Integrated on-chip 0.35m BiCMOS current-mode DC-DC buck converter

Chan Soo Lee, Nam Soo Kim, Munkhsuld Gendensuren, Jae Ho Choi, Joong Ho Choi

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


A current-mode DC-DC buck converter with a fully integrated power module is presented in this article. The converter is implemented using BiCMOS technology in amplifier and power MOSFET in a current sensor. The current sensor is realised by the power lateral double-diffused MOSFET with the aspect ratio much larger than that of a matched p-MOSFET. In addition, BiCMOS technology is applied in the error amplifier for an accurate current sensing and a fast transient response. The DC-DC converter is fabricated with 0.35m BiCMOS process. Experimental results show that the fully integrated converter operates at 1.3MHz switching frequency with a supply voltage of 5V. The output DC voltage is obtained as expected and the output ripple is controlled to be within 2% with a 30H off-chip inductor and 100F off-chip capacitor.

Original languageEnglish
Pages (from-to)1623-1634
Number of pages12
JournalInternational Journal of Electronics
Issue number12
StatePublished - 1 Dec 2012


  • BiCMOS
  • buck converter
  • current mode
  • fully integrated
  • output ripple


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