include an integrated low-side switching FET that eliminates the need for an external diode which reduces component count.

Efficiency is maximized through the integrated 128-mΩ and 84-mΩ MOSFETs, low IQ and pulse skipping at light loads. Using the enable pin, the shutdown supply current is reduced to 2 μA. This step-down (buck) converter provides accurate regulation for a variety of loads with a well-regulated voltage reference that is 1.5% over temperature.

Cycle-by-cycle current limiting on the high-side MOSFET protects the TPS5433xA family of devices in overload situations and is enhanced by a low-side sourcing current limit which prevents current runaway. A low-side sinking current-limit turns off the low-side MOSFET to prevent excessive reverse current. Hiccup protection is triggered if the overcurrent condition continues for longer than the preset time. Thermal shutdown disables the device when the die temperature exceeds the threshold and enables the device again after the built-in thermal hiccup time.

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Technical documentation

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Type Title Date
* Data sheet TPS5433xA 4.5-V to 28-V Input, 3-A Output, Synchronous Step-Down DC-DC Converter datasheet (Rev. D) Feb. 10, 2016
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Application note How to Estimate Overshoot and Undershoot of Load Transients of a DC/DC Regulator Dec. 20, 2017
Application note Simplify Voltage and Current Measurement in Battery Test Equipment Oct. 16, 2017
Application note Using TPS54335A to Create an Inverting Power Supply (Rev. A) Jul. 19, 2017
Application note Using TPS54335A to Create an Inverting Power Supply Jul. 13, 2017
User guide TPS54335AEVM-010 3-A Regulator Evaluation Module Jul. 11, 2017

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 TPS54335AEVM-010 is a fully assembled and tested circuit for evaluating the TPS54335A synchronous step-down SWIFT™ converter. The EVM converts a 8-V to 28-V input voltage to a regulated 5-V output voltage that delivers up to 2 A. The TPS54335A enables small designs by integrating the (...)

  • 8-V to 28-V input voltage range
  • 96.5% efficiency (VIN = 8 V, IO = 0.7 A)
  • 0.6-V internal voltage reference
  • 2-μA shutdown quiescent current
  • High efficiency at light loads with pulse-skipping eco-mode
  • Monotonic start-up into pre-biased outputs
  • Synchronous 128-mΩ and 84-mΩ MOSFETs for 3-A (...)

Design tools & simulation

SLVM891A.ZIP (30 KB) - PSpice Model
SLVMAM3A.ZIP (106 KB) - PSpice Model
SLVMAY1.ZIP (7 KB) - TINA-TI Spice Model
SLVMAY2.TSC (377 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
  • (...)

Reference designs

USB Type-C & USB PD Controller Power Switch & High Speed Multiplexer Reference Design
TIDA-00714 The TIDA-00714 TI Design is a complete TPS65982 based reference design for USB Type-C and Power Delivery applications. It allows the user to develop various power profiles and alternate modes such as DisplayPort and debug existing USB Type-C and Power Delivery systems.
document-generic Schematic
Ultra Mobile, Low Power DLP® Pico™ qHD Display Reference Design
TIDA-080002 — The 0.23 qHD DLP chipset is an affordable platform enabling the use of DLP technology with embedded host processor. This chipset is incorporated in to this reference design to enable a low power, on-demand free-form sub-system display for a variety of applications.
document-generic Schematic document-generic User guide
Portable, Low Power HD Display with Increased Brightness Reference Design Using DLP® Technology
TIDA-01571 — This display reference design features the DLP Pico™ 0.3-inch TRP HD 720p display chipset and is implemented in the DLP LightCrafter™ Display 3010-G2 evaluation module (EVM). It enables the use of HD resolution for projection display applications such as mobile smart TV, virtual (...)
document-generic Schematic document-generic User guide
Compact Full HD 1080p (up to 16 Amps) Projection Display Reference Design Using DLP Pico Technology
TIDA-01226 — This reference design, featuring the DLP Pico™ 0.47-inch TRP Full-HD 1080p display chipset and implemented in the DLP LightCrafter Display 4710 G2 evaluation module (EVM), enables use of full HD resolution for projection display applications such as accessory projectors, screenless displays (...)
document-generic Schematic document-generic User guide
12Vin, -5V Output Inverting Buck Boost using Synchronous Step Down Converter Reference Design
PMP20566 — The TPS54335 provides a single IC for both control and the power stage for DC/DC applications up to 3A. PMP20566 utilizes the TPS54335 in an inverting buck boost topology to implement a regulated -5V, rail. TPS54335 enables the designer to implement power solutions which require negative voltages (...)
document-generic Schematic document-generic User guide
8V-20V Input Voltage Synchronous Buck Converter (5V@2A) Reference Design
PMP11225 — The PMP11225 reference design implements two small-footprint integrated FET synchronous buck converters. Optimized for small size, each converter operates at 1.3MHz and occupies an area of only 7mm x 10mm. 
document-generic Schematic document-generic User guide
Primary-Side Regulated Flyback w/85-265VAC Input High Output Energy Storage Reference Design
PMP8930 — The PMP8930 reference design uses the UCC28710 primary-side regulated flyback controller to generate a 20V output from a univeral AC input. a bulk capacitor with slow-charge-fast-discharge circuit is placed at flyback output to provide long hold up time for the following step-down DC-DC stages (...)
Universal uP Controlled Battery Charger 24Vin 10 Aout max, 5/12V 2A & 5V 4A, 2 USB Ports Ref Design
PMP9668 BQ24745 is a host controlled synchronous buck battery charger capable of charging batteries at up to 19.2V and up to 8 A normally, extended to 10 A with use of 8 mOhm battery sense resistor. The power train is capable of 8 A with convection only cooling and 10 A with moderate fan cooling (~200 LFM (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

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

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