LM4862 675 mW Audio Power Amplifier with Shutdown Mode
May 1997
LM4862
675 mW Audio Power Amplifier with Shutdown Mode
General Description
The LM4862 is a bridge-connected audio power amplifier ca-
pable of delivering typically 675 mW of continuous average
power to an 8Ω load with 1% (THD) 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. Since the LM4862 does not require
output coupling capacitors, bootstrap capacitors, or snubber
networks, it is optimally suited for low-power portable sys-
tems.
The LM4862 features an externally controlled, low-power
consumption shutdown mode, as well as an internal thermal
shutdown protection mechanism.
The unity-gain stable LM4862 can be configured by external
gain-setting resistors.
Key Specifications
n
THD at 500 mW continuous average
output power at 1 kHz into 8Ω
n
Output power at 10% THD+N at
1 kHz into 8Ω
n
Shutdown Current
1% (max)
825 mW (typ)
0.7 µA (typ)
Features
n
No output coupling capacitors, bootstrap capacitors or
snubber circuits are necessary
n
Small Outline or DIP packaging
n
Unity-gain stable
n
External gain configuration capability
n
Pin compatible with LM4861
Applications
n
Portable Computers
n
Cellular Phones
n
Toys and Games
Typical Application
Connection Diagram
Small Outline and DIP Package
DS012342-2
Top View
Order Number LM4862M, LM4862N
See NS Package Number M08A or N08E
DS012342-1
*Refer to the
Application Information
section for information
concerning proper selection of the input coupling capacitor.
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer
®
is a registered trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation
DS012342
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
