2W mono class G audio amplifier based on NS4733

Functional Description

NS4733 is a mono class G audio power amplifier with integrated boost charge pump power supply. The output swing of the amplifier is much larger than that of traditional amplifiers before being clipped. At 4.2V supply voltage, the output power of driving 8Ω load can reach 2W.

NS4733 is a mono Class G audio power amplifier with NCN function. NS4733 uses advanced technology to improve the efficiency of the amplifier. In addition, the chip integrates circuits to suppress clicks, crackles and other noises when switching on and off. It has built-in overcurrent protection, overheat protection and undervoltage protection. It is very suitable for applications with low power supply voltage but high output power requirements.

NS4733 is available in TQFN3×3-20 package and rated for operation in the temperature range of -40℃ to 85℃.

Key Features

• Integrated boost charge pump power supply

• Noise Crack Prevention (NCN) function

• Operating voltage range: 2.7V～4.5V

• Output power: 2.0W (4.2V power supply, 8Ω load)

• High PSRR: -70dB (217Hz)

• Low quiescent current (10mA)

• "Power-on, power-off" noise suppression

• Overcurrent protection, overheat protection, undervoltage protection

• TQFN3×3-20 package

Application Areas

• Mobile phone (cell phone, etc.)

• MP3/PMP

• Mini Speaker