Product details

Vin (Min) (V) 3.5 Vin (Max) (V) 42 Vout (Min) (V) 0.8 Vout (Max) (V) 39 Iout (Max) (A) 0.5 Iq (Typ) (uA) 116 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 2500 Features Enable, Frequency Synchronization, Light Load Efficiency, Over Current Protection, Power Good, Tracking, UVLO Adjustable Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1
Vin (Min) (V) 3.5 Vin (Max) (V) 42 Vout (Min) (V) 0.8 Vout (Max) (V) 39 Iout (Max) (A) 0.5 Iq (Typ) (uA) 116 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 2500 Features Enable, Frequency Synchronization, Light Load Efficiency, Over Current Protection, Power Good, Tracking, UVLO Adjustable Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1
HVSSOP (DGQ) 10 9 mm² 3 x 3 VSON (DRC) 10 9 mm² 3 x 3
  • 3.5 V to 42 V Input Voltage Range
  • 200-mΩ High-Side MOSFET
  • High Efficiency at Light Loads with a Pulse
    Skipping Eco-mode™
  • Tighter Enable Threshold than TPS54040
    for More Accurate UVLO Voltage
  • Adjustable UVLO Voltage and Hysteresis
  • 116 µA Operating Quiescent Current
  • 1.3 µA Shutdown Current
  • 100 kHz to 2.5 MHz Switching Frequency
  • Synchronizes to External Clock
  • Adjustable Slow Start/Sequencing
  • UV and OV Power Good Output
  • 0.8-V Internal Voltage Reference
  • Available in MSOP-10 and VSON-10 Packages
  • Supported by WEBENCH® and SwitcherPro™
    Software Tool
  • 3.5 V to 42 V Input Voltage Range
  • 200-mΩ High-Side MOSFET
  • High Efficiency at Light Loads with a Pulse
    Skipping Eco-mode™
  • Tighter Enable Threshold than TPS54040
    for More Accurate UVLO Voltage
  • Adjustable UVLO Voltage and Hysteresis
  • 116 µA Operating Quiescent Current
  • 1.3 µA Shutdown Current
  • 100 kHz to 2.5 MHz Switching Frequency
  • Synchronizes to External Clock
  • Adjustable Slow Start/Sequencing
  • UV and OV Power Good Output
  • 0.8-V Internal Voltage Reference
  • Available in MSOP-10 and VSON-10 Packages
  • Supported by WEBENCH® and SwitcherPro™
    Software Tool

The TPS54040A device is a 42 V, 0.5 A, step down regulator with an integrated high side MOSFET. Current mode control provides simple external compensation and flexible component selection. A low ripple pulse skip mode reduces the no load, regulated input supply current to 116 µA. Using the enable pin, shutdown supply current is nominally 1.3 µA when the enable pin is low.

Under voltage lockout is internally set at 2.5 V, but can be increased using the enable pin. The output voltage startup ramp is controlled by the slow start pin that can also be configured for sequencing or tracking. An open drain power good signal indicates when the output is within 94% to 107% of its nominal voltage.

A wide switching frequency range allows efficiency and external component size to be optimized. Frequency fold back and thermal shutdown protects the part during an overload condition.

The TPS54040A device is a 42 V, 0.5 A, step down regulator with an integrated high side MOSFET. Current mode control provides simple external compensation and flexible component selection. A low ripple pulse skip mode reduces the no load, regulated input supply current to 116 µA. Using the enable pin, shutdown supply current is nominally 1.3 µA when the enable pin is low.

Under voltage lockout is internally set at 2.5 V, but can be increased using the enable pin. The output voltage startup ramp is controlled by the slow start pin that can also be configured for sequencing or tracking. An open drain power good signal indicates when the output is within 94% to 107% of its nominal voltage.

A wide switching frequency range allows efficiency and external component size to be optimized. Frequency fold back and thermal shutdown protects the part during an overload condition.

