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Wide Input (8V-40V) up to 1MHz Frequency Synchronous Buck Controller, source only

TPS40054 is not recommended for new designs
Although this product continues to be in production to support previous designs, we don't recommend it for new designs. Consider one of these alternates:
open-in-new Compare alternates
Same functionality with different pin-out to the compared device
LM25145 ACTIVE 6V to 42V Synchronous Buck DC-DC Controller With Wide Duty Cycle Range This controller provides increased performance.

Product details

Vin (min) (V) 8 Vin (max) (V) 40 Vout (min) (V) 0.7 Vout (max) (V) 35 Iout (max) (A) 20 Iq (typ) (mA) 1.5 Switching frequency (min) (kHz) 100 Switching frequency (max) (kHz) 1000 Features Enable, Frequency synchronization, Synchronous Rectification Operating temperature range (°C) -40 to 85 Regulated outputs (#) 1 Rating Catalog Type Controller
Vin (min) (V) 8 Vin (max) (V) 40 Vout (min) (V) 0.7 Vout (max) (V) 35 Iout (max) (A) 20 Iq (typ) (mA) 1.5 Switching frequency (min) (kHz) 100 Switching frequency (max) (kHz) 1000 Features Enable, Frequency synchronization, Synchronous Rectification Operating temperature range (°C) -40 to 85 Regulated outputs (#) 1 Rating Catalog Type Controller
HTSSOP (PWP) 16 32 mm² 5 x 6.4
  • New products available
    • LM5145 75-V synchronous buck controller with wide input voltage and duty cycle ranges
    • LM5146 100-V synchronous buck DC/DC controller with wide duty-cycle range
  • Operating input voltage 8 V to 40 V
  • Input voltage feedforward compensation
  • < 1% internal 0.7-V reference
  • Programmable fixed-frequency up to 1-MHz voltage mode controller
  • Internal gate-drive outputs for high-side and synchronous N-channel MOSFETs
  • 16-pin PowerPAD™ package (RθJC = 2°C/W)
  • Thermal shutdown
  • Externally synchronizable
  • Programmable high-side sense short-circuit protection
  • Programmable closed-loop soft start
  • TPS40054 source only
  • TPS40055 source and sink
  • TPS40057 source and sink with VO prebias
  • New products available
    • LM5145 75-V synchronous buck controller with wide input voltage and duty cycle ranges
    • LM5146 100-V synchronous buck DC/DC controller with wide duty-cycle range
  • Operating input voltage 8 V to 40 V
  • Input voltage feedforward compensation
  • < 1% internal 0.7-V reference
  • Programmable fixed-frequency up to 1-MHz voltage mode controller
  • Internal gate-drive outputs for high-side and synchronous N-channel MOSFETs
  • 16-pin PowerPAD™ package (RθJC = 2°C/W)
  • Thermal shutdown
  • Externally synchronizable
  • Programmable high-side sense short-circuit protection
  • Programmable closed-loop soft start
  • TPS40054 source only
  • TPS40055 source and sink
  • TPS40057 source and sink with VO prebias

The TPS4005x is a family of high-voltage, wide-input (8 V to 40 V), synchronous, step-down controllers. The TPS4005x family offers design flexibility with a variety of user-programmable functions, including soft start, UVLO, operating frequency, voltage feedforward, high-side current limit, and loop compensation.

The TPS4005x uses voltage feedforward control techniques to provide good line regulation over the wide (4:1) input voltage range, and fast response to input line transients. Near-constant modulator gain with input variation eases loop compensation. The externally programmable current limit provides pulse-by-pulse current limit, as well as hiccup mode operation using an internal fault counter for longer duration overloads.

The new products, LM5145 and LM5146, offer reduced BOM cost, higher efficiency, and reduced solution size among many other features. Start a WEBENCH design with LM5145 and LM5146.

The TPS4005x is a family of high-voltage, wide-input (8 V to 40 V), synchronous, step-down controllers. The TPS4005x family offers design flexibility with a variety of user-programmable functions, including soft start, UVLO, operating frequency, voltage feedforward, high-side current limit, and loop compensation.

The TPS4005x uses voltage feedforward control techniques to provide good line regulation over the wide (4:1) input voltage range, and fast response to input line transients. Near-constant modulator gain with input variation eases loop compensation. The externally programmable current limit provides pulse-by-pulse current limit, as well as hiccup mode operation using an internal fault counter for longer duration overloads.

The new products, LM5145 and LM5146, offer reduced BOM cost, higher efficiency, and reduced solution size among many other features. Start a WEBENCH design with LM5145 and LM5146.

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Technical documentation

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Type Title Date
* Data sheet TPS4005x Wide-Input Synchronous Buck Controller datasheet (Rev. J) PDF | HTML 22 Jun 2022
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note TPS4005x TPS4006x Effect of Programmable UVLO 25 Mar 2004
User guide Using the TPS40055EVM-002 03 Mar 2004
User guide TPS40055 Based Design Converts 12V Bus to 1.8V at 15Amps 06 Feb 2004

Design & development

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

Evaluation board

TPS40055EVM-001 — Evaluation Module Converts 12V Bus to 1.8V at 15 Amps

In many modern electronic applications there is a growing demand for circuits to convert a12-V bus to digital voltages as low as, but not limited to 1.8 V. The current requirements can range from below 1 A to over 15 A. For high-efficiency and small circuit size the TPS40055 wide-input synchronous (...)

User guide: PDF
Not available on TI.com
Evaluation board

TPS40055EVM-002 — Wide Input Range Converter delivers 5V at 2 Amps

The TPS40055EVM−002 wide range input dc-to-dc converter uses the TPS40055 synchronous rectifier controller to step down a 10-V to 40-V input to 5 V. The output current is 3 A with an input of 10 V and should be linearly derated to 2 A at VIN = 40 V. The TPS40055 is used because it offers a variety (...)

User guide: PDF
Not available on TI.com
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
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