Date: 06/04/2009

Headphone amplifier IC with quiescent current of only 0.9 mA

National Semiconductor has launched a stereo headphone amplifier IC with quiescent current of 0.9 mA for any portable device with music play feature. If the quiescent current getting dropped in this way, the future smart phones and other media players may not need a battery recharge even for weeks.

This wonderful device called LM48824 uses Class G architecture which doubles the power-efficiency compared to typical Class AB headphone amplifiers. The noise created by ground mismatches is reduced by a trick called 'common-mode sensing' that corrects for signal differences between the amplifier ground and the headphone return terminal.

Other key features of LM48824 are,

The LM48824 includes a 32-step I2C compatible volume control with mute and delivers 37 mW per channel into a 16-Ohm load with less than one percent total harmonic distortion plus noise (THD+N) at 3.6V.

The LM48824 feature a power supply rejection ratio (PSRR) of 105 dB at 217 Hz

Package: 16-bump, 1.7 mm by 1.7 mm, 0.4 mm-pitch micro SMD package.
Availability: Now

Price: Each $1.06 in 1K pieces.