TPS54540-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:
TPS54540B-Q1 ACTIVE 4.5-V to 42-V input, 5-A, step-down DC-DC converter with Eco-mode™ Pin-compatible with the TPS54540-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 Eco-mode™
  • 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 HSOP PowerPAD™ Package
  • –40°C to 150°C TJ Operating Range
  • Supported by WEBENCH® Software Tool
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The TPS54540-Q1 device is a 42-V, 5-A, step-down regulator with an integrated high-side MOSFET. The device survives load-dump pulses up to 65 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 2 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 either efficiency or external component size to be optimized. Output current is limited cycle-by-cycle. Frequency foldback and thermal shutdown protect internal and external components during an overload condition.

The TPS54540-Q1 is available in an 8-pin thermally-enhanced HSOP PowerPAD package.

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Technical documentation

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View all 5
Type Title Date
* Datasheet TPS54540-Q1 4.5-V to 42-V Input, 5-A, Step-Down DC-DC Converter With Eco-mode™ datasheet (Rev. B) Nov. 25, 2015
Selection guide Automotive Infotainment EE Buck Converter/Controller Selection Guide (Rev. B) Apr. 15, 2021
Application note NRND & Differences TPS54340/360/540/560 and TPS54340B/360B/540B/560B Apr. 05, 2019
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
User guide Evaluation Module for the TPS54540-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 TPS54540-Q1EVM-593 is a fully assembled and tested circuit for evaluating the automotive qualified TPS54540-Q1 step-down converter. The TPS54540-Q1EVM-593 operates from a 7V to 42V input (12V nominal) and provides a 5V output at 5A. Additional input filtering is used for reducing conducted (...)

  • 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

SLVM871A.ZIP (125 KB) - PSpice Model
SLVMA28A.ZIP (205 KB) - PSpice Model
SLVMCT8.ZIP (6 KB) - PSpice Model
SLVMCT9.ZIP (1 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 Wide Vin Front-End Power Reference Design w/Cold Crank Operation & Transient Protection
TIDA-01179 The TIDA-01179 reference design is an automotive front-end power supply that is able to supply 30W maximum output for the 12V car battery. The first stage is a buck-boost DC/DC converter that maintains a stable 15V output voltage over the full DC range of the 12V battery conditions specified in ISO (...)
document-generic Schematic document-generic User guide
Wide input voltage buck converter solution optimized for large load steps
PMP8726 This design is a non-synchronous buck converter with an input voltage range of 16 to 42V providing 14V output at 5A. It is optimized for large load steps. The IC has a Q-grade option for automotive applications.
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
SO PowerPAD (DDA) 8 View options

Ordering & quality

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Support & training

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