LM4860 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.
output power into 8Ω: 1% (max)
n
Instantaneous peak output power:
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Shutdown current: 0.6 µA (typ)
>
2W
Features
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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
n
n
n
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Personal computers
Portable consumer products
Cellular phones
Self-powered speakers
Toys and games
Key Specifications
n
THD+N at 1W continuous average
Typical Application
Connection Diagram
Small Outline Package
DS011988-2
Top View
Order Number LM4860M
See NS Package Number M16A
DS011988-1
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.
© 1999 National Semiconductor Corporation
DS011988
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
