TPS54340-Q1 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-Q1 ACTIVE Automotive, 4.5V to 42V Input, 3.5A Step-Down Converter With Eco-Mode™ Pin-compatible with the TPS54340-Q1.

Product details


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  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C
      Ambient Operating Temperature Range
    • Device HBM ESD Classification Level H1C
    • Device CDM ESD Classification Level C3B
  • High Efficiency at Light Loads With Pulse Skipping
  • 92-mΩ High-Side MOSFET
  • 146-µA Operating Quiescent Current and 2-µA
    Shutdown Current
  • 100-kHz to 2.5-MHz Adjustable Switching
  • Synchronizes to External Clock
  • Low Dropout at Light Loads With Integrated
    BOOT Recharge FET
  • Adjustable UVLO Voltage and Hysteresis
  • 0.8 V 1% Internal Voltage Reference
  • 8-Pin HSOIC With PowerPAD™ Package
  • –40°C to 150°C TJ Operating Range
  • Supported by WEBENCH® Software Tool
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The TPS54340-Q1 device 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 an external resistor divider at the enable pin. The output voltage start-up ramp is internally controlled to provide a controlled start-up and eliminate overshoot.

A wide adjustable frequency range allows for optimization of either efficiency or external component size. Frequency foldback and thermal shutdown protects internal and external components during an overload condition.

The TPS54340-Q1 device is available in an 8-pin thermally-enhanced HSOIC PowerPAD package.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 5
Type Title Date
* Datasheet TPS54340-Q1 4.5-V to 42-V Input, 3.5-A, Step-Down DC-DC Converter With Eco-Mode™ datasheet (Rev. A) Nov. 16, 2015
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 Automotive Infotainment EE Buck Converter/Controller Selection Guide (Rev. A) Jan. 15, 2019
User guide Evaluation Module for the TPS54340-Q1 Step-Down Converter Sep. 24, 2013

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 TPS54340-Q1EVM-593 is a fully assembled and tested circuit for evaluating the TPS54340-Q1 Step-Down Converter. The TPS54340-Q1EVM-593 operates from a 7V to 42V input (12V nominal) and provides a 5V output at 3.5A. Additional input filtering is used for reducing conducted emissions.


4.5 V to 42 V Input Supply Voltage

Integrated 90-mΩ High Side N-Channel MOSFET

146 µA Operating Quiescent Current

2 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
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
  • (...)

Reference designs

Automotive USB Charger with Integrated Linear Droop Compensation Reference Design
PMP4471 The PMP4471 reference design provides detailed data for evaluating and verifying a USB charger, which uses a USB charge controller and a buck converter .  The design is capable of compensating for the effects on Vdroop when a smartphone / tablet is connected to the USB charger using a cable (...)
document-generic Schematic document-generic User guide
Automotive USB Charger with Linear Droop Compensation Reference Design
PMP4425 The PMP4425 reference design provides detailed data for evaluating and verifying a USB charger, which uses a USB charge controller, a buck converter and a shunt amplifier. Additionally the design demonstrates an automotive USB charging port that offers short-to-battery protection. With the help of (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
SO PowerPAD (DDA) 8 View options

Ordering & quality

Information included:
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  • MSL rating/Peak reflow
  • MTBF/FIT estimates
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  • Qualification summary
  • Ongoing reliability monitoring

Support & training

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