4.5V to 20V Input, 3A Synchronous Step-Down Converter with Low-Side Gate Driver


Product details


Vin (Min) (V) 4.5 Vin (Max) (V) 20 Vout (Min) (V) 0.9 Vout (Max) (V) 12 Iout (Max) (A) 3 Iq (Typ) (uA) 5000 Switching frequency (Min) (kHz) 250 Switching frequency (Max) (kHz) 700 Features Enable, Frequency Synchronization, Phase Interleaving, Power Good, Synchronous Rectification Operating temperature range (C) -40 to 150 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

HTSSOP (PWP) 16 32 mm² 5 x 6.4 open-in-new Find other Buck converters (integrated switch)


  • 100 m, 4.5-A Peak MOSFET Switch for High Efficiency at 3-A Continuous Output Current
  • Uses External Lowside MOSFET or Diode
  • Output Voltage Adjustable Down to 0.891 V With 1% Accuracy
  • Synchronizes to External Clock
  • 180° Out of Phase Synchronization
  • Wide PWM Frequency – Fixed 250 kHz, 500 kHz or Adjustable 250 kHz to 700 kHz
  • Internal Slow Start
  • Load Protected by Peak Current Limit and Thermal Shutdown
  • Adjustable Undervoltage Lockout
  • 16-Pin TSSOP PowerPAD™ Package
    • Industrial & Commercial Low Power Systems
    • LCD Monitors and TVs
    • Computer Peripherals
    • Point of Load Regulation for High Performance DSPs, FPGAs, ASICs and Microprocessors

PowerPAD and SWIFT are trademarks of Texas Instruments.

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The TPS54350 is a medium output current synchronous buck PWM converter with an integrated high side MOSFET and a gate driver for an optional low side external MOSFET. Features include a high performance voltage error amplifier that enables maximum performance under transient conditions and flexibility in choosing the output filter inductors and capacitors. The TPS54350 has an under-voltage-lockout circuit to prevent start-up until the input voltage reaches 4.5 V; an internal slow-start circuit to limit in-rush currents; and a power good output to indicate valid output conditions. The synchronization feature is configurable as either an input or an output for easy 180° out of phase synchronization.

The TPS54350 device is available in a thermally enhanced 16-pin TSSOP (PWP) PowerPAD™ package. TI provides evaluation modules and the SWIFT™ Designer software tool to aid in quickly achieving high-performance power supply designs to meet aggressive equipment development cycles.

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TPS54325 ACTIVE 4.5V to 18V Input, 3A Synchronous Step-Down Converter This is a synchronous product.

Technical documentation

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Type Title Date
* Datasheet 4.5V to 20V Input, 3-A Output Synchronous PWM Switcher w/Integrated FET (SWIFT) datasheet (Rev. C) Oct. 28, 2004
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
User guide TPS54350EVM-235 3-Amp Swift Regulator EVM (Rev. A) Apr. 14, 2004
Application note Seminar 900 Topic 2 - Snubber Circuits: Theory, Design and Application Feb. 15, 2001

Design & development

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Hardware development

document-generic User guide
  • External compensation for design flexibility
  • 90% efficiency
  • 1% regulation
  • 30 mV output ripple voltage
  • Uses optional low-side MOSFET for high efficiency synchronous rectification
  • Supported by SWIFT Designer software tool for quick and easy design

Design tools & simulation

SLVM337A.ZIP (43 KB) - PSpice Model
SLVM745.TSC (400 KB) - TINA-TI Reference Design
SLVM746.ZIP (56 KB) - TINA-TI Spice Model
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
  • (...)
SLVC041.ZIP (106 KB)
SLVC042.ZIP (157 KB)

Reference designs

Multiphase, Sync Buck, Buck-Boost, Boost for IP Converter (25V @ 1A)
PMP3061 — PMP3061 is a multiple output power supply that supports a number of different rails. The input for this design is 12V with the following devices and outputs TPS40140 (1.2V@40A), TPS40190 (3.3V@6A), TPS54350 (-5V@200mA), TPS40210 (25V@1A), TPS5430 (-12V@200mA). The supply has a range of topologies (...)
Design files

CAD/CAE symbols

Package Pins Download
HTSSOP (PWP) 16 View options

Ordering & quality

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