1FEATURES
2• 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

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

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)

DESCRIPTION
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.