LM4860 Datasheet, PDF (1/9 Pages) National Semiconductor (TI) – Series 1W Audio Power Amplifier with Shutdown Mode

August 1994
LM4860
Series 1W Audio Power Amplifier with Shutdown Mode
General Description
The LM4860 is a bridge-connected audio power amplifier ca-
pable 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 ex-
ternal monitoring.
The unity-gain stable LM4860 can be configured by external
gain setting resistors for differential gains of 1 to 10 without
the use of external compensation components.
Key Specifications
n THD+N at 1W continuous average
output power into 8Ω: 1% (max)
n Instantaneous peak output power: >2W
n Shutdown current: 0.6 µA (typ)
Features
n No output coupling capacitors, bootstrap capacitors, or
snubber circuits are necessary
n Small Outline (SO) power 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
DS011988-1
FIGURE 1. Typical Audio Amplifier Application Circuit
DS011988-2
Top View
Order Number LM4860M
See NS Package Number M16A
The Boomer^® registered trademark is licensed to National Semiconductor for audio integrated circuits by Rockford Corporation.
Patents pending.
© 1999 National Semiconductor Corporation DS011988
www.national.com