LM4673TMX

更新时间： 2024-11-26 13:01:07

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
24页	9135K
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LM4673TMX 数据手册

November 1, 2007

LM4673ꢀ

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 architec-

ture eliminates the output filter, reducing external component

count, board area consumption, system cost, and simplifying

design.

■ꢀ

Efficiency at 3.6V, 400mW into 8Ω speaker

88% (typ)

80% (typ)

■ꢀ

Efficiency at 3.6V, 100mW into 8Ω speaker

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 op-

eration from 2.4V to 5.5V.

■ꢀ

Efficiency at 5V, 1W into 8Ω speaker

86% (typ)

■ꢀQuiescent current, 3.6V supply

2.1mA (typ)

■ꢀ

0.01µA (typ)

Total shutdown power supply current

The LM4673 has high efficiency with speaker loads compared

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.

2.4V to 5.5V

78dB

■ꢀSingle supply range

■ꢀPSRR, f = 217Hz

The LM4673 features a low-power consumption shutdown

mode. Shutdown may be enabled by driving the Shutdown

pin to a logic low (GND).

Features

Mono Class D Operation

■

No output filter required for inductive loads

The gain of the LM4673 is externally configurable which al-

lows independent gain control from multiple sources by sum-

ming the signals. Output short circuit and thermal overload

protection prevent the device from damage during fault con-

ditions.

Externally configurable gain

Very fast turn on time: 17μs (typ)

Minimum external components

"Click and pop" suppression circuitry

Micro-power shutdown mode

■

Available in space-saving 0.4mm pitch micro SMD and

LLP^Tmpackages

Applications

Mobile phones

■

PDAs

Portable electronic devices

Boomer® is a registered trademark of National Semiconductor Corporation.

201522

www.national.com

12 3 4 5 6 7...24

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与LM4673TMX相关器件

型号	品牌	获取价格	描述	数据表
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
LM4674A	NSC	获取价格	Filterless 2.5W Stereo Class D Audio Power Amplifier
LM4674A	TI	获取价格	免滤波 2.5 立体声 D 类音频功率放大器
LM4674ATL	NSC	获取价格	Filterless 2.5W Stereo Class D Audio Power Amplifier
LM4674ATL/NOPB	TI	获取价格	免滤波 2.5 立体声 D 类音频功率放大器 \| YZR \| 16 \| -40 to 85
LM4674ATLX/NOPB	NSC	获取价格	IC 2.5 W, 2 CHANNEL, AUDIO AMPLIFIER, PBGA16, 2 X 2 MM, 0.60 MM HEIGHT, ROHS COMPLIANT, BG
LM4674ATLX/NOPB	TI	获取价格	免滤波 2.5 立体声 D 类音频功率放大器 \| YZR \| 16 \| -40 to 85
LM4674SQ	NSC	获取价格	IC 2.5 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC16, 4 X 4 MM, 0.80 MM HEIGHT, LLP-16, Audio/Video

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