Calculation tool
Data sheet
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TPS54040A
- 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.
Technical documentation
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View all 7 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | TPS54040A 0.5-A, 42-V Step-Down DC-DC Converter With Eco-Mode™ datasheet (Rev. B) | PDF | HTML | 15 Jan 2016 |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| Technical article | Designing an EMC-compliant interface to motor position encoders – Part 5 | PDF | HTML | 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 (...)
User guide: PDF
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
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
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, (...)
The design utilizes a 16-bit dual sample ADC with drop-in compatible 14- or 12-bit versions available, (...)
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-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 (...)
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 (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HVSSOP (DGQ) | 10 | Ultra Librarian |
| VSON (DRC) | 10 | Ultra Librarian |
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Support & training
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