Step-down (buck) regulators

Efficient conversion of an input voltage to a lower output voltage

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With over 1000 unique devices, you can select from the industry’s most comprehensive portfolio of high-efficiency DC/DC step-down (buck) switching regulators. This extensive family of products includes all types of step-down switching regulators, ranging from the flexibility of a controller IC to the high-integration and simplicity of a buck power module. From a 1-V to 100-V input and 50-mA to 420-A output, you can count on us to have a step-down voltage regulator that meets your system’s requirements.

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LMR38020-Q1 NEW

Automotive SIMPLE SWITCHER® power converter 4.2-V to 80-V, 2-A, synchronous buck converter

Approx. price (USD) 1ku | 1.475
LM5149-Q1 NEW

80-V automotive synchronous buck DC/DC controller with ultra-low IQ and integrated active EMI filter

Approx. price (USD) 1ku | 2.189

17-VIN, 3-A low-noise and low-ripple buck module with integrated ferrite bead filter compensation

Approx. price (USD) 1ku | 3
TPS562242 NEW

3-V to 16-V input voltage, 2-A, 1.4-MHz synchronous buck converter in SOT563

Approx. price (USD) 1ku | 0.175

2.75-V to 6-V, 6-A step-down module with adjustable-frequency & tracking in 3 x 4-mm QFN

Approx. price (USD) 1ku | 2.05

12-phase, step-down, digital multiphase controller with SVI3 and PMBus for AMD platform

Approx. price (USD) 1ku | 7.7

Power trends

Power density

More power, less board space. This is the trend in applications across all markets as well as the our step-down regulator portfolio. Highlighted by the SWIFT™ buck regulator family, our portfolio of high-power density devices are highly integrated, with high performance feature sets and high output-current capability in compact, thermally-enhanced packaging.

High-density power modules are a great choice for powering high-current digital loads like FPGAs and processors. Use our processor-attach tool to find the best power supply devices to surround your FPGA or processor. 

White paper
Enabling Small, Cool and Quiet Power Modules with Enhanced HotRod™ QFN Packaging
Learn how our enhanced HotRod™ QFN package technology enables engineers to address design challenges and take advantage of more efficient, cooler and quieter devices in their designs. 
Application note
Thermal Comparison of a DC-DC Converter in SOT23 and the New SOT563 (Rev. A)
This application note compares the thermal performance of flip-chip on lead (FCOL) SOT-563 packages with the conventional wire-bond SOT-23 packages and FCOL SOT-23 packages. 
Leverage TI’s online toolbox to tackle thermals before touching a soldering iron
For every 10° in junction temperature rise, the chances of your IC failing doubles. In this training, learn how to optimize your switching regulator design for thermal performance and ensure long-term system reliability.
Featured products for power density
TPS543620 ACTIVE 4-V to 18-V input, advanced current mode, 6-A synchronous SWIFT™ step-down converter
TPSM63603 ACTIVE High-density, 3-V to 36-V input, 1-V to 16-V output, 3-A power module
TPSM82823 ACTIVE 5.5-V input, 3-A step-down module with integrated inductor in 2.0-mm × 2.5-mm × 1.1-mm uSiP package

Mitigating buck regulator EMI can be a major challenge for many power-supply designers. Devices with built-in EMI-reduction technologies save design time while helping you comply with difficult standards such as CISPR 25 Class-5. Check out our featured step-down regulators for EMI performance. 

Reducing filter size and cost with an active EMI filter
See how the power of integration can not only reduce your filter size and volume, but cost and EMI. This video explains our integrated active EMI filtering technology (AEF), and how it can be used to reduce power supply size.
White paper
Simplify low EMI design with power modules
Learn how the tight integration of a power module helps to not only increase power density, but also simplify EMI design. 
Leverage TI’s online toolbox to tackle EMI before touching a soldering iron
In this training you will learn what is EMI, how to optimize layout for EMI using the data sheet, and the impact of an input filter on conducted emissions. 
Featured products for low EMI
TPS62810-Q1 ACTIVE Automotive 2.75-V to 6-V, 4-A step-down converter in a 2mm x 3mm wettable-flanks QFN package
LM25149 ACTIVE 42-V synchronous buck DC/DC controller with ultra-low IQ and integrated active EMI filter
LMQ61460-Q1 ACTIVE Automotive 3-V to 36-V, 6-A low EMI synchronous step-down quiet converter with integrated capacitors
Low quiescent current (IQ)

DC/DC step-down regulators with ultra-low standby quiescent current increase light-load efficiency and extend battery life in portable and battery-operated applications. Find some of the lowest IQ devices in our buck regulator portfolio below.

Analog Design Journal
IQ: What it is, what it isn’t, and how to use it
This article defines IQ and how it is measured and gives design considerations on how to use IQ while avoiding common measurement errors. 
IQ (quiescent current) and light-load efficiency
Learn how to leverage pulse frequency modulation (PFM) to achieve high light-load efficiency with a DC/DC converter.
White paper
Demystifying Input Supply Current in DC/DC Regulators:From Shutdown to Full Load
This paper helps clear up some of the confusion surrounding quiescent current by focusing on the current required from the input supply flowing into a buck regulator, rather than getting caught up in the terminology.
Featured products for low quiescent current (IQ)
TPS62840 ACTIVE 60-nA quiescent current (IQ), 1.8-V to 6.5-VIN, high-efficiency 750-mA step-down converter
LMR43620-Q1 ACTIVE Automotive 3-V to 36-V, 2-A, low-IQ synchronous buck regulator
LM25149-Q1 PREVIEW 42-V automotive synchronous buck DC/DC controller with ultra-low IQ and integrated active EMI filter
Low noise & precision

Typical switching regulators require a post-regulator LDO to power high-resolution ADCs and AFEs. But with the industry's best noise and ripple performance, TPS62912 and TPS62913 allow you to remove that low-noise LDO in most applications, saving PCB area and overall cost while improving system efficiency. 

Achieve low noise and low output ripple with a high-efficiency DC/DC converter
The TPS62913 is the industry's first buck converter can achieve 20-μVRMS output noise without a post-regulator LDO. Learn how integrated ferrite-bead compensation can reduce size and cost while improving efficiency.
Application note
Powering Sensitive Noise ADC Designs with the TPS62913 Low-Noise Buck Converter
This power supply design demonstrates a simplified and efficient implementation of the TPS62913 low-ripple and low-noise buck converter to power an ADC without a post-regulator LDO, reducing power consumption by 15%.
Technical article
Understanding and managing buck regulator output ripple
By choosing the right external passives and making some careful decisions on layout, you can still achieve a tiny, cost-effective solution and optimize the output ripple for your application.
Featured products for low noise & precision
TPS62912 ACTIVE 17-VIN, 2-A low-noise and low-ripple buck converter with integrated ferrite bead filter compensation
TPS62913 ACTIVE 17-VIN, 3-A low-noise and low-ripple buck converter with integrated ferrite bead filter compensation

Design & development resources

Design tool
WEBENCH® Power Designer
WEBENCH® Power Designer creates customized power-supply circuits based on your requirements. The environment gives you end-to-end power-supply design capabilities that save you time during all phases of the design process.
Simulation tool
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 (...)
Design tool
Power Stage Designer™ Tool of Most Commonly Used Switch-mode Power Supplies
Power Stage DesignerTM is a JAVA-based tool (requires JAVA 8 or OpenJDK 8) that helps engineers accelerate their power-supply designs by calculating voltages and currents of 20 topologies according to the user’s inputs. Additionally, Power Stage Designer contains a Bode plotting tool and a (...)

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