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NATIONAL PROVIDES ONLY LOW-VOLTAGE STEREO AUDIO POWER AMPLIFIER FOR DRIVING BOTH SPEAKER AND HEADPHONE SYSTEMS

Typical Power 325mW/Channel (THD+N = 10%, R(sub)L=8ohms)

THD+N greater than or = 0.1% at 250mW Per Channel(R(sub)L=8ohms) & 85mW Per Channel (R(sub)L=32ohms)

Power Saving Shutdown Mode Lowers Consumption to 0.7microA

Minimal Number of External Components Reduces Cost and Space

Nov 28, 1995

SANTA CLARA, CA., November 28, 1995 - Designed as a high-quality stereo audio amplifier to drive both speaker and headphone systems, the LM4880 is the latest addition to National Semiconductor's line of Boomer® audio amplifiers. This new device is capable of generating up to 325mW of output power per channel in a single-ended output mode while consuming a minimal amount of supply current. The LM4880 operates on either a 3V or 5V power supply and produces less than 0.1% total harmonic distortion plus noise (THD+N) when generating 250mW per channel as a speaker driver or 85mW per channel as a headphone driver.

Complementing the efficient operation of the LM4880 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 0.7microA (typ), extending the operating time of battery-powered systems. In addition, like all of National's Boomer audio amplifiers, the LM4880 operates without the aid of bootstrap capacitors or snubber networks. This minimal number of external components, combined with the product's small 8-pin footprint, simplifies overall system design, saving board space while lowering manufacturing costs. This combination of features makes the LM4880 ideal for use as a speaker driver for PC audio systems and as a headphone driver in external CD-ROM drives and mini-component systems.