1FEATURES
2• No Output Coupling Capacitors, Bootstrap
Capacitors, or Snubber Circuits are Necessary
• Small Outline (SO) Packaging
• Compatible with PC Power Supplies
• Thermal Shutdown Protection Circuitry
• Unity-Gain Stable
• External Gain Configuration Capability
• Two Headphone Control Inputs and
Headphone Sensing Output

APPLICATIONS
• Personal Computers
• Portable Consumer Products
• Cellular Phones
• Self-Powered Speakers
• Toys and Games

KEY SPECIFICATIONS
• THD+N at 1W Continuous Average
• Output Power into 8Ω: 1% (Max)
• Instantaneous Peak Output Power: > 2 W
• Shutdown Current: 0.6 μA (typ)

DESCRIPTION
The LM4860 is a bridge-connected audio power
amplifier capable of delivering 1W of continuous
average power to an 8Ω load with less than 1%
THD+N over the audio spectrum from 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 LM4860 does
not require output coupling capacitors, bootstrap
capacitors or snubber networks, it is optimally suited
for low-power portable systems.
The LM4860 features an externally controlled, low-
power consumption shutdown mode, as well as an
internal thermal shutdown protection mechanism. It
also includes two headphone control inputs and a headphone sense output for external monitoring.
The unity-gain stable LM4860 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.