LM4871MX 3W Mono Audio Amplifier with 2.7V-5.5V Low Voltage Operation Low Quiescent Current, Shutdown Mode Thermal Protection Improved RF Noise Immunity and Space-Saving SOIC Package

LM4871MX 3W Mono Audio Amplifier with 2.7V-5.5V Low Voltage Operation Low Quiescent Current, Shutdown Mode Thermal Protection Improved RF Noise Immunity and Space-Saving SOIC Package

FEATURES

• NoOutput Coupling Capacitors, Bootstrap 2 Capacitors, or Snubber Circuits Required

• Unity-gain Stable

• WSON,VSSOP, SOIC, or PDIP Packaging

• External Gain Configuration Capability

• PinCompatible with the LM4861

APPLICATIONS

• Portable Computers

• Desktop Computers

• LowVoltage Audio Systems

KEY SPECIFICATIONS

• POat10%THD+N, 1kHz

  – LM4871LD: 3Ω , 4Ω Loads; 3W (typ), 2.5 W (typ)

  – All other LM4871 Packages: 8Ω load 1.5 W (typ)

• Shutdown Current 0.6µA (typ)

• Supply Voltage Range 2.0V to 5.5 V

• THDat1kHz at 1W Continuous Average Output Power into 8Ω 0.5% (max)

DESCRIPTION

The LM4871 is a mono bridged audio power amplifier capable of delivering 3W of continuous average power into a 3Ω load with less than 10% THD when powered by a 5V power supply (see Note). To conserve power in portable applications, the LM4871's micropower shutdown mode (IQ = 0.6µA, typ) is activated when VDD is applied to the SHUTDOWN pin.

Boomer audio power amplifiers are designed specifically to provide high power, high fidelity audio output. They require few external components and operate on low supply voltages from 2.0V to 5.5V. Since the LM4871 does not require output coupling capacitors, bootstrap capacitors, snubber networks, it is ideally suited for low-power portable or systems that require minimum volume and weight.

Additional LM4871 features include thermal shutdown protection, unity-gain stability, and external gain set.

INFORMATION

Drawing

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