Audio Power Amplifier
Tue, 07/17/2007 - 9:05am
National Semiconductor Corporation introduces a single-chip Boomer® audio power amplifier that delivers high voltage for driving ceramic speakers used in a wide range of 3 V portable devices. Driving the ceramic speaker at higher voltages allows it to produce a higher sound-pressure level (SPL) for applications that require louder sound. The LM48555 drives ceramic speakers in cell phones, smartphones, notebook computers and other small handheld devices. With a ceramic speaker load equivalent to 1 µF + 20W, the LM48555 provides a voltage drive of 15.7 V peak-to-peak with less than 1% total harmonic distortion plus noise (THD+N). In addition, the LM48555’s 12-bump micro SMD package has a footprint of 1.5 to 2.0 mm, making it possible for manufacturers to create ultra-thin, feature-rich handsets.