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 8

Ω load with 1% (THD + N) from a 5V power supply.

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+Nat1kHz at 250 mW

continuous average output

power into 8

Ω

1.0% (max)

n

Output Power at 1% THD+N

at 1kHz into 4

Ω

380mW (typ)

n

THD+Nat1kHz at 85 mW

continuous average output

power into 32

Ω

0.1% (typ)

n

Shutdown Current

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

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

MSOP and SOIC Package

DS100030-2

Top View

Order Number LM4882MM or LM4882M

See NS Package Number MUA08A or M08A

January 1998

© 1998 National Semiconductor Corporation

DS100030

www.national.com