Dual-output capacitive DC-DC converter with power distribution regulator in 90 nm CMOS

A fully integrated Dual-Output capacitive DC-DC converter providing a total output power of 1 mW is presented. The converter realizes both a 2/3 and a 1/3 voltage conversion, from 1.2 V to respectively 0.755 V and 0.32 V. A hysteretic controller regulates both output voltages, independently of the power distribution between both outputs. It achieves an efficiency of 68.6 % for the nominal case, and a maximum efficiency of 75.3 %. The validity of the developed model and used design strategy were verified by a test chip implemented in a 90 nm bulk CMOS technology.