LM4876_03 Datasheet, PDF (1/12 Pages) National Semiconductor (TI) – 1.1W Audio Power Amplifier with Logic Low Shutdown

March 2003
LM4876
1.1W Audio Power Amplifier with Logic Low Shutdown
General Description
The LM4876 is a single 5V supply bridge-connected audio
power amplifier capable of delivering 1.1W (typ) of continu-
ous average power to an 8Ω load with 0.5% THD+N.
Like other audio amplifiers in the Boomer series, the LM4876
is designed specifically to provide high quality output power
with a minimal amount of external components. The LM4876
does not require output coupling capacitors, bootstrap ca-
pacitors, or snubber networks. It is perfectly suited for low-
power portable systems.
The LM4876 features an active low externally controlled,
micro-power shutdown mode. Additionally, the LM4876 fea-
tures an internal thermal shutdown protection mechanism.
For PCB space efficiency, the LM4876 is available in MSOP
and SO surface mount packages.
The unity-gain stable LM4876’s closed loop gain is set using
external resistors.
Key Specifications
j THD+N at 1kHz for 1W continuous
average output power into 8Ω
j Output power at 1kHz into 8Ω
with 10% THD+N
j Shutdown current
j Supply voltage range
0.5% (max)
1.5W (typ)
0.01µA (typ)
2.0V to 5.5V
Features
n Does not require output coupling capacitors, bootstrap
capacitors, or snubber circuits
n 10-pin MSOP and 8-pin SO packages
n Unity-gain stable
n External gain set
Applications
n Mobile Phones
n Portable Computers
n Desktop Computers
n Low-Voltage Audio Systems
Typical Application
10129901
FIGURE 1. Typical LM4876 Audio Amplifier Application Circuit.
Numbers in ( ) are specific to the 10-pin MSOP package
Boomer^® is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation DS101299
www.national.com