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.