LM4671 Datasheet

IC型號(hào)：
LM4671
PDF描述：
Filterless High Efficiency 2.5W Switching Audio Amplifier
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LM4671 Filterless High Efficiency 2.5W Switching Audio Amplifier

March 2005

LM4671

Filterless High Efficiency 2.5W Switching Audio

Amplifier

General Description

The LM4671 is a single supply, high efficiency 2.5W switch-

ing audio amplifier. A low noise, filterless PWM architecture

eliminates the output filter, reducing external component

count, board area consumption, system cost, and simplifying

design.

The LM4671 is designed to meet the demands of mobile

phones and other portable communication devices. Operat-

ing on a single 5V supply, it is capable of driving a 4鈩?/div>

speaker load at a continuous average output of 2.1W with

less than 1% THD+N. Its flexible power supply requirements

allow operation from 2.4V to 5.5V.

The LM4671 has high efficiency with speaker loads com-

pared to a typical Class AB amplifier. With a 3V supply

driving an 8鈩?speaker, the IC鈥檚 efficiency for a 100mW

power level is 80%, reaching 88% at 400mW output power.

The LM4671 features a low-power consumption shutdown

mode. Shutdown may be enabled by driving the Shutdown

pin to a logic low (GND).

The gain of the LM4671 is externally configurable which

allows independent gain control from multiple sources by

summing the signals.

Key Specifications

Efficiency at 3.6V, 100mW into 8鈩?speaker 80% (typ)

Efficiency at 3.6V, 400mW into 8鈩?speaker 88% (typ)

Efficiency at 5V, 1W into 8鈩?speakerr

Quiescent current, 3.6V supply

Total shutdown power supply current

Single supply range

86% (typ)

2.8mA (typ)

0.01碌A(chǔ) (typ)

2.4V to 5.5V

Features

No output filter required for inductive loads

Externally configurable gain

Very fast turn on time: 1ms (typ)

Minimum external components

"Click and pop" suppression circuitry

Micro-power shutdown mode

Available in space-saving microSMD package

Applications

Mobile phones

PDAs

Portable electronic devices

Typical Application

201073J3

FIGURE 1. Typical Audio Amplifier Application Circuit

Boomer

廬

is a registered trademark of National Semiconductor Corporation.

漏 2005 National Semiconductor Corporation

DS201073

www.national.com

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