Title :
Switched capacitor DC-DC converter in 65nm CMOS technology with a peak efficiency of 97%
Author :
Santa, Thomas ; Auer, Mario ; Sandner, Christoph ; Lindholm, Christian
Author_Institution :
Inst. of Electron., Graz Univ. of Technol., Graz, Austria
Abstract :
This paper presents a highly efficient switched capacitor (SC) DC-DC converter, which is implemented in a 65nm low power CMOS process to enable SoC integration. The converter supplies a nominal output current of 30mA with an efficiency of 95%. The buck converter operates with a constant input voltage of 1.83V and produces an output voltage of 1.2V. The charge is transported in two phases from the input supply to the output capacitor. Therefore, a network consisting of switches and two so-called flying capacitors are used. This converter is intended to be used in power management units for mobile devices and to substitute complex and expensive inductor based DC-DC converters. A test chip was designed in collaboration with Infineon Technologies Austria AG. The measurement results are presented and give for an output current of 10mA a peak efficiency of 97%.
Keywords :
CMOS integrated circuits; DC-DC power convertors; capacitors; low-power electronics; switched capacitor networks; Infineon Technologies Austria AG; SoC integration; buck converter; current 10 mA; current 30 mA; efficiency 95 percent; efficiency 97 percent; expensive inductor based DC-DC converters; flying capacitors; low power CMOS process; mobile devices; power management units; size 65 nm; switched capacitor DC-DC converter; test chip; voltage 1.2 V; voltage 1.83 V; CMOS integrated circuits; CMOS technology; Capacitors; Driver circuits; Switches; Voltage control; Voltage measurement;
Conference_Titel :
Circuits and Systems (ISCAS), 2011 IEEE International Symposium on
Conference_Location :
Rio de Janeiro
Print_ISBN :
978-1-4244-9473-6
Electronic_ISBN :
0271-4302
DOI :
10.1109/ISCAS.2011.5937822
