A 0.16mm<sup>2</sup> completely on-chip switched-capacitor DC-DC converter using digital capacitance modulation for LDO replacement in 45nm CMOS

Abstract

A completely on-chip switched-capacitor DC-DC converter that occupies 0.16 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> is implemented in a 45 nm CMOS process. The converter delivers 8 mA output current while maintaining load voltages from 0.8 to 1 V from a 1.8 V input supply. A digital capacitive modulation scheme is employed to maintain the converter efficiency between 50 to 70% over a wide range of load current levels.