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Technical documentation

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Type Title Date
* Data sheet TPS54040A 0.5-A, 42-V Step-Down DC-DC Converter With Eco-Mode™ datasheet (Rev. B) 15 Jan 2016
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
Technical article Designing an EMC-compliant interface to motor position encoders – Part 5 10 Nov 2015
Application note Design Considerations for DC-DC Converters in Fast-Input Slew Rate Applications 05 Mar 2015
Application note Methods to Improve Low Dropout Operation with the TPS54240 and TPS54260 (Rev. A) 06 Nov 2013
Application note Differences between the TPS54x40, TPS54x60 and the TPS54x40A, TPS54x60A 17 Apr 2013
Application note Level Shifting Control for an Inverting Buck-boost 10 Oct 2012

Design & development

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

Evaluation board

TPS54040EVM-456 — TPS54040 42V Input, 5V Output, 0.5A Evaluation Module

The TPS54040EVM-456 evaluation module is designed to demonstrate the small printed-circuit-board areas that can be achieved when designing with the TPS54040 regulator. The TPS54040 dc/dc converter is designed to provide up to a 0.5-A output from an input voltage source of 3.5 V to 42 V. Rated input (...)
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Simulation model

TPS54040 PSpice Transient Model

SLIM069.ZIP (66 KB) - PSpice Model
Simulation model

TPS54040 TINA-TI Transient Spice Model

SLIM277.ZIP (68 KB) - TINA-TI Spice Model
Simulation model

TPS54040 TINA-TI Transient Reference Design

SLIM278.TSC (482 KB) - TINA-TI Reference Design
Simulation model

TPS54040A Unencrypted PSpice Average Model Package (Rev. A)

SLVM914A.ZIP (96 KB) - PSpice Model
Simulation model

TPS54040A Unencrypted PSpice Average Model

SLVMCU5.ZIP (1 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-01574 — Power Stage Reference Design for Power Stealing Thermostat

TIDA-01574 is a reference design for high-efficiency power stealing for smart thermostats and other building automation equipment. In general, power stealing enables to extend battery life of Wi-Fi enabled smart thermostats by drawing power from 24-V AC when the HVAC load is off. This power-stealing (...)
Reference designs

PMP11791 — TPS54040A Inverting Buck/Boost Reference Design

This reference design operates within 12-V to 20-V input voltage and delivers -14 V/200 mA at the output.
Reference designs

TIDA-00176 — Interface to Sin/Cos Encoders with High-Resolution Position Interpolation Reference Design

The TIDA-00176 reference design is an EMC compliant industrial interface to Sin/Cos position encoders. Applications include industrial drives, which require accurate speed and position control.
The design utilizes a 16-bit dual sample ADC with drop-in compatible 14- or 12-bit versions available (...)
Reference designs

TIDA-00180 — Power Supply with Programmable Output Voltage and Protection for Position Encoder Interfaces

This reference design implements a universal power supply with programmable output voltage and innovative smart eFuse technology for use in a multi-standard position encoder interface module on an industrial drive. The eFuse provides inrush-current and over-current protection as well as user (...)
Reference designs

TIDA-00175 — Interface to a 5-V BiSS position encoder reference design

This reference design implements a hardware interface based on the BiSS standard for position or rotary encoders. It supports both BiSS point-to-point and BiSS bus configurations. The building blocks include the power supply for a 5-V BiSS encoder with innovative smart eFuse technology and robust (...)
Reference designs

TIDA-00172 — Reference Design for an Interface to a Position Encoder with EnDat 2.2

This reference design implements a hardware interface based on the HEIDENHAIN EnDat 2.2 standard for position or rotary encoders. The building blocks include the power supply for the encoder with innovative smart eFuse technology and robust half-duplex RS-485 transceivers including line termination (...)
Reference designs

PMP8715 — 9 to 14Vin 3.3V/0.3A Buck Conv Ceramic Output Capacitor Switching @ 398kHz Reference Design

This design is a buck converter for automotive as well as for non-automotive applications. It delivers an output voltage of 3.3V @ 0.3A at an input voltage range of 9-14V. It can withstand input peaks up to 40V.
Package Pins Download
HVSSOP (DGQ) 10 View options
VSON (DRC) 10 View options

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