TPS54340 is not recommended for new designs.
This product continues to be in production to support existing customers. Please consider one of these alternatives:
Exact equivalent in functionality and parametrics to the compared device:
TPS54340B ACTIVE 42-V input, 3.5-A, step-down DC/DC converter with Eco-mode™ Pin-compatible with the TPS54340.

Product details


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  • 4.5 V to 42 V (45 V Abs Max) Input Range
  • 3.5 A Continuous Current, 4.5 A Minimum Peak Inductor Current Limit
  • Current Mode Control DC-DC Converter
  • 92-mΩ High-Side MOSFET
  • High Efficiency at Light Loads with Pulse Skipping Eco-mode™
  • Low Dropout at Light Loads with Integrated BOOT Recharge FET
  • 146 µA Operating Quiescent Current
  • 1 µA Shutdown Current
  • 100 kHz to 2.5 MHz Fixed Switching Frequency
  • Synchronizes to External Clock
  • Adjustable UVLO Voltage and Hysteresis
  • Internal Soft-Start
  • Accurate Cycle-by-Cycle Current Limit
  • Thermal, Overvoltage, and Frequency Foldback Protection
  • 0.8 V 1% Internal Voltage Reference
  • 8-Terminal HSOP with PowerPAD™ Package
  • –40°C to 150°C TJ Operating Range
  • Create a Custom Design with WEBENCH Tools

All trademarks are the property of their respective owners.

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The TPS54340 is a 42 V, 3.5 A, step down regulator with an integrated high side MOSFET. The device survives load dump pulses up to 45 V per ISO 7637. Current mode control provides simple external compensation and flexible component selection. A low ripple pulse skip mode reduces the no load supply current to 146 µA. Shutdown supply current is reduced to 1 µA when the enable pin is pulled low.

Undervoltage lockout is internally set at 4.3 V but can be increased using the enable pin. The output voltage start up ramp is internally controlled to provide a controlled start up and eliminate overshoot.

A wide switching frequency range allows either efficiency or external component size to be optimized. Frequency foldback and thermal shutdown protects internal and external components during an overload condition.

The TPS54340 is available in an 8-terminal thermally enhanced HSOP PowerPAD™ package.

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

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 11
Type Title Date
* Datasheet TPS54340 42 V Input, 3.5 A, Step Down DC-DC Converter with Eco-mode™ datasheet (Rev. D) Mar. 20, 2017
Application note NRND & Differences TPS54340/360/540/560 and TPS54340B/360B/540B/560B Apr. 05, 2019
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 Creating a Universal Car Charger for USB Devices From the TPS54240 and TPS2511 (Rev. E) Sep. 16, 2013
User guide Test Report for the iPad Automotive Charger Jun. 11, 2013
User guide Using the TPS54340 Step-Down Converter Evaluation Module (Rev. A) Feb. 12, 2013
Application note Create a Split-Rail Power Supply with a Wide Input Voltage Buck Regulator (Rev. A) Oct. 26, 2012
Application note Create an Inverting Power Supply from a Step-Down Regulator (Rev. B) Oct. 26, 2012
Application note Level Shifting Control for an Inverting Buck-boost Oct. 10, 2012
Application note Creating GSM Power Supply from TPS54260 Apr. 30, 2010

Design & development

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

Hardware development

The Texas Instruments TPS54340EVM-182 evaluation module (EVM) helps designers evaluate the performance of the TPS54340 Step-Down DC/DC Converter. The EVM operates from a 8V to 60V input (12V nominal) and provides a 5.0V output at 3.5A. The EVM demonstrates the small, printed-circuit-board (PCB (...)
  • 8 V to 60 V Input Supply Voltage
  • Integrated 90-mΩ High Side N-Channel MOSFET
  • 146 µA Operating Quiescent Current
  • 1 µA Shutdown Current
  • 100 kHz to 2.5 MHz Switching Frequency
  • Adjustable UVLO Voltage and Hysteresis

Design tools & simulation

SLVM694A.ZIP (111 KB) - PSpice Model
SLVM984.TSC (498 KB) - TINA-TI Reference Design
SLVM985.ZIP (54 KB) - TINA-TI Spice Model
SLVMCT6.ZIP (5 KB) - PSpice 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
  • (...)
SLVC211E.ZIP (522 KB)
SLVC452E.ZIP (245 KB)
SNVC107.PDF (82 KB)

Reference designs

TPA3244 Dolby Atmos Soundbar Reference Design
TIDA-01414 — The TPA3244 Dolby Atmos® Soundbar Reference Design combines Ultra-HD audio and high dynamic range to create room filling audio experience from a small form factor system. The design leverages TI's high-performance TPA3244 amplifier, PCM5252 high-performance DAC with processing, and an integrated (...)
document-generic Schematic
Dual Output Rail Power Supply with Inverting Buck Boost Converter Reference Design
PMP10090 PMP10090.1 shows a power supply, which provides a positive and a negative voltage rail in an inverting Buck Boost configuration. A 12V input is converted to 15V and -15V output voltages with 700mA load current each. 
document-generic Schematic
5V@2.1A USB Charger Automotive Reference Design
PMP10282 This USB 3.0 charger provides 5V @ 2.1A over an automotive input range of 8V - 40V. It uses the integrated FET TPS54340 PWM Buck controller and implements cable voltage droop compensation. A TPS2546 charging port controller provides data line switching plus an integrated FET with dual current (...)
document-generic Schematic
USB-C DFP 5V3A Charger Reference Design
PMP4488 The PMP4488 is low cost 5V3A charger reference design providing Type C DFP feature and is compliant with BC1.2 device.  The design includes a non-synchronous step-down regulator TPS54340 and highly integrated USB type-C controller TPS25810. The PMP4488 demonstrates high efficiency, good (...)
document-generic Schematic
Automotive USB Battery Charging Reference Design
PMP8851 This USB battery charging reference design is optimized for size in order to fit within an automobile power accessory port. The design features a USB dedicated charging port controller with integrated current limiting power switch and a 42V DC/DC converter. High integration and small package sizing (...)
document-generic Schematic
12V input -12V1.5A output Buck-boost inverter
PMP4369 — PMP4369 converts 12V input voltage to negative 12V1.5A output with the high efficiency up to 90%@12Vin. Inverting Buck-Boost topology is adopted and echo mode step down converter TPS54340 is used in the design. The design limited in size within 33mmx33mm. The output ripple & noise is <50mV over (...)
iPad® Automotive Charger Reference Design
TIDA-IPAD-AUTOMOTIVE-CHARGER-REFERENCE-DESIGN The reference design provides customers an extremely small form factor but still compliant to the iPad® charge current requirement of up to 2.1A at 5V. The switching buck, TPS54340, features switching frequency that is up to 2MHz which is above the audio band requirements. Customers can leverage (...)
document-generic Schematic
Design files

CAD/CAE symbols

Package Pins Download
SO PowerPAD (DDA) 8 View options

Ordering & quality

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