Miniaturized SiP supply board based on TPVD charge pump ICs for high-voltage biomedical applications

A miniaturized System-in-Package (SiP) high-voltage (HV) supply board (2.7 cm × 0.7cm) based on full-custom two-phase voltage doubler (TPVD) charge pump ICs connected in a 2-stage cascade configuration is presented. An accurate mathematical model has been used to set up and select the value of the charge pump IC design/application parameters in order to fullfil the output voltage and load current requirements. The model has been validated with two different HV integration technologies (I²T100 BCD 0.7 μm from ON semiconductor and 0.8 μm 5/20V CMOS-DMOS from DALSA semicoductor). The proposed HV supply board includes a skipping-based regulation system built with commercial discrete ICs that allows the generation of regulated fractional output voltage values different from the expected 2× factor per stage and improves the power efficiency of the whole system over a wide range of working loads (especially at lighter loads). Experimental results show that our system is capable to obtain different unregulated/regulated output voltages under several working load conditions ranging from 7.6 V @ 7.27 mA of load current (55.2 mW) to 12.98 V @ 150 μA (1.94 mW). The designed charge pump IC has been integrated using the high-voltage I²T100 0.7 μm BCD smart power technology.