Audio solution offers over 5 times the power to micro speakers

Audio solution offers over 5 times the power to micro speakers

Claimed to boost the output power of micro speakers by over 5 times, the TFA9887 can safely deliver 2.6 W of output into a 4 Ω speaker that is nominally only rated for 0.5 W. The part consists of a high effciency class-D audio amplifier, an intelligent dc-to-dc converter, and an embedded DSP with a sophisticated speaker-boost and protection algorithm. The integrated dc/dc converter allows the system to deliver the power from a battery voltage of 3.6 V.

With a unique combination of safety features including adaptive excursion control and real-time temperature protection, the TFA9887 monitors speakers through a current-sensing amplifier and enables safe operation while working at near peak output at all times. The audio input interface is I2S and the control setting are communicated via an I2C-bus interface.

It optimizes the audio signal based on the movement of the speaker, something no other system is capable of, using the full capabilities of the speaker without pushing beyond the limits. An advanced clip avoidance algorithm monitors audio performance and prevents clipping, even when the power supply begins to sag.

The TFA9887 is available in a 29-bump WLCSP with a 400 µm pitch. (Contact company for pricing available now.)

By Christina Nickolas

NXP Semiconductors , Eindhoven , The Netherlands
Sales 408-434-3000
www.nxp.com