The BA3528AFP and AB3529AFP have been developed for headphone stereos. They run off a 3V power supply, and include dual pre- and power amplifiers, and a motor governor.
The preamplifiers are direct-coupled, and the power amplifiers use a fixed-gain NF circuit. An on-chip VREF amplifier makes output coupling capacitors unnecessary, and the motor governor uses a bridge ratio system to minimize the external parts count and make reliable and compact designs possible.

FEATUREs
1) All the functions required for headphone stereo units on a single chip.
2) Preamplifier includes a mute amplifier.
3) Direct-coupled preamplifier.
4) No output coupling capacitors required for the power amplifiers.
5) Power amplifiers do not require oscillation prevention measures.
6) Power amplifier gain allows use of noise reduction (BA3529AFP).

APPLICATIONs
    3V portable stereo equipment