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Cross-Regulation-Suppression control scheme for CCM Single-Inductor-Dual-Output buck converter with ordered-power-distributive control

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2 Author(s)
Cheng Huang ; Dept. of Electron. & Comput. Eng., Hong Kong Univ. of Sci. & Technol., Hong Kong, China ; Mok, P.K.T.

A Single-Inductor-Dual-Output (SIDO) buck converter with Cross-Regulation-Suppression (CRS) control scheme is presented. The converter operates in continuous-conduction-mode (CCM) and employs ordered-power-distributive control (OPDC) to distribute the inductor current to the two outputs. The novel CRS control method is used to suppress the cross-regulation (CR) of the SIDO which is an important issue in OPDC CCM converter design. On-chip type-III compensator is incorporated in the SIDO converter to eliminate off-chip components and accelerate system response. The CRS controlled converter is fabricated with AMS 0.35μm CMOS process and operates at 2MHz. Measurement results show that this converter achieves a cross-regulation down to 0.056mV/mA with 180mA load current changes and a response time less than 20μs. The maximum efficiency is 91.8%.

Published in:

Circuits and Systems (ISCAS), 2011 IEEE International Symposium on

Date of Conference:

15-18 May 2011