Lower system costs and quickly meet EMI standards by reducing emissions

What features reduce EMI across high and low frequencies?

Electromagnetic interference (EMI) is a key requirement of increasing importance in electronic systems, especially in new automotive and industrial applications. Designing for low EMI can save you significant development cycle times while also reducing board area and solution cost. TI offers multiple features and technologies to mitigate EMI in all of the frequency bands of interest.

Time-Saving and Cost-Effective Innovations for EMI Reduction in Power Supplies

As electronic systems become increasingly dense and interconnected, reducing the effects of EMI becomes an increasingly critical system design consideration. In this paper, we examine EMI in switch-mode power supplies, and provide technology examples to help you quickly and easily pass industry-standard EMI tests.

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Benefits of TI technologies for low EMI


Improved filter size & cost

Advanced spread-spectrum and active EMI suppression techniques reduces the impact of generated EMI.


Reduced design time & complexity

Flip-chip packaging, capacitor integration and advanced gate-driver techniques fundamentally reduce generated noise at the source.

Designing a low EMI power supply

EMI design can be challenging, but we’re here to help. This comprehensive training series shows you an easier path to designing an efficient power supply that meets conducted and radiated EMI requirements.

Watch the video series
An Engineer’s Guide to Low EMI in DC/DC Regulators

An overview of EMI management and mitigation techniques for DC/DC regulators

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Featured low-EMI products

AC/DC & DC/DC controllers (external FET) LM25149 ACTIVE 42-V synchronous buck DC/DC controller with ultra-low IQ and integrated active EMI filter
USB Type-C & USB Power Delivery ICs TPS25850-Q1 ACTIVE 2.2-MHz, low-EMI, dual, 3-A USB Type-C charging ports converter with thermal management
Isolated power modules (integrated transformer) UCC14240-Q1 ACTIVE Automotive, 2.0-W, 24-Vin, 25-Vout high-density > 3-kVRMS isolated DC/DC module
AC/DC & DC/DC converters (integrated FET) LMQ66430 ACTIVE 36-V, 3-A low-EMI synchronous step-down converter with 1.5-µA IQ
Power-supply filter ICs TPSF12C1-Q1 ACTIVE Automotive common-mode active EMI filter (AEF) for single-phase systems
Power-supply filter ICs TPSF12C3-Q1 ACTIVE Automotive common-mode active EMI filter (AEF) for three-phase systems

Featured reference designs for low EMI

Reference design
Isolated 5-V bias supply for automotive CISPR 25, class 5 emissions, reference design
This reference design demonstrates EMI mitigation techniques required for a high frequency, reinforced 5-kVRMS isolated, 5-V bias DC/DC converter module to pass the automotive, CIPSR 25, class 5, EMC test standard. The design features a 500-mW, high efficiency bias supply with integrated (...)
Reference design
CISPR 25 Class-5 2.2-MHz rated 30-W automotive dual USB Type-C® charger reference design
This reference design is an EMI-optimized design for automotive USB Type-C®  charger with dual 15-W output. The TPS25850-Q1 is used as DC/DC regulator and port controller. The switching frequency is 2.2 MHz. The front-end filter is designed and PCB layout is optimized to pass stringent CISPR (...)
Reference design
3.3V 1A, Low EMI, 92% Efficiency DC/DC Module in Single Layer TO-247 Form Factor Reference Design
This reference design demonstrates a 15 mm x 20 mm, 92% efficiency, low electromagnetic interference (EMI) DC/DC module with TPS54202, replacing low dropout regulator (LDO) in major home appliance applications. The high efficiency eliminates the need of heat sink for a smaller and cheaper (...)

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