LM4673

更新时间： 2024-11-22 23:16:47

品牌	Logo	应用领域
美国国家半导体 - NSC		放大器功率放大器
页数	文件大小	规格书
18页	887K
描述
Filterless, 2.65W, Mono, Class D Audio Power Amplifier

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LM4673 数据手册

December 2005

LM4673

Filterless, 2.65W, Mono, Class D Audio Power Amplifier

General Description

Key Specifications

The LM4673 is a single supply, high efficiency, 2.65W, mono,

Class D audio amplifier. A low noise, filterless PWM archi-

tecture eliminates the output filter, reducing external compo-

nent count, board area consumption, system cost, and sim-

plifying design.

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

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

Efficiency at 5V, 1W into 8Ω speaker

Quiescent current, 3.6V supply

Total shutdown power supply current

Single supply range

86% (typ)

2.1mA (typ)

0.01µA (typ)

2.4V to 5.5V

78dB

The LM4673 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.

PSRR, f = 217Hz

Features

The LM4673 has high efficiency with speaker loads com-

pared to a typical Class AB amplifier. With a 3.6V supply

driving an 8Ω speaker, the IC’s efficiency for a 100mW

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

n Mono Class D Operation

n No output filter required for inductive loads

n Externally configurable gain

n Very fast turn on time: 17µs (typ)

n Minimum external components

n "Click and pop" suppression circuitry

n Micro-power shutdown mode

The LM4673 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 LM4673 is externally configurable which

allows independent gain control from multiple sources by

summing the signals. Output short circuit and thermal over-

load protection prevent the device from damage during fault

conditions.

n Available in space-saving 0.4mm pitch micro SMD and

LLP^Tm(Future Product) packages

Applications

n Mobile phones

n PDAs

n Portable electronic devices

Typical Application

201522J3

FIGURE 1. Typical Audio Amplifier Application Circuit

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

DS201522

www.national.com

12 3 4 5 6 7...18

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与LM4673相关器件

型号	品牌	获取价格	描述	数据表
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
LM4673SD/NOPB	TI	获取价格	2.65W 单声道、模拟输入 D 类扬声器放大器 \| NGQ \| 8 \| -40 to 8
LM4673SDX	NSC	获取价格	IC 2.65 W, 1 CHANNEL, AUDIO AMPLIFIER, DSO8, LLP-8, Audio/Video Amplifier
LM4673TM	NSC	获取价格	Filterless, 2.65W, Mono, Class D Audio Power Amplifier
LM4673TM/NOPB	TI	获取价格	2.65W 单声道、模拟输入 D 类扬声器放大器 \| YFQ \| 9 \| -40 to 8
LM4673TMX	NSC	获取价格	暂无描述
LM4673TMX/NOPB	TI	获取价格	2.65W 单声道、模拟输入 D 类扬声器放大器 \| YFQ \| 9 \| -40 to 8
LM4674	NSC	获取价格	Filterless 2.5W Stereo Class D Audio Power Amplifier
LM4674	TI	获取价格	免滤波 2.5 立体声 D 类音频功率放大器

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