Class AB audio amplifier package shrinks 30%

Santa Clara, Calif. — National Semiconductor Corp. today introduced a 1.3-watt mono Class AB Boomer audio amplifier that touts improved output power and a 30 percent package size reduction for hands-free cell phone use and ringer functions.

National's LM4995 amplifier is a housed in a 1.25 x 1.25 mm, 0.4 mm-pitch micro SMD package, which uses 30 percent less space on the printed-circuit board than existing audio amplifiers, the company said.

Operating on a single 5-volt supply, the LM4995 is capable of driving a 8-ohm speaker load at a continuous average output of 1.3 W with less than one percent total harmonic distortion plus noise (THD+N). The LM4995 amplifier offers a power supply rejection ratio (PSRR) of 74 dB at 217 Hz and a low quiescent power supply current of 1.6 milliamps.

The LM4995 does not require bootstrap capacitors or snubber circuits, which reduces the size as well as the number of external components needed, according to National. It features a low-power-consumption shutdown mode and an internal thermal shutdown protection mechanism, as well as advanced pop and click circuitry that eliminates output transients which would otherwise occur during power or shutdown cycles. The LM4995 is also unity-gain stable and has externally configurable gain using simple gain-setting resistors.

Developed by National, the 0.4-mm pitch micro SMD package is said to be the next generation of the industry-leading micro SMD packaging family that National originated in 1999. This new package utilizes advanced manufacturing processes for making silicon, bumping and back-grinding technologies. Manufacturers can use the package with conventional surface-mount handling equipment.

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Available now in a lead-free, 9-bump micro SMD package, the LM4995 is priced at 65 cents in 1,000-unit quantities. Click here for the LM4995 data sheet.

National Semiconductor Corp. , 1-800-272-9959,

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