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TPS54340B ACTIVE 42-V input, 3.5-A, step-down DC/DC converter with Eco-mode™ Pin-compatible with the TPS54340.

Product details

Vin (Min) (V) 4.5 Vin (Max) (V) 42 Vout (Min) (V) 0.8 Vout (Max) (V) 41 Iout (Max) (A) 3.5 Iq (Typ) (uA) 146 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 2500 Features Enable, Frequency Synchronization, Light Load Efficiency, Over Current Protection, UVLO Adjustable Rating Catalog Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 98
Vin (Min) (V) 4.5 Vin (Max) (V) 42 Vout (Min) (V) 0.8 Vout (Max) (V) 41 Iout (Max) (A) 3.5 Iq (Typ) (uA) 146 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 2500 Features Enable, Frequency Synchronization, Light Load Efficiency, Over Current Protection, UVLO Adjustable Rating Catalog Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 98
HSOIC (DDA) 8 19 mm² 4.9 x 3.9
  • 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
  • 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

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.

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.

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Technical documentation

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Type Title Date
* Data sheet TPS54340 42 V Input, 3.5 A, Step Down DC-DC Converter with Eco-mode™ datasheet (Rev. D) PDF | HTML 20 Mar 2017
Application note NRND & Differences TPS54340/360/540/560 and TPS54340B/360B/540B/560B 05 Apr 2019
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note Creating a Universal Car Charger for USB Devices From the TPS54240 and TPS2511 (Rev. E) 16 Sep 2013
Test report Test Report for the iPad Automotive Charger 11 Jun 2013
EVM User's guide Using the TPS54340 Step-Down Converter Evaluation Module (Rev. A) 12 Feb 2013
Application note Create a Split-Rail Power Supply with a Wide Input Voltage Buck Regulator (Rev. A) 26 Oct 2012
Application note Create an Inverting Power Supply from a Step-Down Regulator (Rev. B) 26 Oct 2012
Application note Level Shifting Control for an Inverting Buck-boost 10 Oct 2012
Application note Creating GSM Power Supply from TPS54260 30 Apr 2010

Design & development

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

Evaluation board

TPS54340EVM-182 — TPS54340 Step-Down Converter Evaluation Module

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) (...)
User guide: PDF
Not available on TI.com
Simulation model

TPS54340 PSpice Transient Model (Rev. A)

SLVM694A.ZIP (111 KB) - PSpice Model
Simulation model

TPS54340 TINA-TI Transient Reference Design

SLVM984.TSC (498 KB) - TINA-TI Reference Design
Simulation model

TPS54340 TINA-TI Transient Spice Model

SLVM985.ZIP (54 KB) - TINA-TI Spice Model
Simulation model

TPS54340 Unencrypted PSpice Transient Model

SLVMCT6.ZIP (5 KB) - PSpice Model
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 (...)
Reference designs

TIDA-01414 — TPA3244 Dolby Atmos Soundbar Reference Design

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 (...)
Design guide: PDF
Schematic: PDF
Reference designs

PMP10090 — Dual Output Rail Power Supply with Inverting Buck Boost Converter Reference Design

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. 
Test report: PDF
Schematic: PDF
Reference designs

PMP10282 — 5V@2.1A USB Charger Automotive Reference Design

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 (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP4488 — USB-C DFP 5V3A Charger Reference Design

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 (...)
Test report: PDF
Schematic: PDF
Reference designs

PMP8851 — Automotive USB Battery Charging Reference Design

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 (...)
Test report: PDF
Schematic: PDF
Reference designs

TIDA-IPAD-AUTOMOTIVE-CHARGER-REFERENCE-DESIGN — 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 (...)
Test report: PDF
Schematic: PDF
Package Pins Download
SO PowerPAD (DDA) 8 View options

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