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National unveils constant output Class D audio amplifier

Santa Clara, Calif. —National Semiconductor Corp. has introduced the first product in a new line of Boomer Class D audio amplifiers with integrated converter technology that eliminates the need for an external boost converter. The LM48510 enables manufacturers to design portable products that are able to operate at constant high-level output power even as batteries deplete to lower voltages.

National's LM48510 is capable of creating 1.2W of continuous power to an 8-Ohm speaker from a 3V input voltage. The amplifier drives a 4-Ohm speaker load at a continuous output power of 1.7W with less than 1 percent total harmonic distortion plus noise (THD+N).

The Boomer amplifier features a low-power consumption shutdown mode as well as output short-circuit and thermal overload protection. Advanced pop-and-click circuitry eliminates output transients, which would otherwise occur during power or shutdown cycles. The LM48510 is externally configurable for independent gain control from multiple sources.

National's LM48510 is available in a 0.5 mm-pitch, 16-pin LLP package, making it
well-suited for portable global positioning systems (GPS), wireless handsets, portable media players, medical equipment, voice-prompted fire alarms and a broad range of other battery-powered applications.

The LM48510 is priced at $1.35 in 1,000-unit quantities.

A datasheet and easy-to-order samples are available by clicking here.

National Semiconductor Corp., 1-408-721-5000, www.national.com

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