High Performance Charge Pump Converter With Integrated Cmos Feedback Circuit

In this paper, an integrated low-voltage control circuit is introduced for a charge pump DC-DC boost converter. By exploiting the advantage of the integration of the feedback control circuit within CMOS technology, the charge pump boost converter offers a low-current operation with small ripple voltage. The error amplifier, comparator, and oscillator in the control circuit are designed with the supply voltage of 3.3 V and the operating frequency of 1.6 similar to 5.5 MHz. The charge pump converter with the 4 or 8 pump stages is measured in simulation. The test in the 0.35 mu m CMOS process shows that the load current and ripple ratio are controlled under 1 mA and 2% respectively. The output-voltage is obtained from 4.8 similar to 8.5 V with the supply voltage of 3.3 V.