LM4674

更新时间： 2024-11-15 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	842K
描述
Filterless 2.5W Stereo Class D Audio Power Amplifier

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LM4674 数据手册

December 2005

LM4674

Filterless 2.5W Stereo Class D Audio Power Amplifier

General Description

Key Specifications

The LM4674 is a single supply, high efficiency, 2.5W/

channel, filterless switching audio amplifier. A low noise

PWM architecture eliminates the output filter, reducing ex-

ternal component count, board area consumption, system

cost, and simplifying design.

Efficiency at 3.6V, 100mW into 8Ω

80% (typ)

85% (typ)

Efficiency at 3.6V, 500mW into 8Ω

Efficiency at 5V, 1W into 8Ω

Quiescent Power Supply Current

at 3.6V supply

The LM4674 is designed to meet the demands of mobile

phones and other portable communication devices. Operat-

ing from a single 5V supply, the device is capable of deliv-

ering 2.5W/channel of continuous output power to a 4Ω load

with less than 10% THD+N. Flexible power supply require-

ments allow operation from 2.4V to 5.5V.

4mA

Power Output at V_DD= 5V,

R_L= 4Ω, THD ≤ 10%

Power Output at V_DD= 5V,

R_L= 8Ω, THD ≤ 10%

Shutdown current

2.5W (typ)

1.5W (typ)

0.1µA (typ)

The LM4674 features high efficiency compared to conven-

tional Class AB amplifiers. When driving and 8Ω speaker

from a 3.6V supply, the device features 85% efficiency at P_O

= 500mW. Four gain options are pin selectable through the

GAIN0 and GAIN1 pins.

Features

n Output Short Circuit Protection

n Stereo Class D operation

n No output filter required

n Logic selectable gain

Output short circuit protection prevents the device from be-

ing damaged during fault conditions. Superior click and pop

suppression eliminates audible transients on power-up/down

and during shutdown. Independent left/right shutdown con-

trols maximizes power savings in mixed mono/stereo appli-

cations.

n Independent shutdown control

n Minimum external components

n Click and Pop suppression

n Micro-power shutdown

n Available in space-saving 2mm x 2mm x 0.6mm micro

SMD package

Applications

n Mobile phones

n PDAs

n Laptops

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

DS201674

www.national.com

12 3 4 5 6 7...18

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与LM4674相关器件

型号	品牌	获取价格	描述	数据表
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
LM4674SQ/NOPB	TI	获取价格	免滤波 2.5 立体声 D 类音频功率放大器 \| RGH \| 16 \| -40 to 85
LM4674SQX	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
LM4674SQX/NOPB	TI	获取价格	IC,AUDIO AMPLIFIER,DUAL,BGA,16PIN,PLASTIC

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