Boomer Series: 1.1W Audio Amplifier with Shutdown Mode - LM4861


Boomer Series: 1.1W Audio Amplifier with Shutdown Mode


The LM4861 is a bridge-connected audio power amplifier capable of delivering 1.1W of continuous average power to an 8Ω load with 1% THD+N using a 5V power supply.

Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components using surface mount packaging. Since the LM4861 does not require output coupling capacitors, bootstrap capacitors, or snubber networks, it is optimally suited for low-power portable systems.

The LM4861 features an externally controlled, low-power consumption shutdown mode, as well as an internal thermal shutdown protection mechanism.

The unity-gain stable LM4861 can be configured by external gain-setting resistors for differential gains of up to 10 without the use of external compensation components. Higher gains may be achieved with suitable compensation.


  • No output coupling capacitors, bootstrap capacitors, or snubber circuits are necessary
  • Small Outline (SOIC) packaging
  • Compatible with PC power supplies
  • Thermal shutdown protection circuitry
  • Unity-gain stable
  • External gain configuration capability

Key Specifications

  • THD+N for 1kHz at 1W continuous average output power into 8Ω 1.0% (max)
  • Output power at 10% THD+N at 1kHz into 8Ω 1.5 W (typ)
  • Shutdown Current 0.6µA (typ)

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Parametrics Compare all products in Speaker Amplifier Class AB/Class D

Speaker Channels
Speaker Amp Type
Output Power (W)
Approx. Price (US$)
Operating Temperature Range (C)
0.69 | 1ku    
-40 to 85    

Related end equipment

  • Personal computers
  • Portable consumer products
  • Self-powered speakers
  • Toys and games

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