LM4882 Datasheet, PDF (1/12 Pages) National Semiconductor (TI) – 250mW Audio Power Amplifier with Shutdown Mode

January 1998
LM4882
250mW Audio Power Amplifier with Shutdown Mode
General Description
The LM4882 is a single-ended audio power amplifier ca-
pable of delivering 250 mW of continuous average power
into an 8Ω load with 1% (THD + N) 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 LM4882 does not require bootstrap capacitors or
snubber networks, it is optimally suited for low-power por-
table systems.
The LM4882 features an externally controlled, low power
consumption shutdown mode which is virtually clickless and
popless, as well as an internal thermal shutdown protection
mechanism.
The unity-gain stable LM4882 can be configured by external
gain-setting resistors.
Key Specifications
n THD + N at 1 kHz at 250 mW
continuous average output
power into 8Ω
n Output Power at 1% THD + N
at 1kHz into 4Ω
n THD + N at 1 kHz at 85 mW
continuous average output
power into 32Ω
n Shutdown Current
1.0% (max)
380mW (typ)
0.1% (typ)
0.7 µA (typ)
Features
n MSOP surface mount packaging
n “Click and Pop” Suppression Circuitry
n Supply voltages from 2.4V–5.5V
n Operating Temperature −40˚C to 85˚C
n Unity-gain stable
n External gain configuration capability
n No bootstrap capacitors, or snubber circuits are
necessary
Applications
n Personal Computers
n Cellular Phones
n General Purpose Audio
Typical Application
Connection Diagram
MSOP and SOIC Package
DS100030-2
Top View
Order Number LM4882MM or LM4882M
See NS Package Number MUA08A or M08A
DS100030-1
*Refer to the Application Information Section for information concerning
proper selection of the input and output coupling capacitors.
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer^® is a registered trademark of National Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100030
www.national.com