A 0.6 V Input CCM/DCM Operating Digital Buck Converter in 40 nm CMOS

作者：Zhang Xin^*; Chen Po Hung; Okuma Yasuyuki; Ishida Koichi; Ryu Yoshikatsu; Watanabe Kazunori; Sakurai Takayasu; Takamiya Makoto

来源：IEEE Journal of Solid-State Circuits, 2014, 49(11): 2377-2386.

DOI：10.1109/JSSC.2014.2339325

• Buck converter
• DC-DC converter
• forward body bias
• low voltage
• voltage detector

This paper presents a 0.6 V input, 0.3-0.55 V output buck converter in 40 nm CMOS, for low-voltage low-power wireless sensor network systems. A low power CCM/DCM controller of the buck converter enables automatic selection of DCM or CCM operation depending on load situation, therefore improving the power efficiency. A dual-mode-body-biased (DMBB) zero-crossing detector with both forward body bias mode and zero body bias mode is designed to enable DCM operation with both low supply voltage and normal supply voltage. An ultra-low-power hysteresis voltage detector is proposed for body bias modes selection. The proposed buck converter achieves a peak efficiency of 94% with an output current range of 50 mu A to 10 mA. Thanks to the DCM operation, the efficiency at an output current of 10 mu A is improved by 20% and 9%, with an output voltage of 0.35 V and 0.5 V, respectively.

• 出版日期2014-11