LM4860_00 Datasheet, PDF (1/11 Pages) National Semiconductor (TI) – Series 1W Audio Power Amplifier with Shutdown Mode

August 2000
LM4860
Series 1W Audio Power Amplifier with Shutdown Mode
General 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 head-
phone 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.
Key Specifications
n THD+N at 1W continuous average
output power into 8Ω: 1% (max)
n Instantaneous peak output power: >2W
n Shutdown current: 0.6µA (typ)
Features
n No output coupling capacitors, bootstrap capacitors, or
snubber circuits are necessary
n Small Outline (SO) packaging
n Compatible with PC power supplies
n Thermal shutdown protection circuitry
n Unity-gain stable
n External gain configuration capability
n Two headphone control inputs and headphone sensing
output
Applications
n Personal computers
n Portable consumer products
n Cellular phones
n Self-powered speakers
n Toys and games
Typical Application
Connection Diagram
Small Outline Package
01198802
Top View
Order Number LM4860M
See NS Package Number M16A
01198801
FIGURE 1. Typical Audio Amplifier Application Circuit
The Boomer^® registered trademark is licensed to National Semiconductor for audio integrated circuits by Rockford Corporation.
Patents pending.
© 2004 National Semiconductor Corporation DS011988
www.national.com