Datasheet > LM4670_06

LM4670_06

更新时间： 2024-11-26 04:20:07

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
20页	1188K
描述
Filterless High Efficiency 3W Switching Audio Amplifier

阅读下载

中文翻译

获取价格

数据手册

如果您发现信息不准确，欢迎纠错

LM4670_06 数据手册

July 2006

LM4670

Filterless High Efficiency 3W Switching Audio Amplifier

General Description

Key Specifications

The LM4670 is a fully integrated single-supply high efficiency

switching audio amplifier. It features an innovative modulator

that eliminates the LC output filter used with typical switching

amplifiers. Eliminating the output filter reduces external com-

ponent count, simplifies circuit design, and reduces board

area. The LM4670 processes analog inputs with a delta-

sigma modulation technique that lowers output noise and

THD when compared to conventional pulse width modula-

tors.

Efficiency at 3.6V, 100mW into 8Ω speaker 77% (typ)

Efficiency at 3.6V, 600mW into 8Ω speaker 88% (typ)

Efficiency at 5V, 1W into 8Ω speaker

Quiescent current, 3.6V supply

Total shutdown power supply current

Single supply range

87% (typ)

4.8mA (typ)

0.01µA (typ)

2.4V to 5.5V

The LM4670 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 2.3W 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: 1.35ms (typ)

n Minimum external components

n "Click and pop" suppression circuitry

n Micro-power shutdown mode

n Short circuit protection

The LM4670 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 77%, reaching 88% at 600mW output power.

n Available in space-saving microSMD and LLP packages

The LM4670 features a low-power consumption shutdown

mode. Shutdown may be enabled by driving the Shutdown

pin to a logic low (GND).

Applications

n Mobile phones

n PDAs

The gain of the LM4670 is externally configurable which

allows independent gain control from multiple sources by

summing the signals.

n Portable electronic devices

Typical Application

20089901

FIGURE 1. Typical Audio Amplifier Application Circuit

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

DS200899

www.national.com

12 3 4 5 6 7...20

中文翻译

下载PDF

与LM4670_06相关器件

型号	品牌	获取价格	描述	数据表
LM4670ITL	TI	获取价格	LM4670 Boomer Audio Power Amplifier Series Filterless High
LM4670ITL	NSC	获取价格	Filterless High Efficiency 3W Switching Audio Amplifier
LM4670ITL/NOPB	NSC	获取价格	IC 3 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA9, MICRO, SMD-9, Audio/Video Amplifier
LM4670ITL/NOPB	TI	获取价格	LM4670 Boomerâ¢ Audio Power Amplifier Series
LM4670ITLX	TI	获取价格	LM4670 Boomer Audio Power Amplifier Series Filterless High
LM4670ITLX	NSC	获取价格	Filterless High Efficiency 3W Switching Audio Amplifier
LM4670SD	NSC	获取价格	Filterless High Efficiency 3W Switching Audio Amplifier
LM4670SD	TI	获取价格	LM4670 Boomer Audio Power Amplifier Series Filterless High
LM4670SDX	NSC	获取价格	IC 3 W, 1 CHANNEL, AUDIO AMPLIFIER, PDSO8, LLP-8, Audio/Video Amplifier
LM4670SDX/NOPB	TI	获取价格	IC,AUDIO AMPLIFIER,SINGLE,LLCC,8PIN,PLASTIC

与LM4670_06相关文章

解析光耦仿真器：升级光耦合器技术的必要性
2024-11-18

45
英伟达新一代Blackwell GPU过热问题致交付延迟
2024-11-18

34
国产厂商思特威CMOS图像传感器芯片单月出货超1亿颗，技术创新引领行业发展
2024-11-14

62
台积电5nm和3nm产能利用率达100%，半导体行业景气度持续攀升
2024-11-14

59

产品中心

服务支持

精选活动

关于我们

帮助中心

LM4670_06

LM4670_06 数据手册

与LM4670_06相关器件

与LM4670_06相关文章

您还可以找

产品中心

服务支持

精选活动

关于我们

帮助中心

LM4670_06

LM4670_06 数据手册

与LM4670_06相关器件

与LM4670_06相关文章

您还可以找

您在本页遇到什么问题？