LM4670

更新时间： 2024-11-22 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	1077K
描述
Filterless High Efficiency 3W Switching Audio Amplifier

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LM4670 数据手册

December 2004

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...18

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与LM4670相关器件

型号	品牌	获取价格	描述	数据表
LM4670_06	NSC	获取价格	Filterless High Efficiency 3W Switching Audio Amplifier
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

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