LM4880

Dual 250 mW Audio Power Amplifier with Shutdown

Mode

General Description

The LM4880 is a dual audio power amplifier capable of deliv-

ering typically 250 mW per channel of continuous average

power to an 8

Ω load with 0.1% (THD) using 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 using surface mount packaging.

Since the LM4880 does not require bootstrap capacitors or

snubber networks, it is optimally suited for low-power por-

table systems.

The LM4880 features an externally controlled, low-power

consumption shutdown mode, as well as an internal thermal

shutdown protection mechanism.

The unity-gain stable LM4880 can be configured by external

gain-setting resistors.

Key Specifications

n THD at 1 kHz at 200 mW continuous average output

power into 8

Ω: 0.1% (max)

n THD at 1 kHz at 85 mW continuous average output

power into 32

Ω: 0.1% (typ)

n Output power at 10% THD+Nat1kHz into 8

Ω:

325 mW (typ)

n Shutdown Current:

0.7 µA (typ)

Features

n No bootstrap capacitors or snubber circuits are

necessary

n Small Outline (SO) and DIP packaging

n Unity-gain stable

n External gain configuration capability

Applications

n Headphone Amplifier

n Personal Computers

n CD-ROM Players

Typical Application

DS012343-1

FIGURE 1. Typical Audio Amplifier Application Circuit

November 1995

© 1999 National Semiconductor Corporation

DS012343

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