Maxim Integrated Products introduces the MAX9788, a mono, class G amplifier specifically designed to drive the high capacitive load of piezoelectric loudspeakers. One of the main attractions for using ceramic piezoelectric speakers is their thin form factor. But to maintain the advantage of the ceramic speaker, the amplifier must also provide a compact solution. Since battery life is, moreover, one of the most important design criteria in mobile phone design, amplifier efficiency is also essential for an optimal audio solution. Responding to these design challenges, the MAX9788 uses novel technology to provide an efficient, compact solution for powering ceramic speakers. The MAX9788 integrates an inverting charge-pump power supply, which provides up to 16 Vp-p voltage drive from a single lithium ion (Li+) battery.