LARGE VALUE X2Y® IN DC-DC CONVERTERS All commonly deployed DC-DC converter topologies:  Buck, boost, flyback, SEPIC (Cuk topology is rare) have at least one switched port. Parasitic capacitance across filter inductors passes high frequency switching noise to filtered ports HF noise propagation through filtered and switched ports is proportional to filter capacitor mounted ESL at each. The unique construction of X2Y ® capacitors results in essentially constant mounted ESL in larger body parts such as 1206, as in smaller body parts such as  Enables massive improvement in filter performance w/o extra magnetics 10/5/2015© X2Y Attenuators, LLC1

LARGE BODY X2Y® IN DC-DC CONVERTERS Example 1206 body part uStrip configuration, mounted ESL < 40pH > 25:1 HF noise attenuation versus well- mounted nH 10/5/2015© X2Y Attenuators, LLC2 X2Y 1206 size on microstrip |S21| Transfer Impedance, 1206 Size X2Y ®

Microstrip Filter Performance 10/5/2015Confidential © X2Y Attenuators, LLC3 1- X2Y 2-X2Ys

10/5/2015© X2Y Attenuators, LLC4 DC-DC Converters X2Y ® Low ESL attenuates HF spikes at both input and output nodes for all common topologies:  Buck  Boost  Flyback  SEPIC

10/5/2015© X2Y Attenuators, LLC5 DC-DC Converters Filter parasitics pass HF noise often 200MHz or more to output Solutions:  Add series filters Cost Space DC drop  Reduce filter capacitor inductance Conventional 1206 caps > 1nH ESL X2Y ® 1206 caps, very low mounted ESL: pH  10X – 25X+ better than conventional 1206  Value depends on mounting configuration

10/5/2015© X2Y Attenuators, LLC6 DC-DC Converters X2Y® low ESL shunts HF noise:  Noise “Brick Wall”  Reduced EMI from converter into application PCB  Reduced EMI from application PCB conducted back through converter No extra magnetics  Reduces cost for performance  Saves space  No extra DC drop

10/5/2015© X2Y Attenuators, LLC7 Example Buck DC-DC Converters Input Filter X2Y ® Location

10/5/2015© X2Y Attenuators, LLC8 DC-DC Radiated Emissions from DC Feed DC-DC Converters

Design Assistance X2Y provides design assistance: Application specific support Whole product circuit recommendations for IC bypass / EMI filtering, to maximize component reduction and performance Models, simulations, documentation 10/5/2015© X2Y Attenuators, LLC9