Title :
Evaluation of LTCC capacitors and inductors in DC/DC converters
Author :
Laili Wang ; Yunqing Pei ; Xu Yang ; Bo Song ; Zhaoan Wang ; Guopeng Zhao
Author_Institution :
Electr. Eng. Dept., Xi´an Jiaotong Univ., Xi´an, China
Abstract :
Low temperature co-fired ceramic (LTCC) technology has been proved to be an effective way to realize system integration. By using this technology, passive components in a DC/DC converter could be integrated into a passive substrate. This paper presents fabrication and evaluation of LTCC capacitors and inductors and summarizes challenges of applying LTCC technology to DC/DC converters. Four capacitors are made; two of them are made with single layer high permittivity thick film paste, and maximum 1.1 ¿F capacitance is obtained; the other two are made with multilayer low permittivity LTCC tapes, maximum 30 nF capacitance is obtained. A 70 nH LTCC inductor is also fabricated with ferrite tapes. It is tested in a 1.2 MHz buck converter and a 30 MHz class ¿2 DC/DC converter. Finally, challenges of conductor resistance, capacitor tape permittivity, and shrinkage matching are discussed and summarized.
Keywords :
DC-DC power convertors; ceramic capacitors; inductors; DC/DC converters; LTCC capacitors; capacitor tape permittivity; conductor resistance; multilayer low permittivity LTCC tapes; shrinkage matching; single layer high permittivity thick film paste; Capacitance; Capacitors; Ceramics; DC-DC power converters; Fabrication; Permittivity; Substrates; Temperature; Thick film inductors; Thick films;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2010 Twenty-Fifth Annual IEEE
Conference_Location :
Palm Springs, CA
Print_ISBN :
978-1-4244-4782-4
Electronic_ISBN :
1048-2334
DOI :
10.1109/APEC.2010.5433519
