LM4671

更新时间： 2024-11-15 22:51:51

品牌	Logo	应用领域
美国国家半导体 - NSC		开关音频放大器
页数	文件大小	规格书
18页	966K
描述
Filterless High Efficiency 2.5W Switching Audio Amplifier

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LM4671 数据手册

March 2005

LM4671

Filterless High Efficiency 2.5W Switching Audio

Amplifier

General Description

Key Specifications

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.

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

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

Efficiency at 5V, 1W into 8Ω speakerr

Quiescent current, 3.6V supply

Total shutdown power supply current

Single supply range

86% (typ)

2.8mA (typ)

0.01µA (typ)

2.4V to 5.5V

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 4Ω

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.

Features

n No output filter required for inductive loads

n Externally configurable gain

n Very fast turn on time: 1ms (typ)

n Minimum external components

n "Click and pop" suppression circuitry

n Micro-power shutdown mode

The LM4671 has high efficiency with speaker loads com-

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

driving an 8Ω speaker, the IC’s 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).

n Available in space-saving microSMD package

The gain of the LM4671 is externally configurable which

allows independent gain control from multiple sources by

summing the signals.

Applications

n Mobile phones

n PDAs

n Portable electronic devices

Typical Application

201073J3

FIGURE 1. Typical Audio Amplifier Application Circuit

Boomer^®is a registered trademark of National Semiconductor Corporation.

DS201073

www.national.com

12 3 4 5 6 7...18

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与LM4671相关器件

型号	品牌	获取价格	描述	数据表
LM4671_07	NSC	获取价格	Filterless High Efficiency 2.5W Switching Audio Amplifier
LM4671_08	NSC	获取价格	Filterless High Efficiency 2.5W Switching Audio Amplifier
LM4671ITL	NSC	获取价格	Filterless High Efficiency 2.5W Switching Audio Amplifier
LM4671ITL/NOPB	NSC	获取价格	IC 2.5 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9, MICRO, SMD-9, Audio/Video Amplifier
LM4671ITLX	NSC	获取价格	Filterless High Efficiency 2.5W Switching Audio Amplifier
LM4671ITLX/NOPB	NSC	获取价格	IC 2.5 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9, MICRO, SMD-9, Audio/Video Amplifier
LM4673	NSC	获取价格	Filterless, 2.65W, Mono, Class D Audio Power Amplifier
LM4673	TI	获取价格	2.65W 单声道、模拟输入 D 类扬声器放大器
LM4673_07	NSC	获取价格	Filterless, 2.65W, Mono, Class D Audio Power Amplifier
LM4673SD	NSC	获取价格	Filterless, 2.65W, Mono, Class D Audio Power Amplifier

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