1.1-W, mono, analog input Class-AB audio amplifier


Product details


Audio input type Analog Input Architecture Class-AB Speaker channels (Max) Mono Power stage supply (Max) (V) 5.5 Power stage supply (Min) (V) 2 Load (Min) (ohms) 8 Output power (W) 1.6 THD + N @ 1 kHz (%) 0.72 Iq (Typ) (mA) 6.5 Control interface Hardware Closed/open loop Closed Analog supply (Min) (V) 2 Analog supply (Max) (V) 5.5 PSRR (dB) 65 Operating temperature range (C) -40 to 85 open-in-new Find other Speaker amps

Package | Pins | Size

SOIC (D) 8 19 mm² 4.9 x 3.9 open-in-new Find other Speaker amps


  • 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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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.

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Technical documentation

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* Data sheet LM4861 1.1W Audio Power Amplifier with Shutdown Mode datasheet (Rev. C) May 02, 2013

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