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This paper presents a dc-dc conversion system consisting of a switched-capacitor voltage tripler and a low-dropout regulator (LDO) for transcutaneous-powered cochlear implants. Break-before-make mechanism is developed in the tripler to improve the power efficiency and reduces the output glitch. The current-buffer compensated LDO as a post-regulator of the tripler not only removes the glitch from the tripler, but also maintains a constant and stable output voltage irrespective of the change in different load currents. The accuracy of the output voltage is thus significantly enhanced. In a standard 0.35-mum CMOS, results show that the proposed system can deliver up to 60 mA load current and achieve the peak power efficiency of 88%. The maximum output voltage variation is only 0.6% of the nominal output of 4.84 V under full load current change of 60 mA.
Date of Conference: 27-30 Nov. 2007