Santa Clara, Calif.--Aug. 26, 1997--National Semiconductor Corp. (Santa Clara, Calif.) introduced the latest addition to its line of high-quality stereo Boomer audio products--the LM4881 audio amplifier in a mini small outline package (MSOP).
Despite its tiny size, this new device typically generates 200mW (RL-8 ohms, THD=1 percent) of output power per channel in a single-ended output mode while consuming a minimal amount of supply current, making it ideal for portable audio systems. At 10 percent THD, it is capable of 300mW output into an 8 ohm load.
Designed to drive both speakers and headphones, the device operates from a 2.7V to 5.5V power supply and produces less than 0.2 percent total harmonic distortion plus noise (THD+N) when generating 75mW per channel as a headphone driver (RL=32 ohms).
Complementing the efficient operation of the LM4881 are several features which make it desirable for use in portable applications. During normal operation, the device draws only 3.6mA (typ) quiescent current. A power-saving shut-down/mute mode reduces consumption to 0.7uA (typ), extending the operating time of battery-powered systems.
The LM4881 operates without the aid of bootstrap capacitors or snubber networks. The product's ultra-small MSOP-8 footprint, combined with a minimal number of external components, greatly simplifies overall system design, saves board space and lowers manufacturing costs.
The LM4881 is currently available in MSOP, SOIC, and DIP. In quantities of 1,000, the LM4881MM (MSOP), LM4881M (SOP), and LM4881N (DIP) are all priced at $1.00.
Santa Clara, CA
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