Constant on-time DC-DC converter using ripple injection filter with inherent adaptive voltage positioning

Author

Miyazaki, Toshimasa ; Ogawa, Tomomi

Author_Institution

Center for Semicond. R&D, Toshiba Corp., Kawasaki, Japan

fYear

2014

fDate

16-20 March 2014

Firstpage

460

Lastpage

463

Abstract

A constant on-time DC-DC converter using ripple injection filter with inherent adaptive voltage positing function is proposed. By using the proposed filter, voltage positioning is realized without current-sensing mechanism and the droop voltage can be controlled by a resistor within the filter. The droop voltage is calculated and the filter design methodology to obtain optimal transient response is described. A test chip for 1-A, 3.6-V to 1.2-V DC-DC converter is fabricated using 0.25-μm CMOS process. The experimental results show that the line regulation of the designed DC-DC converter is 37mV/A which matches the calculation. With a load-current transient of 500mA, the designed DC-DC converter showed voltage disturbance of 15mV.

Keywords

CMOS integrated circuits; DC-DC power convertors; integrated circuit design; integrated circuit manufacture; integrated circuit technology; integrated circuit testing; power filters; resistors; CMOS process; constant on-time DC-DC converter; current 1 A; current 500 mA; current-sensing mechanism; droop voltage control; inherent adaptive voltage positioning function; load-current transient; resistor; ripple injection filter; size 0.25 mum; transient response; voltage 15 mV; voltage 3.6 V to 1.2 V; DC-DC converters; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Applied Power Electronics Conference and Exposition (APEC), 2014 Twenty-Ninth Annual IEEE

Conference_Location

Fort Worth, TX

Type

conf

DOI

10.1109/APEC.2014.6803348

Filename

6803348