Stereo headphone amplifier

General Description:

The LM4910 is an audio power amplifier primarily designed for headphone applications in portable device applications. It is capable of delivering 35mW of continuous average power to a 32Ω load with less than 1% distortion (THD+N) from a 3.3VDC power supply. The LM4910 utilizes a new circuit topology that eliminates output coupling capacitors and half-supply bypass capaci-tors (patent pending). The LM4910 contains advanced pop & click circuitry which eliminates noises caused by transients that would otherwise occur during turn-on and turn-off. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. Since the LM4910 does not require any output coupling capacitors, half-supply bypass capaci-tors, or bootstrap capacitors, it is ideally suited for low-power tors, or bootstrap capacitors, it is ideally suited for low-power sumption are primary requirements.  Amplifier circuit

Features

• Eliminates headphone amplifier output coupling capacitors (patent pending)
• Eliminates half-supply bypass capacitor (patent pending)
• Advanced pop & click circuitry eliminates noises during turn-on and turn-off
• Ultra-low current shutdown mode
• Unity-gain stable
• 2.2V - 5.5V operation
• Available in space-saving MSOP and SOIC packages

Applications

• Mobile Phones
• PDAs
• Portable eletronics devices
• Portable MP3 players

Circuit diagram:

Stereo headphone amplifier

Amplifier circuit