LM4876 Datasheet, PDF (1/9 Pages) National Semiconductor (TI) – 1.1W Audio Power Amplifier with Shutdown Logic Low

February 2000
LM4876
1.1W Audio Power Amplifier with Shutdown Logic Low
General Description
The LM4876 is a bridge-connected audio power amplifier ca-
pable of delivering typically 1.1W of continuous average
power to an 8Ω load with 0.5% (THD) from a 5V power sup-
ply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. Since the LM4876 does not require
output coupling capacitors, bootstrap capacitors, or snubber
networks, it is optionally suited for low-power portable sys-
tems.
The LM4876 features an externally controlled, low-power
consumption shutdown mode, which is achieved by driving
pin 1 with logic low. Additionally, the LM4876 features an in-
ternal thermal shutdown protection mechanism.
The LM4876 is unity-gain stable and can be configured by
external gain-setting resistors.
Key Specifications
n THD at 1 kHz at 1W continuous
average output power into 8Ω
n Output power at 10% THD+N
at 1 kHz into 8Ω
n Shutdown Current
0.5% (max)
1.5W (typ)
0.01 µA (typ)
Features
n No output coupling capacitors, bootstrap capacitors, or
snubber circuits are necessary
n Small Outline packaging
n Unity-gain stable
n External gain configuration capability
n Pin compatible with LM4861 and LM4871
Applications
n Mobile Phones
n Portable Computers
n Desktop Computers
n Low Voltage Audio Systems
Typical Application
Connection Diagram
Small Outline Package
DS101299-2
Top View
Order Number LM4876M
See NS Package Number M08A
DS101299-1
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer^® is a registered trademark of National Semiconductor Corporation.
© 2000 National Semiconductor Corporation DS101299
www.national.com