High-Performance Charge Pump Regulator with Integrated CMOS Voltage Sensing Control Circuit

This paper introduces a design for a charge pump DC-DC boost regulator with an integrated low-voltage control circuit. With a charge pump and feedback circuits implemented in 0.35 & mu;m CMOS technology, the proposed DC-DC boost regulator offers an efficient device solution for low-power applications. The proposed design employs an error amplifier, oscillator, and comparator in the control circuit which is designed with a supply voltage of 1.8-3.5 V and 2 MHz frequency. Stability is obtained via a pole-zero compensation in the feedback circuit. The charge pump regulator with four pump stages and the whole regulator circuit are analyzed using the Cadence simulation tool. Measurements of the fabricated 0.35 & mu;m CMOS regulator show that the transient time of the error amplifier is controlled within 1.0 & mu;sec and the output voltage is accurately controlled from 7.8 V to 9.4 V with 27-38 mV ripple and 4.5 mA maximum current.