Datasheet > LM4664

LM4664

更新时间： 2024-11-25 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
14页	548K
描述
Filterless High Efficiency 1.1W Switching Audio Amplifier

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LM4664 数据手册

March 2004

LM4664

Filterless High Efficiency 1.1W Switching Audio

Amplifier

General Description

Key Specifications

The LM4664 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 parts count,

simplifies circuit design, and reduces board area. The

LM4664 processes analog inputs with a delta-sigma modu-

lation technique that lowers output noise and THD when

compared to conventional pulse width modulators.

Efficiency at 3V, 100mW into 8Ω transducer 74% (typ)

Efficiency at 3V, 425mW into 8Ω transducer 84% (typ)

Efficiency at 5V, 1W into 8Ω transducer

Total quiescent power supply current

Total shutdown power supply current

Single supply range

86% (typ)

3.5mA (typ)

0.4µA (typ)

2.7V to 5.5V

The LM4664 is designed to meet the demands of mobile

phones and other portable communication devices. Operat-

ing on a single 3V supply, it is capable of driving 8Ω trans-

ducer loads at a continuous average output of 425mW with

less than 1%THD+N. Its flexible power supply requirements

allow operation from 2.7V to 5.5V.

Features

n No output filter required for inductive transducers

n Selectable gain of 6dB or 12dB

n Very fast turn on time: 7ms (typ)

n Minimum external components

The LM4664 has high efficiency with an 8Ω transducer load

compared to a typical Class AB amplifier. With a 3V supply,

the IC’s efficiency for a 100mW power level is 74%, reaching

84% at 425mW output power.

n "Click and pop" suppression circuitry

n Micro-power shutdown mode

n Short circuit protection

The LM4664 features a low-power consumption shutdown

mode. Shutdown may be enabled by driving the Shutdown

pin to a logic low (GND).

n Available in space-saving micro SMD package

Applications

n Mobile phones

n PDAs

The LM4664 has fixed selectable gain of either 6dB or 12dB.

The LM4664 has short circuit protection against a short from

the outputs to V_DD, GND, or across the outputs.

n Portable electronic devices

Typical Application

200960G5

FIGURE 1. Typical Audio Amplifier Application Circuit

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

DS200960

www.national.com

12 3 4 5 6 7...14

中文翻译

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与LM4664相关器件

型号	品牌	获取价格	描述	数据表
LM4665	NSC	获取价格	Filterless High Efficiency 1W Switching Audio Amplifier
LM4665	TI	获取价格	具有可选增益的 1.4W 单声道、模拟输入 D 类音频放大器
LM4665ITL	NSC	获取价格	Filterless High Efficiency 1W Switching Audio Amplifier
LM4665ITL	ROCHESTER	获取价格	NATIONALâS AUDIO AMPLIFIER now featuring Ro
LM4665ITL/NOPB	TI	获取价格	具有可选增益的 1.4W 单声道、模拟输入 D 类音频放大器 \| YZR \| 9 \| -4
LM4665ITLX	ROCHESTER	获取价格	NATIONALâS AUDIO AMPLIFIER now featuring Ro
LM4665ITLX	NSC	获取价格	Filterless High Efficiency 1W Switching Audio Amplifier
LM4665ITLX/NOPB	NSC	获取价格	IC,AUDIO AMPLIFIER,SINGLE,BGA,9PIN,PLASTIC
LM4665ITLX/NOPB	TI	获取价格	IC,AUDIO AMPLIFIER,SINGLE,BGA,9PIN,PLASTIC
LM4665LD	NSC	获取价格	Filterless High Efficiency 1W Switching Audio Amplifier

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