LM4860| Datasheet

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LM4860 1W Audio Power Amplifier with Shutdown Mode

August 2000

LM4860 Series 1W Audio Power Amplifier with Shutdown Mode
General Description
The LM4860 is a bridge-connected audio power amplifier capable of delivering 1W of continuous average power to an 8 load with less than 1% THD+N over the audio spectrum 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 LM4860 does not require output coupling capacitors, bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems. The LM4860 features an externally controlled, low-power consumption shutdown mode, as well as an internal thermal shutdown protection mechanism. It also includes two headphone control inputs and a headphone sense output for external monitoring. The unity-gain stable LM4860 can be configured by external gain setting resistors for differential gains of up to 10 without the use of external compensation components. Higher gains may be achieved with suitable compensation.

Key Specifications
n THD+N at 1W continuous average output power into 8: 1% (max) n Instantaneous peak output power: > 2W n Shutdown current: 0.6uA (typ)

Features
n No output coupling capacitors, bootstrap capacitors, or snubber circuits are necessary n Small Outline (SO) packaging n Compatible with PC power supplies n Thermal shutdown protection circuitry n Unity-gain stable n External gain configuration capability n Two headphone control inputs and headphone sensing output

Applications
n n n n n Personal computers Portable consumer products Cellular phones Self-powered speakers Toys and games

Typical Application

Connection Diagram
Small Outline Package

01198802

Top View Order Number LM4860M See NS Package Number M16A

01198801

FIGURE 1. Typical Audio Amplifier Application Circuit

The Boomer registered trademark is licensed to National Semiconductor for audio integrated circuits by Rockford Corporation. Patents pending.

2004 National Semiconductor Corporation

DS011988

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